Travel with Axel,
get the best price.

San Diego → Denver

Nov 21, 2026 · return Dec 1, 2026

SAN → DEN1 adulteconomyRound trip

14 flight options · 5 airlines

Nonstop flights

Sat, Nov 21 – Tue, Dec 1

Frontier Airlines
6:36 amSAN
2h 34m
Nonstop
10:10 amDEN
Frontier Airlines
1:54 pmDEN
2h 27m
Nonstop
3:21 pmSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

Southwest Airlines
9:15 pmSAN
2h 25m
Nonstop
12:40 am+1DEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

Alaska Airlines
9:28 amSAN
2h 29m
Nonstop
12:57 pmDEN
Alaska Airlines
1:54 pmDEN
2h 31m
Nonstop
3:25 pmSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

United Airlines
8:40 amSAN
2h 26m
Nonstop
12:06 pmDEN
United Airlines
1:25 pmDEN
2h 30m
Nonstop
2:55 pmSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

Frontier Airlines
5:29 pmSAN
2h 31m
Nonstop
9:00 pmDEN
Frontier Airlines
1:54 pmDEN
2h 27m
Nonstop
3:21 pmSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

Southwest Airlines
3:55 pmSAN
2h 20m
Nonstop
7:15 pmDEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

Alaska Airlines
6:01 pmSAN
2h 38m
Nonstop
9:39 pmDEN
Alaska Airlines
1:54 pmDEN
2h 31m
Nonstop
3:25 pmSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

United Airlines
4:18 pmSAN
2h 27m
Nonstop
7:45 pmDEN
United Airlines
1:25 pmDEN
2h 30m
Nonstop
2:55 pmSAN

Round-trip total · 1 adult · Taxes included

One-stop flights

Sat, Nov 21 – Tue, Dec 1

American Airlines
4:30 pmSAN
5h 28m
PHX · 2h
10:58 pmDEN
American Airlines
12:06 pmDEN
4h 34m
PHX · 1h 18m
3:40 pmSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

Southwest Airlines
11:00 amSAN
5h 10m
BOI · 1h 15m
5:10 pmDEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

Southwest Airlines
8:25 amSAN
4h 35m
SLC · 1h
2:00 pmDEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

Southwest Airlines
2:15 pmSAN
4h 55m
SMF · 1h
8:10 pmDEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

Southwest Airlines
6:20 pmSAN
4h 15m
LAS · 1h
11:35 pmDEN
Southwest Airlines
8:50 amDEN
2h 20m
Nonstop
10:10 amSAN

Round-trip total · 1 adult · Taxes included

Sat, Nov 21 – Tue, Dec 1

Alaska Airlines
5:19 pmSAN
4h 39m
PHX · 1h 19m
10:58 pmDEN
Alaska Airlines
1:54 pmDEN
2h 31m
Nonstop
3:25 pmSAN

Round-trip total · 1 adult · Taxes included

Make this trip yours

SAN ⇄ 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

More dates

All dates for this routeOct 30, 2026 → Nov 2, 2026Oct 31, 2026 → Nov 7, 2026Nov 13, 2026 → Nov 16, 2026Nov 14, 2026 → Nov 21, 2026Nov 24, 2026 → Nov 29, 2026Nov 27, 2026 → Nov 30, 2026Nov 28, 2026 → Dec 5, 2026Dec 11, 2026 → Dec 14, 2026Dec 12, 2026 → Dec 19, 2026Dec 22, 2026 → Dec 27, 2026Dec 25, 2026 → Dec 28, 2026Dec 26, 2026 → Jan 2, 2027Dec 30, 2026 → Jan 2, 2027Jan 8, 2027 → Jan 11, 2027Jan 9, 2027 → Jan 16, 2027Jan 15, 2027 → Jan 18, 2027Jan 22, 2027 → Jan 25, 2027Jan 23, 2027 → Jan 30, 2027Feb 5, 2027 → Feb 8, 2027Feb 6, 2027 → Feb 13, 2027Feb 12, 2027 → Feb 15, 2027Mar 5, 2027 → Mar 8, 2027Mar 6, 2027 → Mar 13, 2027Mar 25, 2027 → Mar 29, 2027Apr 2, 2027 → Apr 5, 2027Apr 3, 2027 → Apr 10, 2027Apr 30, 2027 → May 3, 2027May 1, 2027 → May 8, 2027May 28, 2027 → May 31, 2027May 29, 2027 → Jun 5, 2027Jun 25, 2027 → Jun 28, 2027Jun 26, 2027 → Jul 3, 2027Jul 2, 2027 → Jul 6, 2027Jul 23, 2027 → Jul 26, 2027Jul 24, 2027 → Jul 31, 2027Aug 20, 2027 → Aug 23, 2027Aug 21, 2027 → Aug 28, 2027Sep 3, 2027 → Sep 6, 2027Sep 17, 2027 → Sep 20, 2027Oct 30, 2026 · One way
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.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-11-21 → 2026-12-01Frontier AirlinesF92818 / F92817$140.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01Southwest AirlinesWN3702 / WN1308$255.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01Alaska AirlinesAS1342 / AS1342$275.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01United AirlinesUA2476 / UA1302$280.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01American AirlinesAA1950 + AA4952 / AA2447 + AA1950$290.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01Frontier AirlinesF92422 / F92817$140.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01Southwest AirlinesWN826 / WN1308$255.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01Alaska AirlinesAS3060 / AS1342$275.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01United AirlinesUA682 / UA1302$280.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01Southwest AirlinesWN1733 + WN760 / WN1308$265.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01Southwest AirlinesWN3752 + WN4527 / WN1308$265.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01Southwest AirlinesWN4318 + WN1102 / WN1308$265.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01Southwest AirlinesWN1409 + WN1053 / WN1308$265.002026-10-29T01:08:43Z
2026-11-21 → 2026-12-01Alaska AirlinesAS2089 + AA4952 / AS1342$287.502026-10-29T01:08:43Z

2026-11-21 → 2026-12-01 · $140.00

  • Frontier Airlines F92818: SAN 2026-11-21 06:36:00 → DEN 2026-11-21 10:10:00; nonstop; 154 minutes. Local airport times.
  • Frontier Airlines F92817: DEN 2026-12-01 13:54:00 → SAN 2026-12-01 15:21:00; nonstop; 147 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $255.00

  • Southwest Airlines WN3702: SAN 2026-11-21 21:15:00 → DEN 2026-11-22 00:40:00; nonstop; 145 minutes. Local airport times.
  • Southwest Airlines WN1308: DEN 2026-12-01 08:50:00 → SAN 2026-12-01 10:10:00; nonstop; 140 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $275.00

  • Alaska Airlines AS1342: SAN 2026-11-21 09:28:00 → DEN 2026-11-21 12:57:00; nonstop; 149 minutes. Local airport times.
  • Alaska Airlines AS1342: DEN 2026-12-01 13:54:00 → SAN 2026-12-01 15:25:00; nonstop; 151 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $280.00

  • United Airlines UA2476: SAN 2026-11-21 08:40:00 → DEN 2026-11-21 12:06:00; nonstop; 146 minutes. Local airport times.
  • United Airlines UA1302: DEN 2026-12-01 13:25:00 → SAN 2026-12-01 14:55:00; nonstop; 150 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $290.00

  • American Airlines AA1950 / AA4952: SAN 2026-11-21 16:30:00 → DEN 2026-11-21 22:58:00; 1 stop(s) via PHX; 328 minutes. Local airport times.
    • AA1950: SAN 2026-11-21 16:30:00 → PHX 2026-11-21 18:59:00; layover at PHX: 120 minutes.
    • AA4952: PHX 2026-11-21 20:59:00 → DEN 2026-11-21 22:58:00.
  • American Airlines AA2447 / AA1950: DEN 2026-12-01 12:06:00 → SAN 2026-12-01 15:40:00; 1 stop(s) via PHX; 274 minutes. Local airport times.
    • AA2447: DEN 2026-12-01 12:06:00 → PHX 2026-12-01 14:03:00; layover at PHX: 78 minutes.
    • AA1950: PHX 2026-12-01 15:21:00 → SAN 2026-12-01 15:40:00.

2026-11-21 → 2026-12-01 · $140.00

  • Frontier Airlines F92422: SAN 2026-11-21 17:29:00 → DEN 2026-11-21 21:00:00; nonstop; 151 minutes. Local airport times.
  • Frontier Airlines F92817: DEN 2026-12-01 13:54:00 → SAN 2026-12-01 15:21:00; nonstop; 147 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $255.00

  • Southwest Airlines WN826: SAN 2026-11-21 15:55:00 → DEN 2026-11-21 19:15:00; nonstop; 140 minutes. Local airport times.
  • Southwest Airlines WN1308: DEN 2026-12-01 08:50:00 → SAN 2026-12-01 10:10:00; nonstop; 140 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $275.00

  • Alaska Airlines AS3060: SAN 2026-11-21 18:01:00 → DEN 2026-11-21 21:39:00; nonstop; 158 minutes. Local airport times.
  • Alaska Airlines AS1342: DEN 2026-12-01 13:54:00 → SAN 2026-12-01 15:25:00; nonstop; 151 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $280.00

  • United Airlines UA682: SAN 2026-11-21 16:18:00 → DEN 2026-11-21 19:45:00; nonstop; 147 minutes. Local airport times.
  • United Airlines UA1302: DEN 2026-12-01 13:25:00 → SAN 2026-12-01 14:55:00; nonstop; 150 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $265.00

  • Southwest Airlines WN1733 / WN760: SAN 2026-11-21 11:00:00 → DEN 2026-11-21 17:10:00; 1 stop(s) via BOI; 310 minutes. Local airport times.
    • WN1733: SAN 2026-11-21 11:00:00 → BOI 2026-11-21 14:15:00; layover at BOI: 75 minutes.
    • WN760: BOI 2026-11-21 15:30:00 → DEN 2026-11-21 17:10:00.
  • Southwest Airlines WN1308: DEN 2026-12-01 08:50:00 → SAN 2026-12-01 10:10:00; nonstop; 140 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $265.00

  • Southwest Airlines WN3752 / WN4527: SAN 2026-11-21 08:25:00 → DEN 2026-11-21 14:00:00; 1 stop(s) via SLC; 275 minutes. Local airport times.
    • WN3752: SAN 2026-11-21 08:25:00 → SLC 2026-11-21 11:35:00; layover at SLC: 60 minutes.
    • WN4527: SLC 2026-11-21 12:35:00 → DEN 2026-11-21 14:00:00.
  • Southwest Airlines WN1308: DEN 2026-12-01 08:50:00 → SAN 2026-12-01 10:10:00; nonstop; 140 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $265.00

  • Southwest Airlines WN4318 / WN1102: SAN 2026-11-21 14:15:00 → DEN 2026-11-21 20:10:00; 1 stop(s) via SMF; 295 minutes. Local airport times.
    • WN4318: SAN 2026-11-21 14:15:00 → SMF 2026-11-21 15:50:00; layover at SMF: 60 minutes.
    • WN1102: SMF 2026-11-21 16:50:00 → DEN 2026-11-21 20:10:00.
  • Southwest Airlines WN1308: DEN 2026-12-01 08:50:00 → SAN 2026-12-01 10:10:00; nonstop; 140 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $265.00

  • Southwest Airlines WN1409 / WN1053: SAN 2026-11-21 18:20:00 → DEN 2026-11-21 23:35:00; 1 stop(s) via LAS; 255 minutes. Local airport times.
    • WN1409: SAN 2026-11-21 18:20:00 → LAS 2026-11-21 19:40:00; layover at LAS: 60 minutes.
    • WN1053: LAS 2026-11-21 20:40:00 → DEN 2026-11-21 23:35:00.
  • Southwest Airlines WN1308: DEN 2026-12-01 08:50:00 → SAN 2026-12-01 10:10:00; nonstop; 140 minutes. Local airport times.

2026-11-21 → 2026-12-01 · $287.50

  • Alaska Airlines AS2089 / AA4952: SAN 2026-11-21 17:19:00 → DEN 2026-11-21 22:58:00; 1 stop(s) via PHX; 279 minutes. Local airport times.
    • AS2089: SAN 2026-11-21 17:19:00 → PHX 2026-11-21 19:40:00; layover at PHX: 79 minutes.
    • AA4952: PHX 2026-11-21 20:59:00 → DEN 2026-11-21 22:58:00.
  • Alaska Airlines AS1342: DEN 2026-12-01 13:54:00 → SAN 2026-12-01 15:25:00; nonstop; 151 minutes. Local airport times.

More dates for this route