Travel with Axel,
get the best price.

Philadelphia → Denver

Dec 16, 2026 · return Dec 19, 2026

PHL → DEN1 adulteconomyRound trip

13 flight options · 5 airlines

Nonstop flights

Wed, Dec 16 – Sat, Dec 19

Frontier Airlines
8:19 pmPHL
4h 17m
Nonstop
10:36 pmDEN
Frontier Airlines
11:31 pmDEN
3h 40m
Nonstop
5:11 am+1PHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

Southwest Airlines
5:00 amPHL
4h 20m
Nonstop
7:20 amDEN
Southwest Airlines
5:30 pmDEN
3h 20m
Nonstop
10:50 pmPHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

American Airlines
8:42 amPHL
4h 31m
Nonstop
11:13 amDEN
American Airlines
3:04 pmDEN
3h 30m
Nonstop
8:34 pmPHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

United Airlines
7:45 amPHL
4h 20m
Nonstop
10:05 amDEN
United Airlines
11:59 pmDEN
3h 32m
Nonstop
5:31 am+1PHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

Southwest Airlines
5:15 pmPHL
4h 10m
Nonstop
7:25 pmDEN
Southwest Airlines
5:30 pmDEN
3h 20m
Nonstop
10:50 pmPHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

American Airlines
7:10 pmPHL
4h 37m
Nonstop
9:47 pmDEN
American Airlines
3:04 pmDEN
3h 30m
Nonstop
8:34 pmPHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

United Airlines
3:25 pmPHL
4h 20m
Nonstop
5:45 pmDEN
United Airlines
11:59 pmDEN
3h 32m
Nonstop
5:31 am+1PHL

Round-trip total · 1 adult · Taxes included

One-stop flights

Wed, Dec 16 – Sat, Dec 19

Delta Air Lines
5:34 amPHL
6h 29m
MSP · 1h 15m
10:03 amDEN
Delta Air Lines
10:46 amDEN
5h 46m
ATL · 1h 1m
6:32 pmPHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

Frontier Airlines
8:38 pmPHL
4h 26m
Nonstop
11:04 pmDEN
Frontier Airlines
8:59 amDEN
5h 44m
DTW · 1h 13m
4:43 pmPHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

Southwest Airlines
11:45 amPHL
6h 30m
MDW · 1h 35m
4:15 pmDEN
Southwest Airlines
5:30 pmDEN
3h 20m
Nonstop
10:50 pmPHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

Southwest Airlines
2:45 pmPHL
6h 25m
STL · 1h 25m
7:10 pmDEN
Southwest Airlines
5:30 pmDEN
3h 20m
Nonstop
10:50 pmPHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

Southwest Airlines
2:55 pmPHL
6h 30m
BNA · 1h 25m
7:25 pmDEN
Southwest Airlines
5:30 pmDEN
3h 20m
Nonstop
10:50 pmPHL

Round-trip total · 1 adult · Taxes included

Wed, Dec 16 – Sat, Dec 19

Southwest Airlines
5:05 pmPHL
7h 5m
DAL · 1h 35m
10:10 pmDEN
Southwest Airlines
5:30 pmDEN
3h 20m
Nonstop
10:50 pmPHL

Round-trip total · 1 adult · Taxes included

Make this trip yours

PHL ⇄ 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)
2026-12-16 → 2026-12-19Frontier AirlinesF91876 / F91776$192.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19Southwest AirlinesWN1639 / WN1622$354.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19American AirlinesAA1313 / AA1121$372.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19United AirlinesUA323 / UA1218$384.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19Delta Air LinesDL2791 + DL2849 / DL346 + DL1329$396.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19Southwest AirlinesWN1270 / WN1622$354.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19American AirlinesAA1003 / AA1121$372.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19United AirlinesUA2411 / UA1218$384.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19Frontier AirlinesF91876 / F93566 + F92022$213.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19Southwest AirlinesWN2200 + WN4606 / WN1622$344.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19Southwest AirlinesWN1424 + WN4143 / WN1622$344.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19Southwest AirlinesWN2080 + WN237 / WN1622$344.002026-10-29T01:55:41Z
2026-12-16 → 2026-12-19Southwest AirlinesWN266 + WN528 / WN1622$344.002026-10-29T01:55:41Z

2026-12-16 → 2026-12-19 · $192.00

  • Frontier Airlines F91876: PHL 2026-12-16 20:19:00 → DEN 2026-12-16 22:36:00; nonstop; 257 minutes. Local airport times.
  • Frontier Airlines F91776: DEN 2026-12-19 23:31:00 → PHL 2026-12-20 05:11:00; nonstop; 220 minutes. Local airport times.

2026-12-16 → 2026-12-19 · $354.00

  • Southwest Airlines WN1639: PHL 2026-12-16 05:00:00 → DEN 2026-12-16 07:20:00; nonstop; 260 minutes. Local airport times.
  • Southwest Airlines WN1622: DEN 2026-12-19 17:30:00 → PHL 2026-12-19 22:50:00; nonstop; 200 minutes. Local airport times.

2026-12-16 → 2026-12-19 · $372.00

  • American Airlines AA1313: PHL 2026-12-16 08:42:00 → DEN 2026-12-16 11:13:00; nonstop; 271 minutes. Local airport times.
  • American Airlines AA1121: DEN 2026-12-19 15:04:00 → PHL 2026-12-19 20:34:00; nonstop; 210 minutes. Local airport times.

2026-12-16 → 2026-12-19 · $384.00

  • United Airlines UA323: PHL 2026-12-16 07:45:00 → DEN 2026-12-16 10:05:00; nonstop; 260 minutes. Local airport times.
  • United Airlines UA1218: DEN 2026-12-19 23:59:00 → PHL 2026-12-20 05:31:00; nonstop; 212 minutes. Local airport times.

2026-12-16 → 2026-12-19 · $396.00

  • Delta Air Lines DL2791 / DL2849: PHL 2026-12-16 05:34:00 → DEN 2026-12-16 10:03:00; 1 stop(s) via MSP; 389 minutes. Local airport times.
    • DL2791: PHL 2026-12-16 05:34:00 → MSP 2026-12-16 07:35:00; layover at MSP: 75 minutes.
    • DL2849: MSP 2026-12-16 08:50:00 → DEN 2026-12-16 10:03:00.
  • Delta Air Lines DL346 / DL1329: DEN 2026-12-19 10:46:00 → PHL 2026-12-19 18:32:00; 1 stop(s) via ATL; 346 minutes. Local airport times.
    • DL346: DEN 2026-12-19 10:46:00 → ATL 2026-12-19 15:33:00; layover at ATL: 61 minutes.
    • DL1329: ATL 2026-12-19 16:34:00 → PHL 2026-12-19 18:32:00.

2026-12-16 → 2026-12-19 · $354.00

  • Southwest Airlines WN1270: PHL 2026-12-16 17:15:00 → DEN 2026-12-16 19:25:00; nonstop; 250 minutes. Local airport times.
  • Southwest Airlines WN1622: DEN 2026-12-19 17:30:00 → PHL 2026-12-19 22:50:00; nonstop; 200 minutes. Local airport times.

2026-12-16 → 2026-12-19 · $372.00

  • American Airlines AA1003: PHL 2026-12-16 19:10:00 → DEN 2026-12-16 21:47:00; nonstop; 277 minutes. Local airport times.
  • American Airlines AA1121: DEN 2026-12-19 15:04:00 → PHL 2026-12-19 20:34:00; nonstop; 210 minutes. Local airport times.

2026-12-16 → 2026-12-19 · $384.00

  • United Airlines UA2411: PHL 2026-12-16 15:25:00 → DEN 2026-12-16 17:45:00; nonstop; 260 minutes. Local airport times.
  • United Airlines UA1218: DEN 2026-12-19 23:59:00 → PHL 2026-12-20 05:31:00; nonstop; 212 minutes. Local airport times.

2026-12-16 → 2026-12-19 · $213.00

  • Frontier Airlines F91876: PHL 2026-12-16 20:38:00 → DEN 2026-12-16 23:04:00; nonstop; 266 minutes. Local airport times.
  • Frontier Airlines F93566 / F92022: DEN 2026-12-19 08:59:00 → PHL 2026-12-19 16:43:00; 1 stop(s) via DTW; 344 minutes. Local airport times.
    • F93566: DEN 2026-12-19 08:59:00 → DTW 2026-12-19 13:48:00; layover at DTW: 73 minutes.
    • F92022: DTW 2026-12-19 15:01:00 → PHL 2026-12-19 16:43:00.

2026-12-16 → 2026-12-19 · $344.00

  • Southwest Airlines WN2200 / WN4606: PHL 2026-12-16 11:45:00 → DEN 2026-12-16 16:15:00; 1 stop(s) via MDW; 390 minutes. Local airport times.
    • WN2200: PHL 2026-12-16 11:45:00 → MDW 2026-12-16 13:00:00; layover at MDW: 95 minutes.
    • WN4606: MDW 2026-12-16 14:35:00 → DEN 2026-12-16 16:15:00.
  • Southwest Airlines WN1622: DEN 2026-12-19 17:30:00 → PHL 2026-12-19 22:50:00; nonstop; 200 minutes. Local airport times.

2026-12-16 → 2026-12-19 · $344.00

  • Southwest Airlines WN1424 / WN4143: PHL 2026-12-16 14:45:00 → DEN 2026-12-16 19:10:00; 1 stop(s) via STL; 385 minutes. Local airport times.
    • WN1424: PHL 2026-12-16 14:45:00 → STL 2026-12-16 16:20:00; layover at STL: 85 minutes.
    • WN4143: STL 2026-12-16 17:45:00 → DEN 2026-12-16 19:10:00.
  • Southwest Airlines WN1622: DEN 2026-12-19 17:30:00 → PHL 2026-12-19 22:50:00; nonstop; 200 minutes. Local airport times.

2026-12-16 → 2026-12-19 · $344.00

  • Southwest Airlines WN2080 / WN237: PHL 2026-12-16 14:55:00 → DEN 2026-12-16 19:25:00; 1 stop(s) via BNA; 390 minutes. Local airport times.
    • WN2080: PHL 2026-12-16 14:55:00 → BNA 2026-12-16 16:10:00; layover at BNA: 85 minutes.
    • WN237: BNA 2026-12-16 17:35:00 → DEN 2026-12-16 19:25:00.
  • Southwest Airlines WN1622: DEN 2026-12-19 17:30:00 → PHL 2026-12-19 22:50:00; nonstop; 200 minutes. Local airport times.

2026-12-16 → 2026-12-19 · $344.00

  • Southwest Airlines WN266 / WN528: PHL 2026-12-16 17:05:00 → DEN 2026-12-16 22:10:00; 1 stop(s) via DAL; 425 minutes. Local airport times.
    • WN266: PHL 2026-12-16 17:05:00 → DAL 2026-12-16 19:30:00; layover at DAL: 95 minutes.
    • WN528: DAL 2026-12-16 21:05:00 → DEN 2026-12-16 22:10:00.
  • Southwest Airlines WN1622: DEN 2026-12-19 17:30:00 → PHL 2026-12-19 22:50:00; nonstop; 200 minutes. Local airport times.

More dates for this route