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Route overview: Saint Louis to Philadelphia (PHL) flight deals

Saint Louis → Philadelphia

Dec 13, 2026 · choose your return date

STL → PHL1 adulteconomyOne way and round trips

30 flight options · 3 airlines

Choose your return date

One-way flights and round trips by duration. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

December 2026

Dec 13, 2026 · One wayUnited AirlinesUp to 1 stop each way$170.00 Dec 13, 2026 · One waySouthwest AirlinesNonstop$175.00 Dec 13, 2026 – Dec 14, 2026 · 1 nightUnited AirlinesUp to 1 stop each way$325.00 Dec 13, 2026 – Dec 14, 2026 · 1 nightSouthwest AirlinesNonstop$330.00 Dec 13, 2026 – Dec 15, 2026 · 2 nightsUnited AirlinesUp to 1 stop each way$325.00 Dec 13, 2026 – Dec 15, 2026 · 2 nightsSouthwest AirlinesNonstop$330.00 Dec 13, 2026 – Dec 16, 2026 · 3 nightsUnited AirlinesUp to 1 stop each way$325.00 Dec 13, 2026 – Dec 16, 2026 · 3 nightsSouthwest AirlinesNonstop$330.00 Dec 13, 2026 – Dec 17, 2026 · 4 nightsUnited AirlinesUp to 1 stop each way$325.00 Dec 13, 2026 – Dec 17, 2026 · 4 nightsSouthwest AirlinesNonstop$330.00 Dec 13, 2026 – Dec 18, 2026 · 5 nightsUnited AirlinesUp to 1 stop each way$325.00 Dec 13, 2026 – Dec 18, 2026 · 5 nightsSouthwest AirlinesNonstop$330.00 Dec 13, 2026 – Dec 19, 2026 · 6 nightsUnited AirlinesUp to 1 stop each way$365.63 Dec 13, 2026 – Dec 19, 2026 · 6 nightsSouthwest AirlinesNonstop$371.25 Dec 13, 2026 – Dec 20, 2026 · 7 nightsUnited AirlinesUp to 1 stop each way$365.63 Dec 13, 2026 – Dec 20, 2026 · 7 nightsSouthwest AirlinesNonstop$371.25 Dec 13, 2026 – Dec 21, 2026 · 8 nightsUnited AirlinesUp to 1 stop each way$365.63 Dec 13, 2026 – Dec 21, 2026 · 8 nightsSouthwest AirlinesNonstop$371.25 Dec 13, 2026 – Dec 22, 2026 · 9 nightsUnited AirlinesUp to 1 stop each way$365.63 Dec 13, 2026 – Dec 22, 2026 · 9 nightsSouthwest AirlinesNonstop$371.25 Dec 13, 2026 – Dec 23, 2026 · 10 nightsUnited AirlinesUp to 1 stop each way$365.63 Dec 13, 2026 – Dec 23, 2026 · 10 nightsSouthwest AirlinesNonstop$371.25 Dec 13, 2026 – Dec 24, 2026 · 11 nightsUnited AirlinesUp to 1 stop each way$365.63 Dec 13, 2026 – Dec 24, 2026 · 11 nightsSouthwest AirlinesNonstop$371.25 Dec 13, 2026 – Dec 25, 2026 · 12 nightsAmerican AirlinesUp to 1 stop each way$365.63 Dec 13, 2026 – Dec 25, 2026 · 12 nightsSouthwest AirlinesNonstop$371.25 Dec 13, 2026 – Dec 26, 2026 · 13 nightsUnited AirlinesUp to 1 stop each way$365.63 Dec 13, 2026 – Dec 26, 2026 · 13 nightsSouthwest AirlinesNonstop$371.25 Dec 13, 2026 – Dec 27, 2026 · 14 nightsUnited AirlinesUp to 1 stop each way$365.63 Dec 13, 2026 – Dec 27, 2026 · 14 nightsSouthwest AirlinesNonstop$371.25

Flights for your trip

  1. Sun, Dec 13 · One way

    United Airlines
    1:23 pmSTL
    4h 39m
    IAD · 1h 17m
    7:02 pmPHL

    One-way total · 1 adult · Taxes included

  2. Sun, Dec 13 · One way

    Southwest Airlines
    10:40 amSTL
    2h 10m
    Nonstop
    1:50 pmPHL

    One-way total · 1 adult · Taxes included

  3. Sun, Dec 13 – Mon, Dec 14

    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

  4. Sun, Dec 13 – Mon, Dec 14

    Southwest Airlines
    10:40 amSTL
    2h 10m
    Nonstop
    1:50 pmPHL
    Southwest Airlines
    5:25 amPHL
    2h 30m
    Nonstop
    6:55 amSTL

    Round-trip total · 1 adult · Taxes included

  5. Sun, Dec 13 – Tue, Dec 15

    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

  6. Sun, Dec 13 – Tue, Dec 15

    Southwest Airlines
    10:40 amSTL
    2h 10m
    Nonstop
    1:50 pmPHL
    Southwest Airlines
    5:25 amPHL
    2h 30m
    Nonstop
    6:55 amSTL

    Round-trip total · 1 adult · Taxes included

  7. Sun, Dec 13 – Wed, Dec 16

    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

  8. Sun, Dec 13 – Wed, Dec 16

    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

  9. Sun, Dec 13 – Thu, Dec 17

    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

  10. Sun, Dec 13 – Thu, Dec 17

    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

  11. Sun, Dec 13 – Sat, Dec 19

    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

  12. Sun, Dec 13 – Sat, Dec 19

    Southwest Airlines
    10:40 amSTL
    2h 10m
    Nonstop
    1:50 pmPHL
    Southwest Airlines
    5:25 amPHL
    2h 30m
    Nonstop
    6:55 amSTL

    Round-trip total · 1 adult · Taxes included

  13. Sun, Dec 13 – Sun, Dec 20

    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

  14. Sun, Dec 13 – Sun, Dec 20

    Southwest Airlines
    10:40 amSTL
    2h 10m
    Nonstop
    1:50 pmPHL
    Southwest Airlines
    5:25 amPHL
    2h 30m
    Nonstop
    6:55 amSTL

    Round-trip total · 1 adult · Taxes included

  15. Sun, Dec 13 – Mon, Dec 21

    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

  16. Sun, Dec 13 – Mon, Dec 21

    Southwest Airlines
    10:40 amSTL
    2h 10m
    Nonstop
    1:50 pmPHL
    Southwest Airlines
    5:25 amPHL
    2h 30m
    Nonstop
    6:55 amSTL

    Round-trip total · 1 adult · Taxes included

  17. Sun, Dec 13 – Wed, Dec 23

    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

  18. Sun, Dec 13 – Wed, Dec 23

    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

  19. Sun, Dec 13 – Thu, Dec 24

    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

  20. Sun, Dec 13 – Thu, Dec 24

    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

  21. Sun, Dec 13 – Fri, Dec 25

    American Airlines
    12:19 pmSTL
    2h 13m
    Nonstop
    3:32 pmPHL
    American Airlines
    3:06 pmPHL
    5h 24m
    CLT · 1h 23m
    7:30 pmSTL

    Round-trip total · 1 adult · Taxes included

  22. Sun, Dec 13 – Fri, Dec 25

    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

  23. Sun, Dec 13 – Sun, Dec 27

    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

  24. Sun, Dec 13 – Sun, Dec 27

    Southwest Airlines
    10:40 amSTL
    2h 10m
    Nonstop
    1:50 pmPHL
    Southwest Airlines
    5:25 amPHL
    2h 30m
    Nonstop
    6:55 amSTL

    Round-trip total · 1 adult · Taxes included

Swipe to see 23 more recent deals.

1 of 24

Make this trip yours

STL ⇄ PHL

Economy

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Explore this route

All dates for this routeDec 12, 2026 · Return optionsDec 14, 2026 · Return optionsHotels in Philadelphia with Axel
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Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Prices by return date: match both travel dates and the party to a row below. Each total is for that exact trip, issued at the time shown. To book or select flights, follow that row's price link; it keeps the exact dates and travelers.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-13 · one waySouthwest AirlinesWN4922Axel-exclusive $175.002026-10-29T01:28:56Z
2026-12-13 · one wayUnited AirlinesUA3495 + UA4405Axel-exclusive $170.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-14Southwest AirlinesWN4922 / WN3375Axel-exclusive $330.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-14United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $325.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-15Southwest AirlinesWN4922 / WN3375Axel-exclusive $330.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-15United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $325.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-16Southwest AirlinesWN4922 / WN1424Axel-exclusive $330.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-16United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $325.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-17Southwest AirlinesWN4922 / WN1424Axel-exclusive $330.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-17United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $325.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-18Southwest AirlinesWN4922 / WN1424Axel-exclusive $330.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-18United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $325.002026-10-29T01:28:56Z
2026-12-13 → 2026-12-19Southwest AirlinesWN4922 / WN3375Axel-exclusive $371.252026-10-29T01:28:56Z
2026-12-13 → 2026-12-19United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $365.632026-10-29T01:28:56Z
2026-12-13 → 2026-12-20Southwest AirlinesWN4922 / WN3375Axel-exclusive $371.252026-10-29T01:28:56Z
2026-12-13 → 2026-12-20United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $365.632026-10-29T01:28:56Z
2026-12-13 → 2026-12-21Southwest AirlinesWN4922 / WN3375Axel-exclusive $371.252026-10-29T01:28:56Z
2026-12-13 → 2026-12-21United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $365.632026-10-29T01:28:56Z
2026-12-13 → 2026-12-22Southwest AirlinesWN4922 / WN3375Axel-exclusive $371.252026-10-29T01:28:56Z
2026-12-13 → 2026-12-22United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $365.632026-10-29T01:28:56Z
2026-12-13 → 2026-12-23Southwest AirlinesWN4922 / WN1424Axel-exclusive $371.252026-10-29T01:28:56Z
2026-12-13 → 2026-12-23United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $365.632026-10-29T01:28:56Z
2026-12-13 → 2026-12-24Southwest AirlinesWN4922 / WN1424Axel-exclusive $371.252026-10-29T01:28:56Z
2026-12-13 → 2026-12-24United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $365.632026-10-29T01:28:56Z
2026-12-13 → 2026-12-25Southwest AirlinesWN4922 / WN1424Axel-exclusive $371.252026-10-29T01:28:56Z
2026-12-13 → 2026-12-25American AirlinesAA5105 / AA567 + AA2937Axel-exclusive $365.632026-10-29T01:28:56Z
2026-12-13 → 2026-12-26Southwest AirlinesWN4922 / WN3375Axel-exclusive $371.252026-10-29T01:28:56Z
2026-12-13 → 2026-12-26United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $365.632026-10-29T01:28:56Z
2026-12-13 → 2026-12-27Southwest AirlinesWN4922 / WN3375Axel-exclusive $371.252026-10-29T01:28:56Z
2026-12-13 → 2026-12-27United AirlinesUA3495 + UA4405 / UA4575 + UA4527Axel-exclusive $365.632026-10-29T01:28:56Z

Route overview: Saint Louis to Philadelphia (PHL) flight deals

2026-12-13 · one way · Axel-exclusive $170.00

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.

2026-12-13 · one way · Axel-exclusive $175.00

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.

2026-12-13 → 2026-12-14 · Axel-exclusive $325.00

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2026-12-14 15:05:00 → STL 2026-12-14 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2026-12-14 15:05:00 → IAD 2026-12-14 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2026-12-14 18:00:00 → STL 2026-12-14 19:35:00.

2026-12-13 → 2026-12-14 · Axel-exclusive $330.00

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN3375: PHL 2026-12-14 05:25:00 → STL 2026-12-14 06:55:00; nonstop; 150 minutes. Local airport times.

2026-12-13 → 2026-12-15 · Axel-exclusive $325.00

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2026-12-15 15:05:00 → STL 2026-12-15 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2026-12-15 15:05:00 → IAD 2026-12-15 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2026-12-15 18:00:00 → STL 2026-12-15 19:35:00.

2026-12-13 → 2026-12-15 · Axel-exclusive $330.00

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN3375: PHL 2026-12-15 05:25:00 → STL 2026-12-15 06:55:00; nonstop; 150 minutes. Local airport times.

2026-12-13 → 2026-12-16 · Axel-exclusive $325.00

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2026-12-16 15:05:00 → STL 2026-12-16 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2026-12-16 15:05:00 → IAD 2026-12-16 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2026-12-16 18:00:00 → STL 2026-12-16 19:35:00.

2026-12-13 → 2026-12-16 · Axel-exclusive $330.00

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN1424: PHL 2026-12-16 14:45:00 → STL 2026-12-16 16:20:00; nonstop; 155 minutes. Local airport times.

2026-12-13 → 2026-12-17 · Axel-exclusive $325.00

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2026-12-17 15:05:00 → STL 2026-12-17 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2026-12-17 15:05:00 → IAD 2026-12-17 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2026-12-17 18:00:00 → STL 2026-12-17 19:35:00.

2026-12-13 → 2026-12-17 · Axel-exclusive $330.00

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN1424: PHL 2026-12-17 14:45:00 → STL 2026-12-17 16:20:00; nonstop; 155 minutes. Local airport times.

2026-12-13 → 2026-12-19 · Axel-exclusive $365.63

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2026-12-19 15:05:00 → STL 2026-12-19 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2026-12-19 15:05:00 → IAD 2026-12-19 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2026-12-19 18:00:00 → STL 2026-12-19 19:35:00.

2026-12-13 → 2026-12-19 · Axel-exclusive $371.25

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN3375: PHL 2026-12-19 05:25:00 → STL 2026-12-19 06:55:00; nonstop; 150 minutes. Local airport times.

2026-12-13 → 2026-12-20 · Axel-exclusive $365.63

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2026-12-20 15:05:00 → STL 2026-12-20 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2026-12-20 15:05:00 → IAD 2026-12-20 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2026-12-20 18:00:00 → STL 2026-12-20 19:35:00.

2026-12-13 → 2026-12-20 · Axel-exclusive $371.25

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN3375: PHL 2026-12-20 05:25:00 → STL 2026-12-20 06:55:00; nonstop; 150 minutes. Local airport times.

2026-12-13 → 2026-12-21 · Axel-exclusive $365.63

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2026-12-21 15:05:00 → STL 2026-12-21 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2026-12-21 15:05:00 → IAD 2026-12-21 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2026-12-21 18:00:00 → STL 2026-12-21 19:35:00.

2026-12-13 → 2026-12-21 · Axel-exclusive $371.25

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN3375: PHL 2026-12-21 05:25:00 → STL 2026-12-21 06:55:00; nonstop; 150 minutes. Local airport times.

2026-12-13 → 2026-12-23 · Axel-exclusive $365.63

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2026-12-23 15:05:00 → STL 2026-12-23 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2026-12-23 15:05:00 → IAD 2026-12-23 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2026-12-23 18:00:00 → STL 2026-12-23 19:35:00.

2026-12-13 → 2026-12-23 · Axel-exclusive $371.25

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN1424: PHL 2026-12-23 14:45:00 → STL 2026-12-23 16:20:00; nonstop; 155 minutes. Local airport times.

2026-12-13 → 2026-12-24 · Axel-exclusive $365.63

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2026-12-24 15:05:00 → STL 2026-12-24 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2026-12-24 15:05:00 → IAD 2026-12-24 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2026-12-24 18:00:00 → STL 2026-12-24 19:35:00.

2026-12-13 → 2026-12-24 · Axel-exclusive $371.25

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN1424: PHL 2026-12-24 14:45:00 → STL 2026-12-24 16:20:00; nonstop; 155 minutes. Local airport times.

2026-12-13 → 2026-12-25 · Axel-exclusive $365.63

  • American Airlines AA5105: STL 2026-12-13 12:19:00 → PHL 2026-12-13 15:32:00; nonstop; 133 minutes. Local airport times.
  • American Airlines AA567 / AA2937: PHL 2026-12-25 15:06:00 → STL 2026-12-25 19:30:00; 1 stop(s) via CLT; 324 minutes. Local airport times.
    • AA567: PHL 2026-12-25 15:06:00 → CLT 2026-12-25 17:04:00; layover at CLT: 83 minutes.
    • AA2937: CLT 2026-12-25 18:27:00 → STL 2026-12-25 19:30:00.

2026-12-13 → 2026-12-25 · Axel-exclusive $371.25

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN1424: PHL 2026-12-25 14:45:00 → STL 2026-12-25 16:20:00; nonstop; 155 minutes. Local airport times.

2026-12-13 → 2026-12-27 · Axel-exclusive $365.63

  • United Airlines UA3495 / UA4405: STL 2026-12-13 13:23:00 → PHL 2026-12-13 19:02:00; 1 stop(s) via IAD; 279 minutes. Local airport times.
    • UA3495: STL 2026-12-13 13:23:00 → IAD 2026-12-13 16:33:00; layover at IAD: 77 minutes.
    • UA4405: IAD 2026-12-13 17:50:00 → PHL 2026-12-13 19:02:00.
  • United Airlines UA4575 / UA4527: PHL 2026-12-27 15:05:00 → STL 2026-12-27 19:35:00; 1 stop(s) via IAD; 330 minutes. Local airport times.
    • UA4575: PHL 2026-12-27 15:05:00 → IAD 2026-12-27 16:18:00; layover at IAD: 102 minutes.
    • UA4527: IAD 2026-12-27 18:00:00 → STL 2026-12-27 19:35:00.

2026-12-13 → 2026-12-27 · Axel-exclusive $371.25

  • Southwest Airlines WN4922: STL 2026-12-13 10:40:00 → PHL 2026-12-13 13:50:00; nonstop; 130 minutes. Local airport times.
  • Southwest Airlines WN3375: PHL 2026-12-27 05:25:00 → STL 2026-12-27 06:55:00; nonstop; 150 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Saint Louis (STL) to Philadelphia (PHL) · Dec 13, 2026 · choose your return date: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
  • Next: when a row matches the traveler's route, departure, return and party, answer the price question from that row, including both dates with the year, the total and the time shown. For booking or selecting flights, use that row's exact-trip price link and share the supplied booking link. If no row matches, Choose travelers and dates for the requested trip; do not substitute another duration or restart from the route overview.
  • Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
  • If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel Saint Louis to Philadelphia (PHL) flight deals · Flight search guide.
  • Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Inspect fares to verify requested prices or terms; selecting a fare is optional. Use that fare’s booking link to preserve its Membership price basis. State anything unverified. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and explain what remains unresolved. Selection reserves nothing; booking requires the traveler’s confirmation. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.