Travel with Axel,
get the best price.

Denver → San Francisco

Dec 8, 2026 · return Dec 14, 2026

DEN → SFO1 adulteconomyRound trip

12 flight options · 5 airlines

Nonstop flights

Tue, Dec 8 – Mon, Dec 14

Frontier Airlines
2:09 pmDEN
2h 53m
Nonstop
4:02 pmSFO
Frontier Airlines
6:02 amSFO
2h 38m
Nonstop
9:40 amDEN

Round-trip total · 1 adult · Taxes included

Tue, Dec 8 – Mon, Dec 14

Southwest Airlines
9:20 amDEN
2h 50m
Nonstop
11:10 amSFO
Southwest Airlines
8:00 amSFO
2h 30m
Nonstop
11:30 amDEN

Round-trip total · 1 adult · Taxes included

Tue, Dec 8 – Mon, Dec 14

United Airlines
5:25 pmDEN
2h 46m
Nonstop
7:11 pmSFO
United Airlines
1:00 pmSFO
2h 36m
Nonstop
4:36 pmDEN

Round-trip total · 1 adult · Taxes included

Tue, Dec 8 – Mon, Dec 14

Frontier Airlines
10:29 pmDEN
2h 51m
Nonstop
12:20 am+1SFO
Frontier Airlines
6:02 amSFO
2h 38m
Nonstop
9:40 amDEN

Round-trip total · 1 adult · Taxes included

Tue, Dec 8 – Mon, Dec 14

Southwest Airlines
5:35 pmDEN
2h 45m
Nonstop
7:20 pmSFO
Southwest Airlines
8:00 amSFO
2h 30m
Nonstop
11:30 amDEN

Round-trip total · 1 adult · Taxes included

Tue, Dec 8 – Mon, Dec 14

United Airlines
5:00 amDEN
2h 48m
Nonstop
6:48 amSFO
United Airlines
1:00 pmSFO
2h 36m
Nonstop
4:36 pmDEN

Round-trip total · 1 adult · Taxes included

One-stop flights

Tue, Dec 8 – Mon, Dec 14

Alaska Airlines
1:54 pmDEN
5h 12m
SAN · 1h
6:06 pmSFO
Southwest Airlines
8:00 amSFO
2h 30m
Nonstop
11:30 amDEN

Round-trip total · 1 adult · Taxes included

Tue, Dec 8 – Mon, Dec 14

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

Round-trip total · 1 adult · Taxes included

Tue, Dec 8 – Mon, Dec 14

United Airlines
11:25 amDEN
5h 2m
FAT · 1h 14m
3:27 pmSFO
United Airlines
1:00 pmSFO
2h 36m
Nonstop
4:36 pmDEN

Round-trip total · 1 adult · Taxes included

Tue, Dec 8 – Mon, Dec 14

United Airlines
11:22 amDEN
4h 59m
MRY · 1h 22m
3:21 pmSFO
United Airlines
1:00 pmSFO
2h 36m
Nonstop
4:36 pmDEN

Round-trip total · 1 adult · Taxes included

Tue, Dec 8 – Mon, Dec 14

United Airlines
11:15 amDEN
4h 50m
ONT · 1h 2m
3:05 pmSFO
United Airlines
1:00 pmSFO
2h 36m
Nonstop
4:36 pmDEN

Round-trip total · 1 adult · Taxes included

Tue, Dec 8 – Mon, Dec 14

United Airlines
11:16 amDEN
5h 13m
SMF · 1h 14m
3:29 pmSFO
United Airlines
1:00 pmSFO
2h 36m
Nonstop
4:36 pmDEN

Round-trip total · 1 adult · Taxes included

Make this trip yours

DEN ⇄ SFO

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 routeNov 20, 2026 → Nov 23, 2026Nov 27, 2026 → Dec 4, 2026Nov 20, 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)
2026-12-08 → 2026-12-14Frontier AirlinesF93435 / F91230$165.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14Southwest AirlinesWN2104 / WN3428$270.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14United AirlinesUA1510 / UA540$295.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14Alaska Airlines / Southwest AirlinesAS1342 + AS1435 / WN3428$295.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14Delta Air LinesDL1553 + DL1088 / DL1088 + DL1667$345.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14Frontier AirlinesF93439 / F91230$165.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14Southwest AirlinesWN1817 / WN3428$270.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14United AirlinesUA2367 / UA540$295.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14United AirlinesUA335 + UA5427 / UA540$305.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14United AirlinesUA1204 + UA4758 / UA540$305.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14United AirlinesUA430 + UA1375 / UA540$305.002026-10-29T01:05:09Z
2026-12-08 → 2026-12-14United AirlinesUA1415 + UA5323 / UA540$305.002026-10-29T01:05:09Z

2026-12-08 → 2026-12-14 · $165.00

  • Frontier Airlines F93435: DEN 2026-12-08 14:09:00 → SFO 2026-12-08 16:02:00; nonstop; 173 minutes. Local airport times.
  • Frontier Airlines F91230: SFO 2026-12-14 06:02:00 → DEN 2026-12-14 09:40:00; nonstop; 158 minutes. Local airport times.

2026-12-08 → 2026-12-14 · $270.00

  • Southwest Airlines WN2104: DEN 2026-12-08 09:20:00 → SFO 2026-12-08 11:10:00; nonstop; 170 minutes. Local airport times.
  • Southwest Airlines WN3428: SFO 2026-12-14 08:00:00 → DEN 2026-12-14 11:30:00; nonstop; 150 minutes. Local airport times.

2026-12-08 → 2026-12-14 · $295.00

  • United Airlines UA1510: DEN 2026-12-08 17:25:00 → SFO 2026-12-08 19:11:00; nonstop; 166 minutes. Local airport times.
  • United Airlines UA540: SFO 2026-12-14 13:00:00 → DEN 2026-12-14 16:36:00; nonstop; 156 minutes. Local airport times.

2026-12-08 → 2026-12-14 · $295.00

  • Alaska Airlines AS1342 / AS1435: DEN 2026-12-08 13:54:00 → SFO 2026-12-08 18:06:00; 1 stop(s) via SAN; 312 minutes. Local airport times.
    • AS1342: DEN 2026-12-08 13:54:00 → SAN 2026-12-08 15:25:00; layover at SAN: 60 minutes.
    • AS1435: SAN 2026-12-08 16:25:00 → SFO 2026-12-08 18:06:00.
  • Southwest Airlines WN3428: SFO 2026-12-14 08:00:00 → DEN 2026-12-14 11:30:00; nonstop; 150 minutes. Local airport times.

2026-12-08 → 2026-12-14 · $345.00

  • Delta Air Lines DL1553 / DL1088: DEN 2026-12-08 12:29:00 → SFO 2026-12-08 16:14:00; 1 stop(s) via SLC; 285 minutes. Local airport times.
    • DL1553: DEN 2026-12-08 12:29:00 → SLC 2026-12-08 14:06:00; layover at SLC: 64 minutes.
    • DL1088: SLC 2026-12-08 15:10:00 → SFO 2026-12-08 16:14:00.
  • Delta Air Lines DL1088 / DL1667: SFO 2026-12-14 17:15:00 → DEN 2026-12-14 23:09:00; 1 stop(s) via SLC; 294 minutes. Local airport times.
    • DL1088: SFO 2026-12-14 17:15:00 → SLC 2026-12-14 20:05:00; layover at SLC: 90 minutes.
    • DL1667: SLC 2026-12-14 21:35:00 → DEN 2026-12-14 23:09:00.

2026-12-08 → 2026-12-14 · $165.00

  • Frontier Airlines F93439: DEN 2026-12-08 22:29:00 → SFO 2026-12-09 00:20:00; nonstop; 171 minutes. Local airport times.
  • Frontier Airlines F91230: SFO 2026-12-14 06:02:00 → DEN 2026-12-14 09:40:00; nonstop; 158 minutes. Local airport times.

2026-12-08 → 2026-12-14 · $270.00

  • Southwest Airlines WN1817: DEN 2026-12-08 17:35:00 → SFO 2026-12-08 19:20:00; nonstop; 165 minutes. Local airport times.
  • Southwest Airlines WN3428: SFO 2026-12-14 08:00:00 → DEN 2026-12-14 11:30:00; nonstop; 150 minutes. Local airport times.

2026-12-08 → 2026-12-14 · $295.00

  • United Airlines UA2367: DEN 2026-12-08 05:00:00 → SFO 2026-12-08 06:48:00; nonstop; 168 minutes. Local airport times.
  • United Airlines UA540: SFO 2026-12-14 13:00:00 → DEN 2026-12-14 16:36:00; nonstop; 156 minutes. Local airport times.

2026-12-08 → 2026-12-14 · $305.00

  • United Airlines UA335 / UA5427: DEN 2026-12-08 11:25:00 → SFO 2026-12-08 15:27:00; 1 stop(s) via FAT; 302 minutes. Local airport times.
    • UA335: DEN 2026-12-08 11:25:00 → FAT 2026-12-08 13:01:00; layover at FAT: 74 minutes.
    • UA5427: FAT 2026-12-08 14:15:00 → SFO 2026-12-08 15:27:00.
  • United Airlines UA540: SFO 2026-12-14 13:00:00 → DEN 2026-12-14 16:36:00; nonstop; 156 minutes. Local airport times.

2026-12-08 → 2026-12-14 · $305.00

  • United Airlines UA1204 / UA4758: DEN 2026-12-08 11:22:00 → SFO 2026-12-08 15:21:00; 1 stop(s) via MRY; 299 minutes. Local airport times.
    • UA1204: DEN 2026-12-08 11:22:00 → MRY 2026-12-08 13:03:00; layover at MRY: 82 minutes.
    • UA4758: MRY 2026-12-08 14:25:00 → SFO 2026-12-08 15:21:00.
  • United Airlines UA540: SFO 2026-12-14 13:00:00 → DEN 2026-12-14 16:36:00; nonstop; 156 minutes. Local airport times.

2026-12-08 → 2026-12-14 · $305.00

  • United Airlines UA430 / UA1375: DEN 2026-12-08 11:15:00 → SFO 2026-12-08 15:05:00; 1 stop(s) via ONT; 290 minutes. Local airport times.
    • UA430: DEN 2026-12-08 11:15:00 → ONT 2026-12-08 12:33:00; layover at ONT: 62 minutes.
    • UA1375: ONT 2026-12-08 13:35:00 → SFO 2026-12-08 15:05:00.
  • United Airlines UA540: SFO 2026-12-14 13:00:00 → DEN 2026-12-14 16:36:00; nonstop; 156 minutes. Local airport times.

2026-12-08 → 2026-12-14 · $305.00

  • United Airlines UA1415 / UA5323: DEN 2026-12-08 11:16:00 → SFO 2026-12-08 15:29:00; 1 stop(s) via SMF; 313 minutes. Local airport times.
    • UA1415: DEN 2026-12-08 11:16:00 → SMF 2026-12-08 13:01:00; layover at SMF: 74 minutes.
    • UA5323: SMF 2026-12-08 14:15:00 → SFO 2026-12-08 15:29:00.
  • United Airlines UA540: SFO 2026-12-14 13:00:00 → DEN 2026-12-14 16:36:00; nonstop; 156 minutes. Local airport times.

More dates for this route