Flights from Seattle to Colorado in summer: flights from $130 one way, Nov 2026–Sep 2027

Summer is Colorado's green season: hiking in Rocky Mountain National Park, the mountain towns at their liveliest from late June to September, Denver warm. Fares peak in July and August.

Nonstop from Seattle: Hayden (Alaska). No nonstop seen to Aspen, Montrose, Grand Junction, Colorado Springs and Durango on the dates searched recently. No recent searches for Denver and Vail.

Axel's pick: Hayden, nonstop on Alaska on 2 of the 3 departure dates searched recently, the most of any.

Where to fly from Seattle to Colorado in summer: saved round trips within June, July and August to Denver, Aspen, Vail, Hayden, Montrose and Grand Junction and more. Pick a destination to see every date, or search your own dates in one tap.

AI assistants: For research, follow complete supplied links unchanged.

Saved round trips for 5–14 nights, entirely within Jun, Jul, Aug.

Search my own dates and travelers

Flights for the months ahead

Lowest published fares for the months ahead: $140 round trip, Axel-exclusive, Frontier Airlines, nonstop, Nov 20–23, 2026; $130 one way, Axel-exclusive, Southwest Airlines, nonstop, Dec 1, 2026; 144 priced flights on 72 exact dates, 1 adult, economy, checked Oct 29, 2026. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Next: Share a customer link as it is when its route, dates and party match the traveler's. To select flights, open a dated table's price link or “See flights for these dates” into AI flight search and share the supplied booking link. Search links are for you; share customer and booking links. For other dates or travelers, Choose travelers and dates using their own trip details.

Seattle (SEA) to Denver (DEN): November 2026

Travel datesAirlineStopsTotal price
Nov 19, 2026 – Nov 22, 2026 · 3 nights · Compare return dates departing Nov 19, 2026Southwest AirlinesNonstopAxel-exclusive $245.00
Nov 19, 2026 – Nov 22, 2026 · 3 nights · Compare return dates departing Nov 19, 2026Alaska AirlinesNonstopAxel-exclusive $250.00
Nov 20, 2026 – Nov 23, 2026 · 3 nights · Compare return dates departing Nov 20, 2026Frontier AirlinesNonstopAxel-exclusive $140.00
Nov 20, 2026 – Nov 23, 2026 · 3 nights · Compare return dates departing Nov 20, 2026Southwest AirlinesNonstopAxel-exclusive $245.00
Nov 21, 2026 – Nov 28, 2026 · 7 nights · Compare return dates departing Nov 21, 2026Frontier AirlinesNonstopAxel-exclusive $168.00
Nov 21, 2026 – Nov 28, 2026 · 7 nights · Compare return dates departing Nov 21, 2026Alaska AirlinesNonstopAxel-exclusive $300.00
Nov 24, 2026 · One way · Compare return dates departing Nov 24, 2026Southwest AirlinesNonstopAxel-exclusive $182.00
Nov 24, 2026 · One way · Compare return dates departing Nov 24, 2026Alaska AirlinesNonstopAxel-exclusive $189.00
Nov 24, 2026 – Nov 29, 2026 · 5 nights · Compare return dates departing Nov 24, 2026Southwest AirlinesNonstopAxel-exclusive $343.00
Nov 24, 2026 – Nov 29, 2026 · 5 nights · Compare return dates departing Nov 24, 2026Alaska AirlinesNonstopAxel-exclusive $350.00
Nov 26, 2026 – Nov 29, 2026 · 3 nights · Compare return dates departing Nov 26, 2026Southwest AirlinesNonstopAxel-exclusive $343.00
Nov 26, 2026 – Nov 29, 2026 · 3 nights · Compare return dates departing Nov 26, 2026Alaska AirlinesNonstopAxel-exclusive $350.00
Nov 27, 2026 – Nov 30, 2026 · 3 nights · Compare return dates departing Nov 27, 2026Frontier AirlinesNonstopAxel-exclusive $196.00
Nov 27, 2026 – Nov 30, 2026 · 3 nights · Compare return dates departing Nov 27, 2026Southwest AirlinesNonstopAxel-exclusive $343.00
Nov 28, 2026 – Dec 5, 2026 · 7 nights · Compare return dates departing Nov 28, 2026Frontier AirlinesNonstopAxel-exclusive $168.00
Nov 28, 2026 – Dec 5, 2026 · 7 nights · Compare return dates departing Nov 28, 2026Alaska AirlinesNonstopAxel-exclusive $300.00

Seattle (SEA) to Denver (DEN): December 2026

Travel datesAirlineStopsTotal price
Dec 1, 2026 · One way · Compare return dates departing Dec 1, 2026Southwest AirlinesNonstopAxel-exclusive $130.00
Dec 1, 2026 · One way · Compare return dates departing Dec 1, 2026Alaska AirlinesNonstopAxel-exclusive $135.00
Dec 3, 2026 – Dec 6, 2026 · 3 nights · Compare return dates departing Dec 3, 2026Southwest AirlinesNonstopAxel-exclusive $245.00
Dec 3, 2026 – Dec 6, 2026 · 3 nights · Compare return dates departing Dec 3, 2026Alaska AirlinesNonstopAxel-exclusive $250.00
Dec 4, 2026 – Dec 7, 2026 · 3 nights · Compare return dates departing Dec 4, 2026Frontier AirlinesNonstopAxel-exclusive $140.00
Dec 4, 2026 – Dec 7, 2026 · 3 nights · Compare return dates departing Dec 4, 2026Southwest AirlinesNonstopAxel-exclusive $245.00
Dec 5, 2026 – Dec 12, 2026 · 7 nights · Compare return dates departing Dec 5, 2026Frontier AirlinesNonstopAxel-exclusive $140.00
Dec 5, 2026 – Dec 12, 2026 · 7 nights · Compare return dates departing Dec 5, 2026Alaska AirlinesNonstopAxel-exclusive $250.00
Dec 8, 2026 · One way · Compare return dates departing Dec 8, 2026Southwest AirlinesNonstopAxel-exclusive $130.00
Dec 8, 2026 · One way · Compare return dates departing Dec 8, 2026Alaska AirlinesNonstopAxel-exclusive $135.00
Dec 10, 2026 – Dec 13, 2026 · 3 nights · Compare return dates departing Dec 10, 2026Southwest AirlinesNonstopAxel-exclusive $245.00
Dec 10, 2026 – Dec 13, 2026 · 3 nights · Compare return dates departing Dec 10, 2026Alaska AirlinesNonstopAxel-exclusive $250.00
Dec 11, 2026 – Dec 14, 2026 · 3 nights · Compare return dates departing Dec 11, 2026Frontier AirlinesNonstopAxel-exclusive $140.00
Dec 11, 2026 – Dec 14, 2026 · 3 nights · Compare return dates departing Dec 11, 2026Southwest AirlinesNonstopAxel-exclusive $245.00
Dec 12, 2026 – Dec 19, 2026 · 7 nights · Compare return dates departing Dec 12, 2026Frontier AirlinesNonstopAxel-exclusive $171.50
Dec 12, 2026 – Dec 19, 2026 · 7 nights · Compare return dates departing Dec 12, 2026Alaska AirlinesNonstopAxel-exclusive $306.25
Dec 15, 2026 · One way · Compare return dates departing Dec 15, 2026Southwest AirlinesNonstopAxel-exclusive $130.00
Dec 15, 2026 · One way · Compare return dates departing Dec 15, 2026Alaska AirlinesNonstopAxel-exclusive $135.00
Dec 17, 2026 – Dec 20, 2026 · 3 nights · Compare return dates departing Dec 17, 2026Southwest AirlinesNonstopAxel-exclusive $300.13
Dec 17, 2026 – Dec 20, 2026 · 3 nights · Compare return dates departing Dec 17, 2026Alaska AirlinesNonstopAxel-exclusive $306.25
Dec 18, 2026 – Dec 21, 2026 · 3 nights · Compare return dates departing Dec 18, 2026Frontier AirlinesNonstopAxel-exclusive $171.50
Dec 18, 2026 – Dec 21, 2026 · 3 nights · Compare return dates departing Dec 18, 2026Southwest AirlinesNonstopAxel-exclusive $300.13
Dec 19, 2026 – Dec 26, 2026 · 7 nights · Compare return dates departing Dec 19, 2026Frontier AirlinesNonstopAxel-exclusive $203.00
Dec 19, 2026 – Dec 26, 2026 · 7 nights · Compare return dates departing Dec 19, 2026Alaska AirlinesNonstopAxel-exclusive $362.50
Dec 22, 2026 · One way · Compare return dates departing Dec 22, 2026Southwest AirlinesNonstopAxel-exclusive $188.50
Dec 22, 2026 · One way · Compare return dates departing Dec 22, 2026Alaska AirlinesNonstopAxel-exclusive $195.75
Dec 22, 2026 – Dec 27, 2026 · 5 nights · Compare return dates departing Dec 22, 2026Southwest AirlinesNonstopAxel-exclusive $355.26
Dec 22, 2026 – Dec 27, 2026 · 5 nights · Compare return dates departing Dec 22, 2026Alaska AirlinesNonstopAxel-exclusive $362.50
Dec 24, 2026 – Dec 27, 2026 · 3 nights · Compare return dates departing Dec 24, 2026Southwest AirlinesNonstopAxel-exclusive $355.26
Dec 24, 2026 – Dec 27, 2026 · 3 nights · Compare return dates departing Dec 24, 2026Alaska AirlinesNonstopAxel-exclusive $362.50
Dec 25, 2026 – Dec 28, 2026 · 3 nights · Compare return dates departing Dec 25, 2026Frontier AirlinesNonstopAxel-exclusive $196.00
Dec 25, 2026 – Dec 28, 2026 · 3 nights · Compare return dates departing Dec 25, 2026Southwest AirlinesNonstopAxel-exclusive $343.01
Dec 26, 2026 – Jan 2, 2027 · 7 nights · Compare return dates departing Dec 26, 2026Frontier AirlinesNonstopAxel-exclusive $196.00
Dec 26, 2026 – Jan 2, 2027 · 7 nights · Compare return dates departing Dec 26, 2026Alaska AirlinesNonstopAxel-exclusive $350.00
Dec 29, 2026 · One way · Compare return dates departing Dec 29, 2026Southwest AirlinesNonstopAxel-exclusive $175.50
Dec 29, 2026 · One way · Compare return dates departing Dec 29, 2026Alaska AirlinesNonstopAxel-exclusive $182.25
Dec 30, 2026 – Jan 2, 2027 · 3 nights · Compare return dates departing Dec 30, 2026Frontier AirlinesNonstopAxel-exclusive $189.00
Dec 30, 2026 – Jan 2, 2027 · 3 nights · Compare return dates departing Dec 30, 2026Alaska AirlinesNonstopAxel-exclusive $337.50
Dec 31, 2026 – Jan 3, 2027 · 3 nights · Compare return dates departing Dec 31, 2026Southwest AirlinesNonstopAxel-exclusive $330.76
Dec 31, 2026 – Jan 3, 2027 · 3 nights · Compare return dates departing Dec 31, 2026Alaska AirlinesNonstopAxel-exclusive $337.50

Seattle (SEA) to Denver (DEN): January 2027

Travel datesAirlineStopsTotal price
Jan 1, 2027 – Jan 4, 2027 · 3 nights · Compare return dates departing Jan 1, 2027Frontier AirlinesNonstopAxel-exclusive $164.50
Jan 1, 2027 – Jan 4, 2027 · 3 nights · Compare return dates departing Jan 1, 2027Southwest AirlinesNonstopAxel-exclusive $287.88
Jan 2, 2027 – Jan 9, 2027 · 7 nights · Compare return dates departing Jan 2, 2027Frontier AirlinesNonstopAxel-exclusive $164.50
Jan 2, 2027 – Jan 9, 2027 · 7 nights · Compare return dates departing Jan 2, 2027Alaska AirlinesNonstopAxel-exclusive $293.75
Jan 5, 2027 · One way · Compare return dates departing Jan 5, 2027Southwest AirlinesNonstopAxel-exclusive $130.00
Jan 5, 2027 · One way · Compare return dates departing Jan 5, 2027Alaska AirlinesNonstopAxel-exclusive $135.00
Jan 7, 2027 – Jan 10, 2027 · 3 nights · Compare return dates departing Jan 7, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Jan 7, 2027 – Jan 10, 2027 · 3 nights · Compare return dates departing Jan 7, 2027Alaska AirlinesNonstopAxel-exclusive $250.00
Jan 8, 2027 – Jan 11, 2027 · 3 nights · Compare return dates departing Jan 8, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Jan 8, 2027 – Jan 11, 2027 · 3 nights · Compare return dates departing Jan 8, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Jan 9, 2027 – Jan 16, 2027 · 7 nights · Compare return dates departing Jan 9, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Jan 9, 2027 – Jan 16, 2027 · 7 nights · Compare return dates departing Jan 9, 2027Alaska AirlinesNonstopAxel-exclusive $250.00
Jan 12, 2027 · One way · Compare return dates departing Jan 12, 2027Southwest AirlinesNonstopAxel-exclusive $130.00
Jan 12, 2027 · One way · Compare return dates departing Jan 12, 2027Alaska AirlinesNonstopAxel-exclusive $135.00
Jan 14, 2027 – Jan 17, 2027 · 3 nights · Compare return dates departing Jan 14, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Jan 14, 2027 – Jan 17, 2027 · 3 nights · Compare return dates departing Jan 14, 2027Alaska AirlinesNonstopAxel-exclusive $250.00
Jan 15, 2027 – Jan 18, 2027 · 3 nights · Compare return dates departing Jan 15, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Jan 15, 2027 – Jan 18, 2027 · 3 nights · Compare return dates departing Jan 15, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Jan 16, 2027 – Jan 23, 2027 · 7 nights · Compare return dates departing Jan 16, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Jan 16, 2027 – Jan 23, 2027 · 7 nights · Compare return dates departing Jan 16, 2027Alaska AirlinesNonstopAxel-exclusive $250.00
Jan 19, 2027 · One way · Compare return dates departing Jan 19, 2027Southwest AirlinesNonstopAxel-exclusive $130.00
Jan 19, 2027 · One way · Compare return dates departing Jan 19, 2027Alaska AirlinesNonstopAxel-exclusive $135.00
Jan 21, 2027 – Jan 24, 2027 · 3 nights · Compare return dates departing Jan 21, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Jan 21, 2027 – Jan 24, 2027 · 3 nights · Compare return dates departing Jan 21, 2027Alaska AirlinesNonstopAxel-exclusive $250.00
Jan 22, 2027 – Jan 25, 2027 · 3 nights · Compare return dates departing Jan 22, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Jan 22, 2027 – Jan 25, 2027 · 3 nights · Compare return dates departing Jan 22, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Jan 23, 2027 – Jan 30, 2027 · 7 nights · Compare return dates departing Jan 23, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Jan 23, 2027 – Jan 30, 2027 · 7 nights · Compare return dates departing Jan 23, 2027Alaska AirlinesNonstopAxel-exclusive $250.00
Jan 26, 2027 · One way · Compare return dates departing Jan 26, 2027Southwest AirlinesNonstopAxel-exclusive $130.00
Jan 26, 2027 · One way · Compare return dates departing Jan 26, 2027Alaska AirlinesNonstopAxel-exclusive $135.00
Jan 28, 2027 – Jan 31, 2027 · 3 nights · Compare return dates departing Jan 28, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Jan 28, 2027 – Jan 31, 2027 · 3 nights · Compare return dates departing Jan 28, 2027Alaska AirlinesNonstopAxel-exclusive $250.00
Jan 29, 2027 – Feb 1, 2027 · 3 nights · Compare return dates departing Jan 29, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Jan 29, 2027 – Feb 1, 2027 · 3 nights · Compare return dates departing Jan 29, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Jan 30, 2027 – Feb 6, 2027 · 7 nights · Compare return dates departing Jan 30, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Jan 30, 2027 – Feb 6, 2027 · 7 nights · Compare return dates departing Jan 30, 2027Alaska AirlinesNonstopAxel-exclusive $250.00

Seattle (SEA) to Denver (DEN): February 2027

Travel datesAirlineStopsTotal price
Feb 2, 2027 · One way · Compare return dates departing Feb 2, 2027Southwest AirlinesNonstopAxel-exclusive $130.00
Feb 2, 2027 · One way · Compare return dates departing Feb 2, 2027Alaska AirlinesNonstopAxel-exclusive $135.00
Feb 4, 2027 – Feb 7, 2027 · 3 nights · Compare return dates departing Feb 4, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Feb 4, 2027 – Feb 7, 2027 · 3 nights · Compare return dates departing Feb 4, 2027Alaska AirlinesNonstopAxel-exclusive $250.00
Feb 5, 2027 – Feb 8, 2027 · 3 nights · Compare return dates departing Feb 5, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Feb 5, 2027 – Feb 8, 2027 · 3 nights · Compare return dates departing Feb 5, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Feb 6, 2027 – Feb 13, 2027 · 7 nights · Compare return dates departing Feb 6, 2027Frontier AirlinesNonstopAxel-exclusive $154.00
Feb 6, 2027 – Feb 13, 2027 · 7 nights · Compare return dates departing Feb 6, 2027Alaska AirlinesNonstopAxel-exclusive $275.00
Feb 12, 2027 – Feb 15, 2027 · 3 nights · Compare return dates departing Feb 12, 2027Frontier AirlinesNonstopAxel-exclusive $168.00
Feb 12, 2027 – Feb 15, 2027 · 3 nights · Compare return dates departing Feb 12, 2027Southwest AirlinesNonstopAxel-exclusive $294.00
Feb 19, 2027 – Feb 22, 2027 · 3 nights · Compare return dates departing Feb 19, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Feb 19, 2027 – Feb 22, 2027 · 3 nights · Compare return dates departing Feb 19, 2027Southwest AirlinesNonstopAxel-exclusive $245.00
Feb 20, 2027 – Feb 27, 2027 · 7 nights · Compare return dates departing Feb 20, 2027Frontier AirlinesNonstopAxel-exclusive $140.00
Feb 20, 2027 – Feb 27, 2027 · 7 nights · Compare return dates departing Feb 20, 2027Alaska AirlinesNonstopAxel-exclusive $250.00

Seattle (SEA) to Denver (DEN): March 2027

Travel datesAirlineStopsTotal price
Mar 19, 2027 – Mar 22, 2027 · 3 nights · Compare return dates departing Mar 19, 2027Frontier AirlinesNonstopAxel-exclusive $147.00
Mar 19, 2027 – Mar 22, 2027 · 3 nights · Compare return dates departing Mar 19, 2027Southwest AirlinesNonstopAxel-exclusive $257.26
Mar 20, 2027 – Mar 27, 2027 · 7 nights · Compare return dates departing Mar 20, 2027Frontier AirlinesNonstopAxel-exclusive $147.00
Mar 20, 2027 – Mar 27, 2027 · 7 nights · Compare return dates departing Mar 20, 2027Alaska AirlinesNonstopAxel-exclusive $262.50
Mar 25, 2027 – Mar 29, 2027 · 4 nights · Compare return dates departing Mar 25, 2027Southwest AirlinesNonstopAxel-exclusive $291.38
Mar 25, 2027 – Mar 29, 2027 · 4 nights · Compare return dates departing Mar 25, 2027Alaska AirlinesNonstopAxel-exclusive $299.25

Seattle (SEA) to Denver (DEN): April 2027

Travel datesAirlineStopsTotal price
Apr 16, 2027 – Apr 19, 2027 · 3 nights · Compare return dates departing Apr 16, 2027Frontier AirlinesNonstopAxel-exclusive $200.00
Apr 16, 2027 – Apr 19, 2027 · 3 nights · Compare return dates departing Apr 16, 2027Southwest AirlinesNonstopAxel-exclusive $310.00
Apr 17, 2027 – Apr 24, 2027 · 7 nights · Compare return dates departing Apr 17, 2027Frontier AirlinesNonstopAxel-exclusive $200.00
Apr 17, 2027 – Apr 24, 2027 · 7 nights · Compare return dates departing Apr 17, 2027Alaska AirlinesNonstopAxel-exclusive $320.00

Seattle (SEA) to Denver (DEN): May 2027

Travel datesAirlineStopsTotal price
May 14, 2027 – May 17, 2027 · 3 nights · Compare return dates departing May 14, 2027Frontier AirlinesNonstopAxel-exclusive $200.00
May 14, 2027 – May 17, 2027 · 3 nights · Compare return dates departing May 14, 2027Southwest AirlinesNonstopAxel-exclusive $310.00
May 15, 2027 – May 22, 2027 · 7 nights · Compare return dates departing May 15, 2027Frontier AirlinesNonstopAxel-exclusive $200.00
May 15, 2027 – May 22, 2027 · 7 nights · Compare return dates departing May 15, 2027Alaska AirlinesNonstopAxel-exclusive $320.00
May 28, 2027 – May 31, 2027 · 3 nights · Compare return dates departing May 28, 2027Frontier AirlinesNonstopAxel-exclusive $230.00
May 28, 2027 – May 31, 2027 · 3 nights · Compare return dates departing May 28, 2027Southwest AirlinesNonstopAxel-exclusive $356.50

Seattle (SEA) to Denver (DEN): June 2027

Travel datesAirlineStopsTotal price
Jun 11, 2027 – Jun 14, 2027 · 3 nights · Compare return dates departing Jun 11, 2027Frontier AirlinesNonstopAxel-exclusive $200.00
Jun 11, 2027 – Jun 14, 2027 · 3 nights · Compare return dates departing Jun 11, 2027Southwest AirlinesNonstopAxel-exclusive $310.00
Jun 12, 2027 – Jun 19, 2027 · 7 nights · Compare return dates departing Jun 12, 2027Frontier AirlinesNonstopAxel-exclusive $200.00
Jun 12, 2027 – Jun 19, 2027 · 7 nights · Compare return dates departing Jun 12, 2027Alaska AirlinesNonstopAxel-exclusive $320.00

Seattle (SEA) to Denver (DEN): July 2027

Travel datesAirlineStopsTotal price
Jul 2, 2027 – Jul 6, 2027 · 4 nights · Compare return dates departing Jul 2, 2027Frontier AirlinesNonstopAxel-exclusive $240.00
Jul 2, 2027 – Jul 6, 2027 · 4 nights · Compare return dates departing Jul 2, 2027Southwest AirlinesNonstopAxel-exclusive $372.00
Jul 9, 2027 – Jul 12, 2027 · 3 nights · Compare return dates departing Jul 9, 2027Frontier AirlinesNonstopAxel-exclusive $200.00
Jul 9, 2027 – Jul 12, 2027 · 3 nights · Compare return dates departing Jul 9, 2027Southwest AirlinesNonstopAxel-exclusive $310.00
Jul 10, 2027 – Jul 17, 2027 · 7 nights · Compare return dates departing Jul 10, 2027Frontier AirlinesNonstopAxel-exclusive $200.00
Jul 10, 2027 – Jul 17, 2027 · 7 nights · Compare return dates departing Jul 10, 2027Alaska AirlinesNonstopAxel-exclusive $320.00

Seattle (SEA) to Denver (DEN): August 2027

Travel datesAirlineStopsTotal price
Aug 6, 2027 – Aug 9, 2027 · 3 nights · Compare return dates departing Aug 6, 2027Frontier AirlinesNonstopAxel-exclusive $200.00
Aug 6, 2027 – Aug 9, 2027 · 3 nights · Compare return dates departing Aug 6, 2027Southwest AirlinesNonstopAxel-exclusive $310.00
Aug 7, 2027 – Aug 14, 2027 · 7 nights · Compare return dates departing Aug 7, 2027Frontier AirlinesNonstopAxel-exclusive $200.00
Aug 7, 2027 – Aug 14, 2027 · 7 nights · Compare return dates departing Aug 7, 2027Alaska AirlinesNonstopAxel-exclusive $320.00

Seattle (SEA) to Denver (DEN): September 2027

Travel datesAirlineStopsTotal price
Sep 3, 2027 – Sep 6, 2027 · 3 nights · Compare return dates departing Sep 3, 2027Frontier AirlinesNonstopAxel-exclusive $218.00
Sep 3, 2027 – Sep 6, 2027 · 3 nights · Compare return dates departing Sep 3, 2027Southwest AirlinesNonstopAxel-exclusive $337.90
Sep 4, 2027 – Sep 11, 2027 · 7 nights · Compare return dates departing Sep 4, 2027Frontier AirlinesNonstopAxel-exclusive $204.00
Sep 4, 2027 – Sep 11, 2027 · 7 nights · Compare return dates departing Sep 4, 2027Alaska AirlinesNonstopAxel-exclusive $326.40
Sep 24, 2027 – Sep 27, 2027 · 3 nights · Compare return dates departing Sep 24, 2027Frontier AirlinesNonstopAxel-exclusive $190.00
Sep 24, 2027 – Sep 27, 2027 · 3 nights · Compare return dates departing Sep 24, 2027Southwest AirlinesNonstopAxel-exclusive $294.50
Sep 25, 2027 – Oct 2, 2027 · 7 nights · Compare return dates departing Sep 25, 2027Frontier AirlinesNonstopAxel-exclusive $190.00
Sep 25, 2027 – Oct 2, 2027 · 7 nights · Compare return dates departing Sep 25, 2027Alaska AirlinesNonstopAxel-exclusive $304.00

Hotels in Denver for these trips

Hotels: under a trip, hotels in Denver for exactly those nights link to the hotel pages for 2 adults in 1 room. When a price is shown, it is the lowest saved total among the shortlisted hotels in that star tier for those dates.

All hotels in Denver

Route overview: Seattle to Denver (DEN) flight deals

2026-11-19 → 2026-11-22 · Axel-exclusive $245.00

  • Southwest Airlines WN2150: SEA 2026-11-19 09:25:00 → DEN 2026-11-19 13:00:00; nonstop; 155 minutes. Local airport times.
  • Southwest Airlines WN1788: DEN 2026-11-22 08:30:00 → SEA 2026-11-22 10:40:00; nonstop; 190 minutes. Local airport times.

2026-11-19 → 2026-11-22 · Axel-exclusive $250.00

  • Alaska Airlines AS682: SEA 2026-11-19 07:23:00 → DEN 2026-11-19 11:14:00; nonstop; 171 minutes. Local airport times.
  • Alaska Airlines AS421: DEN 2026-11-22 18:37:00 → SEA 2026-11-22 20:41:00; nonstop; 184 minutes. Local airport times.

2026-11-24 · one way · Axel-exclusive $182.00

  • Southwest Airlines WN4956: SEA 2026-11-24 06:10:00 → DEN 2026-11-24 09:45:00; nonstop; 155 minutes. Local airport times.

2026-11-24 · one way · Axel-exclusive $189.00

  • Alaska Airlines AS682: SEA 2026-11-24 07:25:00 → DEN 2026-11-24 11:10:00; nonstop; 165 minutes. Local airport times.

2026-11-28 → 2026-12-05 · Axel-exclusive $168.00

  • Frontier Airlines F91916: SEA 2026-11-28 16:37:00 → DEN 2026-11-28 20:25:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F94545: DEN 2026-12-05 13:32:00 → SEA 2026-12-05 15:43:00; nonstop; 191 minutes. Local airport times.

2026-11-28 → 2026-12-05 · Axel-exclusive $300.00

  • Alaska Airlines AS440: SEA 2026-11-28 20:16:00 → DEN 2026-11-28 23:59:00; nonstop; 163 minutes. Local airport times.
  • Alaska Airlines AS317: DEN 2026-12-05 06:01:00 → SEA 2026-12-05 08:11:00; nonstop; 190 minutes. Local airport times.

2026-12-12 → 2026-12-19 · Axel-exclusive $171.50

  • Frontier Airlines F91916: SEA 2026-12-12 16:37:00 → DEN 2026-12-12 20:25:00; nonstop; 168 minutes. Local airport times.
  • Frontier Airlines F94545: DEN 2026-12-19 13:32:00 → SEA 2026-12-19 15:43:00; nonstop; 191 minutes. Local airport times.

2026-12-12 → 2026-12-19 · Axel-exclusive $306.25

  • Alaska Airlines AS304: SEA 2026-12-12 20:14:00 → DEN 2026-12-12 23:59:00; nonstop; 165 minutes. Local airport times.
  • Alaska Airlines AS309: DEN 2026-12-19 21:42:00 → SEA 2026-12-19 23:49:00; nonstop; 187 minutes. Local airport times.

2026-12-25 → 2026-12-28 · Axel-exclusive $196.00

  • Frontier Airlines F91916: SEA 2026-12-25 16:58:00 → DEN 2026-12-25 20:48:00; nonstop; 170 minutes. Local airport times.
  • Frontier Airlines F9605: DEN 2026-12-28 10:08:00 → SEA 2026-12-28 12:22:00; nonstop; 194 minutes. Local airport times.

2026-12-25 → 2026-12-28 · Axel-exclusive $343.01

  • Southwest Airlines WN3823: SEA 2026-12-25 13:55:00 → DEN 2026-12-25 17:30:00; nonstop; 155 minutes. Local airport times.
  • Southwest Airlines WN244: DEN 2026-12-28 15:40:00 → SEA 2026-12-28 17:50:00; nonstop; 190 minutes. Local airport times.

2027-01-07 → 2027-01-10 · Axel-exclusive $245.00

  • Southwest Airlines WN2150: SEA 2027-01-07 09:25:00 → DEN 2027-01-07 13:00:00; nonstop; 155 minutes. Local airport times.
  • Southwest Airlines WN1788: DEN 2027-01-10 08:30:00 → SEA 2027-01-10 10:40:00; nonstop; 190 minutes. Local airport times.

2027-01-07 → 2027-01-10 · Axel-exclusive $270.00

  • United Airlines UA757: SEA 2027-01-07 16:04:00 → DEN 2027-01-07 19:45:00; nonstop; 161 minutes. Local airport times.
  • United Airlines UA2302: DEN 2027-01-10 11:30:00 → SEA 2027-01-10 13:35:00; nonstop; 185 minutes. Local airport times.

2027-01-21 → 2027-01-24 · Axel-exclusive $245.00

  • Southwest Airlines WN2150: SEA 2027-01-21 09:25:00 → DEN 2027-01-21 13:00:00; nonstop; 155 minutes. Local airport times.
  • Southwest Airlines WN1788: DEN 2027-01-24 08:30:00 → SEA 2027-01-24 10:40:00; nonstop; 190 minutes. Local airport times.

2027-01-21 → 2027-01-24 · Axel-exclusive $260.00

  • Delta Air Lines DL1358: SEA 2027-01-21 08:30:00 → DEN 2027-01-21 12:22:00; nonstop; 172 minutes. Local airport times.
  • Delta Air Lines DL2543: DEN 2027-01-24 18:35:00 → SEA 2027-01-24 20:46:00; nonstop; 191 minutes. Local airport times.

2027-02-04 → 2027-02-07 · Axel-exclusive $245.00

  • Southwest Airlines WN2150: SEA 2027-02-04 09:25:00 → DEN 2027-02-04 13:00:00; nonstop; 155 minutes. Local airport times.
  • Southwest Airlines WN1788: DEN 2027-02-07 08:30:00 → SEA 2027-02-07 10:40:00; nonstop; 190 minutes. Local airport times.

2027-02-04 → 2027-02-07 · Axel-exclusive $250.00

  • Alaska Airlines AS421: SEA 2027-02-04 15:16:00 → DEN 2027-02-04 18:56:00; nonstop; 160 minutes. Local airport times.
  • Alaska Airlines AS421: DEN 2027-02-07 19:24:00 → SEA 2027-02-07 21:40:00; nonstop; 196 minutes. Local airport times.

2027-03-19 → 2027-03-22 · Axel-exclusive $147.00

  • Frontier Airlines F91916: SEA 2027-03-19 13:24:00 → DEN 2027-03-19 17:13:00; nonstop; 169 minutes. Local airport times.
  • Frontier Airlines F9605: DEN 2027-03-22 10:08:00 → SEA 2027-03-22 12:22:00; nonstop; 194 minutes. Local airport times.

2027-03-19 → 2027-03-22 · Axel-exclusive $283.50

  • United Airlines UA2601: SEA 2027-03-19 05:00:00 → DEN 2027-03-19 08:41:00; nonstop; 161 minutes. Local airport times.
  • United Airlines UA2271: DEN 2027-03-22 07:40:00 → SEA 2027-03-22 09:49:00; nonstop; 189 minutes. Local airport times.

2027-05-15 → 2027-05-22 · Axel-exclusive $200.00

  • Frontier Airlines F91916: SEA 2027-05-15 13:37:00 → DEN 2027-05-15 17:26:00; nonstop; 169 minutes. Local airport times.
  • Frontier Airlines F9605: DEN 2027-05-22 10:08:00 → SEA 2027-05-22 12:22:00; nonstop; 194 minutes. Local airport times.

2027-05-15 → 2027-05-22 · Axel-exclusive $320.00

  • Alaska Airlines AS310: SEA 2027-05-15 19:37:00 → DEN 2027-05-15 23:17:00; nonstop; 160 minutes. Local airport times.
  • Alaska Airlines AS309: DEN 2027-05-22 21:42:00 → SEA 2027-05-22 23:49:00; nonstop; 187 minutes. Local airport times.

2027-07-10 → 2027-07-17 · Axel-exclusive $200.00

  • Frontier Airlines F91916: SEA 2027-07-10 13:37:00 → DEN 2027-07-10 17:26:00; nonstop; 169 minutes. Local airport times.
  • Frontier Airlines F9605: DEN 2027-07-17 10:08:00 → SEA 2027-07-17 12:22:00; nonstop; 194 minutes. Local airport times.

2027-07-10 → 2027-07-17 · Axel-exclusive $320.00

  • Alaska Airlines AS310: SEA 2027-07-10 19:37:00 → DEN 2027-07-10 23:17:00; nonstop; 160 minutes. Local airport times.
  • Alaska Airlines AS309: DEN 2027-07-17 21:42:00 → SEA 2027-07-17 23:49:00; nonstop; 187 minutes. Local airport times.

2027-09-25 → 2027-10-02 · Axel-exclusive $190.00

  • Frontier Airlines F91916: SEA 2027-09-25 13:37:00 → DEN 2027-09-25 17:26:00; nonstop; 169 minutes. Local airport times.
  • Frontier Airlines F9605: DEN 2027-10-02 10:08:00 → SEA 2027-10-02 12:22:00; nonstop; 194 minutes. Local airport times.

2027-09-25 → 2027-10-02 · Axel-exclusive $304.00

  • Alaska Airlines AS310: SEA 2027-09-25 19:37:00 → DEN 2027-09-25 23:17:00; nonstop; 160 minutes. Local airport times.
  • Alaska Airlines AS309: DEN 2027-10-02 21:42:00 → SEA 2027-10-02 23:49:00; nonstop; 187 minutes. Local airport times.

More dates for this route

Flights from Seattle (SEA)

More trip ideas from Seattle

Colorado in summer from other cities

Where to go from Seattle

Round-trip totals · Economy · USD · 1 adult unless shown. "From" is a starting total: you pick the return in Axel. Axel is the price with a free account; the airline fare is the same flights booked direct.

DestinationWhy goFlightsAxel-exclusiveDates
Denver (DEN)Denver's breweries and the Rockies within an hourNo matching fare savedJun 26 – Jul 3, 2027 (suggested)Search these dates
Aspen (ASE)Aspen's four ski mountains and summer trailsNo nonstop seenNo matching fare savedJun 26 – Jul 3, 2027 (suggested)Search these dates
Vail (EGE)Vail and Beaver Creek skiingNo matching fare savedJun 26 – Jul 3, 2027 (suggested)Search these dates
Hayden (HDN)Steamboat Springs' champagne powder and hot springsNonstop · AlaskaNo matching fare savedJun 26 – Jul 3, 2027 (suggested)Search these dates
Montrose (MTJ)Montrose, the gateway to Telluride and the San Juan MountainsNo nonstop seenNo matching fare savedJun 26 – Jul 3, 2027 (suggested)Search these dates
Grand Junction (GJT)Grand Junction's wineries and Colorado National MonumentNo nonstop seenNo matching fare savedJun 26 – Jul 3, 2027 (suggested)Search these dates
Colorado Springs (COS)Colorado Springs' Pikes Peak and Garden of the GodsNo nonstop seenNo matching fare savedJun 26 – Jul 3, 2027 (suggested)Search these dates
Durango (DRO)Durango's narrow-gauge railroad and Purgatory skiingNo nonstop seenNo matching fare savedJun 26 – Jul 3, 2027 (suggested)Search these dates

Keep exploring

Hotels in Denver with Axel

Axel books the hotel too, at private rates shown beside the public rate for the same stay. Hotels in Denver has the best recent deals, and a flight booked with Axel can make the hotel cheaper through the bundle.

Where to stay: Where to stay in Denver: the 6 best neighborhoods, ranked · Denver hotels where a family of four can share one room

Hotel details in Denver: Limelight Hotel Denver 4★ from $201 a night in the next 30 days · Hyatt Regency Denver at Colorado Convention Center 4★ · The Ramble Hotel 4★ · 11th Avenue Hostel 2★ from $65 a night in the next 30 days · Halcyon, a hotel in Cherry Creek, Denver 4★ · All 82 hotels in Denver

For AI assistants

  • This page: Flights from Seattle to Colorado in summer. Round-trip fares from Seattle to Colorado in summer: Denver, Aspen, Vail, Hayden, Montrose and Grand Junction and more. Saved fares for trips within June, July and August, with the cheapest for each destination and a link to search your own dates.
  • Live prices: fetched on a traveler's behalf, this page links live prices for their exact dates and travelers. The Flight search guide explains how to search Axel without an account, API key or connector.
Browse flight destinations