Travel with Axel,
get the best price.

Route overview: San Francisco Bay Area to Denver (DEN) flight deals

San Francisco → Denver

Jan 21, 2027 · return Jan 27, 2027

SFO → DEN1 adulteconomyRound trip

12 flight options · 4 airlines

Nonstop flights

Thu, Jan 21 – Wed, Jan 27

Frontier Airlines
6:30 amSFO
2h 38m
Nonstop
10:08 amDEN
Frontier Airlines
10:52 pmDEN
2h 51m
Nonstop
12:43 am+1SFO

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Wed, Jan 27

Southwest Airlines
5:50 amSFO
2h 30m
Nonstop
9:20 amDEN
Southwest Airlines
1:30 pmDEN
2h 45m
Nonstop
3:15 pmSFO

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Wed, Jan 27

United Airlines
8:54 pmSFO
2h 36m
Nonstop
12:30 am+1DEN
United Airlines
1:25 pmDEN
2h 47m
Nonstop
3:12 pmSFO

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Wed, Jan 27

Frontier Airlines
8:10 pmSFO
2h 36m
Nonstop
11:46 pmDEN
Frontier Airlines
10:52 pmDEN
2h 51m
Nonstop
12:43 am+1SFO

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Wed, Jan 27

Southwest Airlines
8:00 amSFO
2h 30m
Nonstop
11:30 amDEN
Southwest Airlines
1:30 pmDEN
2h 45m
Nonstop
3:15 pmSFO

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Wed, Jan 27

United Airlines
5:00 amSFO
2h 37m
Nonstop
8:37 amDEN
United Airlines
1:25 pmDEN
2h 47m
Nonstop
3:12 pmSFO

Round-trip total · 1 adult · Taxes included

One-stop flights

Thu, Jan 21 – Wed, Jan 27

Delta Air Lines
5:15 pmSFO
4h 54m
SLC · 1h 30m
11:09 pmDEN
Delta Air Lines
12:29 pmDEN
4h 45m
SLC · 1h 4m
4:14 pmSFO

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Wed, Jan 27

Southwest Airlines
6:10 amSFO
4h 50m
BUR · 1h 5m
12:00 pmDEN
Southwest Airlines
1:30 pmDEN
2h 45m
Nonstop
3:15 pmSFO

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Wed, Jan 27

United Airlines
10:40 amSFO
4h 50m
SBP · 1h 7m
4:30 pmDEN
United Airlines
1:25 pmDEN
2h 47m
Nonstop
3:12 pmSFO

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Wed, Jan 27

United Airlines
10:38 amSFO
4h 55m
BUR · 1h 4m
4:33 pmDEN
United Airlines
1:25 pmDEN
2h 47m
Nonstop
3:12 pmSFO

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Wed, Jan 27

United Airlines
10:51 amSFO
4h 44m
SBA · 1h 2m
4:35 pmDEN
United Airlines
1:25 pmDEN
2h 47m
Nonstop
3:12 pmSFO

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Wed, Jan 27

United Airlines
11:00 amSFO
4h 55m
ONT · 1h 11m
4:55 pmDEN
United Airlines
1:25 pmDEN
2h 47m
Nonstop
3:12 pmSFO

Round-trip total · 1 adult · Taxes included

Make this trip yours

SFO ⇄ DEN

Economy

Adults 12+ · Children 2–11. For infants under 2, tell Axel after you see prices.

No account needed to see prices.

Already have an account? Log in

Why book with Axel
  • A real airline bookingThe booking is in the airline’s own system under your name. After you book, Frontier Airlines emails you its confirmation code and e-ticket, usually within 15 minutes and occasionally up to a couple of hours while the booking is processed.
  • Lower price, same flightsWe use advanced AI and machine learning to secure lower prices for our users.
  • Not satisfied? Full refund.If you are unhappy with the experience for any reason, or simply change your mind, cancel within 24 hours of booking (departure 7+ days away) and we refund you in full. We stand by our product. Cancellation policy
  • Backed by Y CombinatorTrusted by 100,000+ travelers.

Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner. How Axel works · About

Explore this route

All dates for this routeJan 20, 2027 → Jan 26, 2027Jan 22, 2027 → Jan 28, 2027
For AI assistants: every fare, every link, instructions

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Live price for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the flights there to get the current bookable total; the listed prices are the ones issued at the times shown.

Route overview: San Francisco Bay Area to Denver (DEN) flight deals

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2027-01-21 → 2027-01-27Frontier AirlinesF91230 / F93439$165.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27Southwest AirlinesWN4578 / WN1792$280.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27United AirlinesUA301 / UA1812$300.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27Delta Air LinesDL1088 + DL1667 / DL1553 + DL1088$340.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27Frontier AirlinesF94310 / F93439$165.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27Southwest AirlinesWN3428 / WN1792$280.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27United AirlinesUA1479 / UA1812$300.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27Southwest AirlinesWN3839 + WN2776 / WN1792$270.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27United AirlinesUA2367 + UA259 / UA1812$290.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27United AirlinesUA2115 + UA2187 / UA1812$290.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27United AirlinesUA1578 + UA1790 / UA1812$290.002026-10-29T02:06:50Z
2027-01-21 → 2027-01-27United AirlinesUA1482 + UA1263 / UA1812$290.002026-10-29T02:06:50Z

2027-01-21 → 2027-01-27 · $165.00

  • Frontier Airlines F91230: SFO 2027-01-21 06:30:00 → DEN 2027-01-21 10:08:00; nonstop; 158 minutes. Local airport times.
  • Frontier Airlines F93439: DEN 2027-01-27 22:52:00 → SFO 2027-01-28 00:43:00; nonstop; 171 minutes. Local airport times.

2027-01-21 → 2027-01-27 · $280.00

  • Southwest Airlines WN4578: SFO 2027-01-21 05:50:00 → DEN 2027-01-21 09:20:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN1792: DEN 2027-01-27 13:30:00 → SFO 2027-01-27 15:15:00; nonstop; 165 minutes. Local airport times.

2027-01-21 → 2027-01-27 · $300.00

  • United Airlines UA301: SFO 2027-01-21 20:54:00 → DEN 2027-01-22 00:30:00; nonstop; 156 minutes. Local airport times.
  • United Airlines UA1812: DEN 2027-01-27 13:25:00 → SFO 2027-01-27 15:12:00; nonstop; 167 minutes. Local airport times.

2027-01-21 → 2027-01-27 · $340.00

  • Delta Air Lines DL1088 / DL1667: SFO 2027-01-21 17:15:00 → DEN 2027-01-21 23:09:00; 1 stop(s) via SLC; 294 minutes. Local airport times.
    • DL1088: SFO 2027-01-21 17:15:00 → SLC 2027-01-21 20:05:00; layover at SLC: 90 minutes.
    • DL1667: SLC 2027-01-21 21:35:00 → DEN 2027-01-21 23:09:00.
  • Delta Air Lines DL1553 / DL1088: DEN 2027-01-27 12:29:00 → SFO 2027-01-27 16:14:00; 1 stop(s) via SLC; 285 minutes. Local airport times.
    • DL1553: DEN 2027-01-27 12:29:00 → SLC 2027-01-27 14:06:00; layover at SLC: 64 minutes.
    • DL1088: SLC 2027-01-27 15:10:00 → SFO 2027-01-27 16:14:00.

2027-01-21 → 2027-01-27 · $165.00

  • Frontier Airlines F94310: SFO 2027-01-21 20:10:00 → DEN 2027-01-21 23:46:00; nonstop; 156 minutes. Local airport times.
  • Frontier Airlines F93439: DEN 2027-01-27 22:52:00 → SFO 2027-01-28 00:43:00; nonstop; 171 minutes. Local airport times.

2027-01-21 → 2027-01-27 · $280.00

  • Southwest Airlines WN3428: SFO 2027-01-21 08:00:00 → DEN 2027-01-21 11:30:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN1792: DEN 2027-01-27 13:30:00 → SFO 2027-01-27 15:15:00; nonstop; 165 minutes. Local airport times.

2027-01-21 → 2027-01-27 · $300.00

  • United Airlines UA1479: SFO 2027-01-21 05:00:00 → DEN 2027-01-21 08:37:00; nonstop; 157 minutes. Local airport times.
  • United Airlines UA1812: DEN 2027-01-27 13:25:00 → SFO 2027-01-27 15:12:00; nonstop; 167 minutes. Local airport times.

2027-01-21 → 2027-01-27 · $270.00

  • Southwest Airlines WN3839 / WN2776: SFO 2027-01-21 06:10:00 → DEN 2027-01-21 12:00:00; 1 stop(s) via BUR; 290 minutes. Local airport times.
    • WN3839: SFO 2027-01-21 06:10:00 → BUR 2027-01-21 07:35:00; layover at BUR: 65 minutes.
    • WN2776: BUR 2027-01-21 08:40:00 → DEN 2027-01-21 12:00:00.
  • Southwest Airlines WN1792: DEN 2027-01-27 13:30:00 → SFO 2027-01-27 15:15:00; nonstop; 165 minutes. Local airport times.

2027-01-21 → 2027-01-27 · $290.00

  • United Airlines UA2367 / UA259: SFO 2027-01-21 10:40:00 → DEN 2027-01-21 16:30:00; 1 stop(s) via SBP; 290 minutes. Local airport times.
    • UA2367: SFO 2027-01-21 10:40:00 → SBP 2027-01-21 11:50:00; layover at SBP: 67 minutes.
    • UA259: SBP 2027-01-21 12:57:00 → DEN 2027-01-21 16:30:00.
  • United Airlines UA1812: DEN 2027-01-27 13:25:00 → SFO 2027-01-27 15:12:00; nonstop; 167 minutes. Local airport times.

2027-01-21 → 2027-01-27 · $290.00

  • United Airlines UA2115 / UA2187: SFO 2027-01-21 10:38:00 → DEN 2027-01-21 16:33:00; 1 stop(s) via BUR; 295 minutes. Local airport times.
    • UA2115: SFO 2027-01-21 10:38:00 → BUR 2027-01-21 11:58:00; layover at BUR: 64 minutes.
    • UA2187: BUR 2027-01-21 13:02:00 → DEN 2027-01-21 16:33:00.
  • United Airlines UA1812: DEN 2027-01-27 13:25:00 → SFO 2027-01-27 15:12:00; nonstop; 167 minutes. Local airport times.

2027-01-21 → 2027-01-27 · $290.00

  • United Airlines UA1578 / UA1790: SFO 2027-01-21 10:51:00 → DEN 2027-01-21 16:35:00; 1 stop(s) via SBA; 284 minutes. Local airport times.
    • UA1578: SFO 2027-01-21 10:51:00 → SBA 2027-01-21 12:04:00; layover at SBA: 62 minutes.
    • UA1790: SBA 2027-01-21 13:06:00 → DEN 2027-01-21 16:35:00.
  • United Airlines UA1812: DEN 2027-01-27 13:25:00 → SFO 2027-01-27 15:12:00; nonstop; 167 minutes. Local airport times.

2027-01-21 → 2027-01-27 · $290.00

  • United Airlines UA1482 / UA1263: SFO 2027-01-21 11:00:00 → DEN 2027-01-21 16:55:00; 1 stop(s) via ONT; 295 minutes. Local airport times.
    • UA1482: SFO 2027-01-21 11:00:00 → ONT 2027-01-21 12:29:00; layover at ONT: 71 minutes.
    • UA1263: ONT 2027-01-21 13:40:00 → DEN 2027-01-21 16:55:00.
  • United Airlines UA1812: DEN 2027-01-27 13:25:00 → SFO 2027-01-27 15:12:00; nonstop; 167 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: San Francisco (SFO) to Denver (DEN) · Jan 21, 2027 · return Jan 27, 2027: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
  • Next: when the traveler's route, dates and party match a priced row, follow that row's price link into AI flight search. Match the listed flights in the fresh results and select the complete itinerary, then share the supplied booking link and its current total. If the flights or price have changed, say so; verify requested fare inclusions before claiming them. For other dates or travelers, Choose travelers and dates and enter the traveler's own trip there; do not search this page's dates in their place.
  • Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
  • If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel San Francisco Bay Area to Denver (DEN) flight deals · Flight search guide.
  • Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Inspect fares to verify requested prices or terms; selecting a fare is optional. Use that fare’s booking link to preserve its Membership price basis. State anything unverified. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and explain what remains unresolved. Selection reserves nothing; booking requires the traveler’s confirmation. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.