Travel with Axel,
get the best price.

Philadelphia → Denver

May 29, 2027 · return Jun 5, 2027

PHL → DEN1 adulteconomyRound trip

13 flight options · 5 airlines

Nonstop flights

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

Southwest Airlines
5:00 amPHL
4h 15m
Nonstop
7:15 amDEN
Southwest Airlines
5:30 pmDEN
3h 20m
Nonstop
10:50 pmPHL

Round-trip total · 1 adult · Taxes included

Sat, May 29 – Sat, Jun 5

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

Round-trip total · 1 adult · Taxes included

Sat, May 29 – Sat, Jun 5

United Airlines
9:45 amPHL
4h 27m
Nonstop
12:12 pmDEN
United Airlines
11:59 pmDEN
3h 32m
Nonstop
5:31 am+1PHL

Round-trip total · 1 adult · Taxes included

One-stop flights

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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

Sat, May 29 – Sat, Jun 5

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 routeNov 5, 2026 → Nov 8, 2026Nov 14, 2026 → Nov 21, 2026Nov 24, 2026 → Nov 29, 2026Dec 5, 2026 → Dec 12, 2026Dec 17, 2026 → Dec 20, 2026Dec 26, 2026 → Jan 2, 2027Jan 5, 2027 · One wayJan 16, 2027 → Jan 23, 2027Feb 5, 2027 → Feb 8, 2027Apr 3, 2027 → Apr 10, 2027Jun 26, 2027 → Jul 3, 2027Sep 17, 2027 → Sep 20, 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.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2027-05-29 → 2027-06-05Frontier AirlinesF91876 / F91776$225.752026-10-29T01:55:41Z
2027-05-29 → 2027-06-05Southwest AirlinesWN1270 / WN1622$376.252026-10-29T01:55:41Z
2027-05-29 → 2027-06-05American AirlinesAA1003 / AA1121$392.382026-10-29T01:55:41Z
2027-05-29 → 2027-06-05United AirlinesUA2411 / UA1218$403.132026-10-29T01:55:41Z
2027-05-29 → 2027-06-05Delta Air LinesDL2791 + DL2849 / DL346 + DL1329$413.882026-10-29T01:55:41Z
2027-05-29 → 2027-06-05Southwest AirlinesWN3367 / WN1622$376.252026-10-29T01:55:41Z
2027-05-29 → 2027-06-05American AirlinesAA1313 / AA1121$392.382026-10-29T01:55:41Z
2027-05-29 → 2027-06-05United AirlinesUA1537 / UA1218$403.132026-10-29T01:55:41Z
2027-05-29 → 2027-06-05Frontier AirlinesF91876 / F93566 + F92022$240.752026-10-29T01:55:41Z
2027-05-29 → 2027-06-05Southwest AirlinesWN2080 + WN237 / WN1622$364.752026-10-29T01:55:41Z
2027-05-29 → 2027-06-05Southwest AirlinesWN2200 + WN4606 / WN1622$364.752026-10-29T01:55:41Z
2027-05-29 → 2027-06-05Southwest AirlinesWN1424 + WN4143 / WN1622$364.752026-10-29T01:55:41Z
2027-05-29 → 2027-06-05Southwest AirlinesWN266 + WN528 / WN1622$364.752026-10-29T01:55:41Z

2027-05-29 → 2027-06-05 · $225.75

  • Frontier Airlines F91876: PHL 2027-05-29 20:19:00 → DEN 2027-05-29 22:36:00; nonstop; 257 minutes. Local airport times.
  • Frontier Airlines F91776: DEN 2027-06-05 23:31:00 → PHL 2027-06-06 05:11:00; nonstop; 220 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $376.25

  • Southwest Airlines WN1270: PHL 2027-05-29 17:15:00 → DEN 2027-05-29 19:25:00; nonstop; 250 minutes. Local airport times.
  • Southwest Airlines WN1622: DEN 2027-06-05 17:30:00 → PHL 2027-06-05 22:50:00; nonstop; 200 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $392.38

  • American Airlines AA1003: PHL 2027-05-29 19:10:00 → DEN 2027-05-29 21:47:00; nonstop; 277 minutes. Local airport times.
  • American Airlines AA1121: DEN 2027-06-05 15:04:00 → PHL 2027-06-05 20:34:00; nonstop; 210 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $403.13

  • United Airlines UA2411: PHL 2027-05-29 15:25:00 → DEN 2027-05-29 17:45:00; nonstop; 260 minutes. Local airport times.
  • United Airlines UA1218: DEN 2027-06-05 23:59:00 → PHL 2027-06-06 05:31:00; nonstop; 212 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $413.88

  • Delta Air Lines DL2791 / DL2849: PHL 2027-05-29 05:34:00 → DEN 2027-05-29 10:03:00; 1 stop(s) via MSP; 389 minutes. Local airport times.
    • DL2791: PHL 2027-05-29 05:34:00 → MSP 2027-05-29 07:35:00; layover at MSP: 75 minutes.
    • DL2849: MSP 2027-05-29 08:50:00 → DEN 2027-05-29 10:03:00.
  • Delta Air Lines DL346 / DL1329: DEN 2027-06-05 10:46:00 → PHL 2027-06-05 18:32:00; 1 stop(s) via ATL; 346 minutes. Local airport times.
    • DL346: DEN 2027-06-05 10:46:00 → ATL 2027-06-05 15:33:00; layover at ATL: 61 minutes.
    • DL1329: ATL 2027-06-05 16:34:00 → PHL 2027-06-05 18:32:00.

2027-05-29 → 2027-06-05 · $376.25

  • Southwest Airlines WN3367: PHL 2027-05-29 05:00:00 → DEN 2027-05-29 07:15:00; nonstop; 255 minutes. Local airport times.
  • Southwest Airlines WN1622: DEN 2027-06-05 17:30:00 → PHL 2027-06-05 22:50:00; nonstop; 200 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $392.38

  • American Airlines AA1313: PHL 2027-05-29 08:55:00 → DEN 2027-05-29 11:21:00; nonstop; 266 minutes. Local airport times.
  • American Airlines AA1121: DEN 2027-06-05 15:04:00 → PHL 2027-06-05 20:34:00; nonstop; 210 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $403.13

  • United Airlines UA1537: PHL 2027-05-29 09:45:00 → DEN 2027-05-29 12:12:00; nonstop; 267 minutes. Local airport times.
  • United Airlines UA1218: DEN 2027-06-05 23:59:00 → PHL 2027-06-06 05:31:00; nonstop; 212 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $240.75

  • Frontier Airlines F91876: PHL 2027-05-29 20:38:00 → DEN 2027-05-29 23:04:00; nonstop; 266 minutes. Local airport times.
  • Frontier Airlines F93566 / F92022: DEN 2027-06-05 08:59:00 → PHL 2027-06-05 16:43:00; 1 stop(s) via DTW; 344 minutes. Local airport times.
    • F93566: DEN 2027-06-05 08:59:00 → DTW 2027-06-05 13:48:00; layover at DTW: 73 minutes.
    • F92022: DTW 2027-06-05 15:01:00 → PHL 2027-06-05 16:43:00.

2027-05-29 → 2027-06-05 · $364.75

  • Southwest Airlines WN2080 / WN237: PHL 2027-05-29 14:55:00 → DEN 2027-05-29 19:25:00; 1 stop(s) via BNA; 390 minutes. Local airport times.
    • WN2080: PHL 2027-05-29 14:55:00 → BNA 2027-05-29 16:10:00; layover at BNA: 85 minutes.
    • WN237: BNA 2027-05-29 17:35:00 → DEN 2027-05-29 19:25:00.
  • Southwest Airlines WN1622: DEN 2027-06-05 17:30:00 → PHL 2027-06-05 22:50:00; nonstop; 200 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $364.75

  • Southwest Airlines WN2200 / WN4606: PHL 2027-05-29 11:45:00 → DEN 2027-05-29 16:15:00; 1 stop(s) via MDW; 390 minutes. Local airport times.
    • WN2200: PHL 2027-05-29 11:45:00 → MDW 2027-05-29 13:00:00; layover at MDW: 95 minutes.
    • WN4606: MDW 2027-05-29 14:35:00 → DEN 2027-05-29 16:15:00.
  • Southwest Airlines WN1622: DEN 2027-06-05 17:30:00 → PHL 2027-06-05 22:50:00; nonstop; 200 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $364.75

  • Southwest Airlines WN1424 / WN4143: PHL 2027-05-29 14:45:00 → DEN 2027-05-29 19:10:00; 1 stop(s) via STL; 385 minutes. Local airport times.
    • WN1424: PHL 2027-05-29 14:45:00 → STL 2027-05-29 16:20:00; layover at STL: 85 minutes.
    • WN4143: STL 2027-05-29 17:45:00 → DEN 2027-05-29 19:10:00.
  • Southwest Airlines WN1622: DEN 2027-06-05 17:30:00 → PHL 2027-06-05 22:50:00; nonstop; 200 minutes. Local airport times.

2027-05-29 → 2027-06-05 · $364.75

  • Southwest Airlines WN266 / WN528: PHL 2027-05-29 17:05:00 → DEN 2027-05-29 22:10:00; 1 stop(s) via DAL; 425 minutes. Local airport times.
    • WN266: PHL 2027-05-29 17:05:00 → DAL 2027-05-29 19:30:00; layover at DAL: 95 minutes.
    • WN528: DAL 2027-05-29 21:05:00 → DEN 2027-05-29 22:10:00.
  • Southwest Airlines WN1622: DEN 2027-06-05 17:30:00 → PHL 2027-06-05 22:50:00; nonstop; 200 minutes. Local airport times.

More dates for this route