Travel with Axel,
get the best price.

Denver → Philadelphia

Dec 19, 2026 · return Dec 26, 2026

DEN → PHL1 adulteconomyRound trip

12 flight options · 5 airlines

Nonstop flights

Sat, Dec 19 – Sat, Dec 26

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

Round-trip total · 1 adult · Taxes included

Sat, Dec 19 – Sat, Dec 26

Southwest Airlines
7:30 pmDEN
3h 25m
Nonstop
12:55 am+1PHL
Southwest Airlines
5:15 pmPHL
4h 10m
Nonstop
7:25 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 19 – Sat, Dec 26

American Airlines
3:04 pmDEN
3h 30m
Nonstop
8:34 pmPHL
American Airlines
8:55 amPHL
4h 26m
Nonstop
11:21 amDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 19 – Sat, Dec 26

United Airlines
5:25 pmDEN
3h 34m
Nonstop
10:59 pmPHL
United Airlines
3:25 pmPHL
4h 20m
Nonstop
5:45 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 19 – Sat, Dec 26

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

Round-trip total · 1 adult · Taxes included

Sat, Dec 19 – Sat, Dec 26

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

Round-trip total · 1 adult · Taxes included

One-stop flights

Sat, Dec 19 – Sat, Dec 26

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

Round-trip total · 1 adult · Taxes included

Sat, Dec 19 – Sat, Dec 26

Frontier Airlines
11:59 pmDEN
3h 26m
Nonstop
5:25 am+1PHL
Frontier Airlines
4:38 pmPHL
7h 19m
ATL · 1h 10m
9:57 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 19 – Sat, Dec 26

Frontier Airlines
8:59 amDEN
5h 44m
DTW · 1h 13m
4:43 pmPHL
Frontier Airlines
8:19 pmPHL
4h 17m
Nonstop
10:36 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 19 – Sat, Dec 26

Southwest Airlines
8:45 amDEN
5h 55m
MDW · 1h 40m
4:40 pmPHL
Southwest Airlines
5:15 pmPHL
4h 10m
Nonstop
7:25 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 19 – Sat, Dec 26

Southwest Airlines
3:40 pmDEN
5h 40m
STL · 1h 35m
11:20 pmPHL
Southwest Airlines
5:15 pmPHL
4h 10m
Nonstop
7:25 pmDEN

Round-trip total · 1 adult · Taxes included

Sat, Dec 19 – Sat, Dec 26

Southwest Airlines
2:25 pmDEN
5h 45m
BNA · 1h 20m
10:10 pmPHL
Southwest Airlines
5:15 pmPHL
4h 10m
Nonstop
7:25 pmDEN

Round-trip total · 1 adult · Taxes included

Make this trip yours

DEN ⇄ PHL

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)
2026-12-19 → 2026-12-26Frontier AirlinesF91776 / F91876$234.002026-10-29T01:04:33Z
2026-12-19 → 2026-12-26Southwest AirlinesWN1010 / WN1270$409.502026-10-29T01:04:33Z
2026-12-19 → 2026-12-26American AirlinesAA1121 / AA1313$429.002026-10-29T01:04:33Z
2026-12-19 → 2026-12-26United AirlinesUA2447 / UA2411$442.002026-10-29T01:04:33Z
2026-12-19 → 2026-12-26Delta Air LinesDL346 + DL1329 / DL2791 + DL2849$455.002026-10-29T01:04:33Z
2026-12-19 → 2026-12-26Southwest AirlinesWN1622 / WN1270$409.502026-10-29T01:04:33Z
2026-12-19 → 2026-12-26United AirlinesUA1218 / UA2411$442.002026-10-29T01:04:33Z
2026-12-19 → 2026-12-26Frontier AirlinesF91776 / F91101 + F93599$247.002026-10-29T01:04:33Z
2026-12-19 → 2026-12-26Frontier AirlinesF93566 + F92022 / F91876$247.002026-10-29T01:04:33Z
2026-12-19 → 2026-12-26Southwest AirlinesWN1697 + WN333 / WN1270$403.002026-10-29T01:04:33Z
2026-12-19 → 2026-12-26Southwest AirlinesWN2170 + WN4923 / WN1270$403.002026-10-29T01:04:33Z
2026-12-19 → 2026-12-26Southwest AirlinesWN1573 + WN2825 / WN1270$403.002026-10-29T01:04:33Z

2026-12-19 → 2026-12-26 · $234.00

  • Frontier Airlines F91776: DEN 2026-12-19 23:31:00 → PHL 2026-12-20 05:11:00; nonstop; 220 minutes. Local airport times.
  • Frontier Airlines F91876: PHL 2026-12-26 20:19:00 → DEN 2026-12-26 22:36:00; nonstop; 257 minutes. Local airport times.

2026-12-19 → 2026-12-26 · $409.50

  • Southwest Airlines WN1010: DEN 2026-12-19 19:30:00 → PHL 2026-12-20 00:55:00; nonstop; 205 minutes. Local airport times.
  • Southwest Airlines WN1270: PHL 2026-12-26 17:15:00 → DEN 2026-12-26 19:25:00; nonstop; 250 minutes. Local airport times.

2026-12-19 → 2026-12-26 · $429.00

  • American Airlines AA1121: DEN 2026-12-19 15:04:00 → PHL 2026-12-19 20:34:00; nonstop; 210 minutes. Local airport times.
  • American Airlines AA1313: PHL 2026-12-26 08:55:00 → DEN 2026-12-26 11:21:00; nonstop; 266 minutes. Local airport times.

2026-12-19 → 2026-12-26 · $442.00

  • United Airlines UA2447: DEN 2026-12-19 17:25:00 → PHL 2026-12-19 22:59:00; nonstop; 214 minutes. Local airport times.
  • United Airlines UA2411: PHL 2026-12-26 15:25:00 → DEN 2026-12-26 17:45:00; nonstop; 260 minutes. Local airport times.

2026-12-19 → 2026-12-26 · $455.00

  • 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.
  • Delta Air Lines DL2791 / DL2849: PHL 2026-12-26 05:34:00 → DEN 2026-12-26 10:03:00; 1 stop(s) via MSP; 389 minutes. Local airport times.
    • DL2791: PHL 2026-12-26 05:34:00 → MSP 2026-12-26 07:35:00; layover at MSP: 75 minutes.
    • DL2849: MSP 2026-12-26 08:50:00 → DEN 2026-12-26 10:03:00.

2026-12-19 → 2026-12-26 · $409.50

  • Southwest Airlines WN1622: DEN 2026-12-19 17:30:00 → PHL 2026-12-19 22:50:00; nonstop; 200 minutes. Local airport times.
  • Southwest Airlines WN1270: PHL 2026-12-26 17:15:00 → DEN 2026-12-26 19:25:00; nonstop; 250 minutes. Local airport times.

2026-12-19 → 2026-12-26 · $442.00

  • United Airlines UA1218: DEN 2026-12-19 23:59:00 → PHL 2026-12-20 05:31:00; nonstop; 212 minutes. Local airport times.
  • United Airlines UA2411: PHL 2026-12-26 15:25:00 → DEN 2026-12-26 17:45:00; nonstop; 260 minutes. Local airport times.

2026-12-19 → 2026-12-26 · $247.00

  • Frontier Airlines F91776: DEN 2026-12-19 23:59:00 → PHL 2026-12-20 05:25:00; nonstop; 206 minutes. Local airport times.
  • Frontier Airlines F91101 / F93599: PHL 2026-12-26 16:38:00 → DEN 2026-12-26 21:57:00; 1 stop(s) via ATL; 439 minutes. Local airport times.
    • F91101: PHL 2026-12-26 16:38:00 → ATL 2026-12-26 19:04:00; layover at ATL: 70 minutes.
    • F93599: ATL 2026-12-26 20:14:00 → DEN 2026-12-26 21:57:00.

2026-12-19 → 2026-12-26 · $247.00

  • 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.
  • Frontier Airlines F91876: PHL 2026-12-26 20:19:00 → DEN 2026-12-26 22:36:00; nonstop; 257 minutes. Local airport times.

2026-12-19 → 2026-12-26 · $403.00

  • Southwest Airlines WN1697 / WN333: DEN 2026-12-19 08:45:00 → PHL 2026-12-19 16:40:00; 1 stop(s) via MDW; 355 minutes. Local airport times.
    • WN1697: DEN 2026-12-19 08:45:00 → MDW 2026-12-19 12:05:00; layover at MDW: 100 minutes.
    • WN333: MDW 2026-12-19 13:45:00 → PHL 2026-12-19 16:40:00.
  • Southwest Airlines WN1270: PHL 2026-12-26 17:15:00 → DEN 2026-12-26 19:25:00; nonstop; 250 minutes. Local airport times.

2026-12-19 → 2026-12-26 · $403.00

  • Southwest Airlines WN2170 / WN4923: DEN 2026-12-19 15:40:00 → PHL 2026-12-19 23:20:00; 1 stop(s) via STL; 340 minutes. Local airport times.
    • WN2170: DEN 2026-12-19 15:40:00 → STL 2026-12-19 18:35:00; layover at STL: 95 minutes.
    • WN4923: STL 2026-12-19 20:10:00 → PHL 2026-12-19 23:20:00.
  • Southwest Airlines WN1270: PHL 2026-12-26 17:15:00 → DEN 2026-12-26 19:25:00; nonstop; 250 minutes. Local airport times.

2026-12-19 → 2026-12-26 · $403.00

  • Southwest Airlines WN1573 / WN2825: DEN 2026-12-19 14:25:00 → PHL 2026-12-19 22:10:00; 1 stop(s) via BNA; 345 minutes. Local airport times.
    • WN1573: DEN 2026-12-19 14:25:00 → BNA 2026-12-19 17:45:00; layover at BNA: 80 minutes.
    • WN2825: BNA 2026-12-19 19:05:00 → PHL 2026-12-19 22:10:00.
  • Southwest Airlines WN1270: PHL 2026-12-26 17:15:00 → DEN 2026-12-26 19:25:00; nonstop; 250 minutes. Local airport times.

More dates for this route