Travel with Axel,
get the best price.

Saint Louis → Philadelphia

Jan 21, 2027 · return Jan 22, 2027

STL → PHL1 adulteconomyRound trip

8 flight options · 6 airlines

Nonstop flights

Thu, Jan 21 – Fri, Jan 22

Southwest Airlines
10:40 amSTL
2h 10m
Nonstop
1:50 pmPHL
Southwest Airlines
2:45 pmPHL
2h 35m
Nonstop
4:20 pmSTL

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Fri, Jan 22

Southwest Airlines
7:55 pmSTL
2h 10m
Nonstop
11:05 pmPHL
Southwest Airlines
2:45 pmPHL
2h 35m
Nonstop
4:20 pmSTL

Round-trip total · 1 adult · Taxes included

One-stop flights

Thu, Jan 21 – Fri, Jan 22

Frontier Airlines
12:02 pmSTL
5h 30m
ATL · 1h 42m
6:32 pmPHL
Frontier Airlines
12:49 pmPHL
5h 53m
ATL · 1h 30m
5:42 pmSTL

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Fri, Jan 22

United Airlines
1:23 pmSTL
4h 39m
IAD · 1h 17m
7:02 pmPHL
United Airlines
3:05 pmPHL
5h 30m
IAD · 1h 42m
7:35 pmSTL

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Fri, Jan 22

American Airlines
1:17 pmSTL
2h 16m
Nonstop
4:33 pmPHL
American Airlines
3:06 pmPHL
5h 24m
CLT · 1h 23m
7:30 pmSTL

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Fri, Jan 22

Delta Air Lines
10:14 amSTL
5h 21m
DTW · 2h 13m
4:35 pmPHL
Delta Air Lines
9:43 amPHL
4h 47m
DTW · 1h 8m
1:30 pmSTL

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Fri, Jan 22

Air Canada
4:05 pmSTL
5h 41m
YYZ · 2h 5m
10:46 pmPHL
Southwest Airlines
2:45 pmPHL
2h 35m
Nonstop
4:20 pmSTL

Round-trip total · 1 adult · Taxes included

Thu, Jan 21 – Fri, Jan 22

Southwest Airlines
5:30 amSTL
4h 15m
MDW · 1h 10m
10:45 amPHL
Southwest Airlines
2:45 pmPHL
2h 35m
Nonstop
4:20 pmSTL

Round-trip total · 1 adult · Taxes included

Make this trip yours

STL ⇄ 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, Southwest 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)
2027-01-21 → 2027-01-22Southwest AirlinesWN4922 / WN1424$313.502026-10-29T01:28:56Z
2027-01-21 → 2027-01-22Frontier AirlinesF94474 + F92298 / F91147 + F94473$185.262026-10-29T01:28:56Z
2027-01-21 → 2027-01-22United AirlinesUA3495 + UA4405 / UA4575 + UA4527$308.762026-10-29T01:28:56Z
2027-01-21 → 2027-01-22American AirlinesAA5477 / AA567 + AA2937$311.132026-10-29T01:28:56Z
2027-01-21 → 2027-01-22Delta Air LinesDL2868 + DL1391 / DL2968 + DL1371$313.502026-10-29T01:28:56Z
2027-01-21 → 2027-01-22Air Canada / Southwest AirlinesAC8890 + AC8520 / WN1424$372.882026-10-29T01:28:56Z
2027-01-21 → 2027-01-22Southwest AirlinesWN4923 / WN1424$313.502026-10-29T01:28:56Z
2027-01-21 → 2027-01-22Southwest AirlinesWN4173 + WN1082 / WN1424$292.132026-10-29T01:28:56Z

2027-01-21 → 2027-01-22 · $313.50

  • Southwest Airlines WN4922: STL 2027-01-21 10:40:00 → PHL 2027-01-21 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN1424: PHL 2027-01-22 14:45:00 → STL 2027-01-22 16:20:00; nonstop; 155 minutes. Local airport times.

2027-01-21 → 2027-01-22 · $185.26

  • Frontier Airlines F94474 / F92298: STL 2027-01-21 12:02:00 → PHL 2027-01-21 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-01-21 12:02:00 → ATL 2027-01-21 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-01-21 16:24:00 → PHL 2027-01-21 18:32:00.
  • Frontier Airlines F91147 / F94473: PHL 2027-01-22 12:49:00 → STL 2027-01-22 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-01-22 12:49:00 → ATL 2027-01-22 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-01-22 16:49:00 → STL 2027-01-22 17:42:00.

2027-01-21 → 2027-01-22 · $308.76

  • United Airlines UA3495 / UA4405: STL 2027-01-21 13:23:00 → PHL 2027-01-21 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2027-01-21 13:23:00 → IAD 2027-01-21 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2027-01-21 17:50:00 → PHL 2027-01-21 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2027-01-22 15:05:00 → STL 2027-01-22 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2027-01-22 15:05:00 → IAD 2027-01-22 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2027-01-22 18:00:00 → STL 2027-01-22 19:35:00.

2027-01-21 → 2027-01-22 · $311.13

  • American Airlines AA5477: STL 2027-01-21 13:17:00 → PHL 2027-01-21 16:33:00; nonstop; 136 minutes. Local airport times.
  • American Airlines AA567 / AA2937: PHL 2027-01-22 15:06:00 → STL 2027-01-22 19:30:00; 1 stop(s) via CLT; 324 minutes. Local airport times.
    • AA567: PHL 2027-01-22 15:06:00 → CLT 2027-01-22 17:04:00; layover at CLT: 83 minutes.
    • AA2937: CLT 2027-01-22 18:27:00 → STL 2027-01-22 19:30:00.

2027-01-21 → 2027-01-22 · $313.50

  • Delta Air Lines DL2868 / DL1391: STL 2027-01-21 10:14:00 → PHL 2027-01-21 16:35:00; 1 stop(s) via DTW; 321 minutes. Local airport times.
    • DL2868: STL 2027-01-21 10:14:00 → DTW 2027-01-21 12:46:00; layover at DTW: 133 minutes.
    • DL1391: DTW 2027-01-21 14:59:00 → PHL 2027-01-21 16:35:00.
  • Delta Air Lines DL2968 / DL1371: PHL 2027-01-22 09:43:00 → STL 2027-01-22 13:30:00; 1 stop(s) via DTW; 287 minutes. Local airport times.
    • DL2968: PHL 2027-01-22 09:43:00 → DTW 2027-01-22 11:35:00; layover at DTW: 68 minutes.
    • DL1371: DTW 2027-01-22 12:43:00 → STL 2027-01-22 13:30:00.

2027-01-21 → 2027-01-22 · $372.88

  • Air Canada AC8890 / AC8520: STL 2027-01-21 16:05:00 → PHL 2027-01-21 22:46:00; 1 stop(s) via YYZ; 341 minutes. Local airport times.
    • AC8890: STL 2027-01-21 16:05:00 → YYZ 2027-01-21 19:05:00; layover at YYZ: 125 minutes.
    • AC8520: YYZ 2027-01-21 21:10:00 → PHL 2027-01-21 22:46:00.
  • Southwest Airlines WN1424: PHL 2027-01-22 14:45:00 → STL 2027-01-22 16:20:00; nonstop; 155 minutes. Local airport times.

2027-01-21 → 2027-01-22 · $313.50

  • Southwest Airlines WN4923: STL 2027-01-21 19:55:00 → PHL 2027-01-21 23:05:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN1424: PHL 2027-01-22 14:45:00 → STL 2027-01-22 16:20:00; nonstop; 155 minutes. Local airport times.

2027-01-21 → 2027-01-22 · $292.13

  • Southwest Airlines WN4173 / WN1082: STL 2027-01-21 05:30:00 → PHL 2027-01-21 10:45:00; 1 stop(s) via MDW; 255 minutes. Local airport times.
    • WN4173: STL 2027-01-21 05:30:00 → MDW 2027-01-21 06:35:00; layover at MDW: 70 minutes.
    • WN1082: MDW 2027-01-21 07:45:00 → PHL 2027-01-21 10:45:00.
  • Southwest Airlines WN1424: PHL 2027-01-22 14:45:00 → STL 2027-01-22 16:20:00; nonstop; 155 minutes. Local airport times.

More dates for this route