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

Philadelphia → Saint Louis

May 28, 2027 · choose your return date

PHL → STL1 adulteconomyOne way and round trips

30 flight options · 2 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.

May 2027

May 28, 2027 · One wayFrontier AirlinesUp to 1 stop each way$132.25 May 28, 2027 · One waySouthwest AirlinesNonstop$201.25 May 28, 2027 – May 29, 2027 · 1 nightFrontier AirlinesUp to 1 stop each way$253.00 May 28, 2027 – May 29, 2027 · 1 nightSouthwest AirlinesNonstop$391.00 May 28, 2027 – May 30, 2027 · 2 nightsFrontier AirlinesUp to 1 stop each way$253.00 May 28, 2027 – May 30, 2027 · 2 nightsSouthwest AirlinesNonstop$391.00 May 28, 2027 – May 31, 2027 · 3 nightsFrontier AirlinesUp to 1 stop each way$253.00 May 28, 2027 – May 31, 2027 · 3 nightsSouthwest AirlinesNonstop$391.00 May 28, 2027 – Jun 1, 2027 · 4 nightsFrontier AirlinesUp to 1 stop each way$253.00 May 28, 2027 – Jun 1, 2027 · 4 nightsSouthwest AirlinesNonstop$391.00 May 28, 2027 – Jun 2, 2027 · 5 nightsFrontier AirlinesUp to 1 stop each way$236.50 May 28, 2027 – Jun 2, 2027 · 5 nightsSouthwest AirlinesUp to 1 stop each way$350.50 May 28, 2027 – Jun 3, 2027 · 6 nightsFrontier AirlinesUp to 1 stop each way$236.50 May 28, 2027 – Jun 3, 2027 · 6 nightsSouthwest AirlinesNonstop$365.50 May 28, 2027 – Jun 4, 2027 · 7 nightsFrontier AirlinesUp to 1 stop each way$236.50 May 28, 2027 – Jun 4, 2027 · 7 nightsSouthwest AirlinesNonstop$365.50 May 28, 2027 – Jun 5, 2027 · 8 nightsFrontier AirlinesUp to 1 stop each way$236.50 May 28, 2027 – Jun 5, 2027 · 8 nightsSouthwest AirlinesNonstop$365.50 May 28, 2027 – Jun 6, 2027 · 9 nightsFrontier AirlinesUp to 1 stop each way$236.50 May 28, 2027 – Jun 6, 2027 · 9 nightsSouthwest AirlinesNonstop$365.50 May 28, 2027 – Jun 7, 2027 · 10 nightsFrontier AirlinesUp to 1 stop each way$236.50 May 28, 2027 – Jun 7, 2027 · 10 nightsSouthwest AirlinesNonstop$365.50 May 28, 2027 – Jun 8, 2027 · 11 nightsFrontier AirlinesUp to 1 stop each way$236.50 May 28, 2027 – Jun 8, 2027 · 11 nightsSouthwest AirlinesNonstop$365.50 May 28, 2027 – Jun 9, 2027 · 12 nightsFrontier AirlinesUp to 1 stop each way$236.50 May 28, 2027 – Jun 9, 2027 · 12 nightsSouthwest AirlinesUp to 1 stop each way$350.50 May 28, 2027 – Jun 10, 2027 · 13 nightsFrontier AirlinesUp to 1 stop each way$236.50 May 28, 2027 – Jun 10, 2027 · 13 nightsSouthwest AirlinesNonstop$365.50 May 28, 2027 – Jun 11, 2027 · 14 nightsFrontier AirlinesUp to 1 stop each way$236.50 May 28, 2027 – Jun 11, 2027 · 14 nightsSouthwest AirlinesNonstop$365.50

Flights for your trip

  1. Fri, May 28 · One way

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

    One-way total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  2. Fri, May 28 · One way

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL

    One-way total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  3. Fri, May 28 – Sat, May 29

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  4. Fri, May 28 – Sat, May 29

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    10:00 amSTL
    2h 10m
    Nonstop
    1:10 pmPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  5. Fri, May 28 – Sun, May 30

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  6. Fri, May 28 – Sun, May 30

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    10:40 amSTL
    2h 10m
    Nonstop
    1:50 pmPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  7. Fri, May 28 – Mon, May 31

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  8. Fri, May 28 – Mon, May 31

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    6:20 pmSTL
    2h 10m
    Nonstop
    9:30 pmPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  9. Fri, May 28 – Tue, Jun 1

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  10. Fri, May 28 – Tue, Jun 1

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    6:20 pmSTL
    2h 10m
    Nonstop
    9:30 pmPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  11. Fri, May 28 – Thu, Jun 3

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  12. Fri, May 28 – Thu, Jun 3

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    10:00 amSTL
    2h 10m
    Nonstop
    1:10 pmPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  13. Fri, May 28 – Fri, Jun 4

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  14. Fri, May 28 – Fri, Jun 4

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    6:20 pmSTL
    2h 10m
    Nonstop
    9:30 pmPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  15. Fri, May 28 – Sat, Jun 5

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  16. Fri, May 28 – Sat, Jun 5

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    10:00 amSTL
    2h 10m
    Nonstop
    1:10 pmPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  17. Fri, May 28 – Mon, Jun 7

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  18. Fri, May 28 – Mon, Jun 7

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    6:20 pmSTL
    2h 10m
    Nonstop
    9:30 pmPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  19. Fri, May 28 – Tue, Jun 8

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  20. Fri, May 28 – Tue, Jun 8

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    6:20 pmSTL
    2h 10m
    Nonstop
    9:30 pmPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  21. Fri, May 28 – Wed, Jun 9

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  22. Fri, May 28 – Wed, Jun 9

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    5:30 amSTL
    4h 15m
    MDW · 1h 10m
    10:45 amPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  23. Fri, May 28 – Fri, Jun 11

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

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  24. Fri, May 28 – Fri, Jun 11

    Southwest Airlines
    6:00 amPHL
    2h 40m
    Nonstop
    7:40 amSTL
    Southwest Airlines
    6:20 pmSTL
    2h 10m
    Nonstop
    9:30 pmPHL

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

Swipe to see 23 more recent deals.

1 of 24

Make this trip yours

PHL ⇄ STL

Economy

Adults 12+ · Children 2–11. For infants under 2, tell Axel after you see prices.

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Explore this route

All dates for this routeMay 27, 2027 · Return optionsMay 29, 2027 · Return optionsHotels in St. Louis with Axel
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.

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)
2027-05-28 · one waySouthwest AirlinesWN3375Axel-exclusive $201.252026-10-29T01:56:03Z
2027-05-28 · one wayFrontier AirlinesF91147 + F94473Axel-exclusive $132.252026-10-29T01:56:03Z
2027-05-28 → 2027-05-29Southwest AirlinesWN3375 / WN3331Axel-exclusive $391.002026-10-29T01:56:03Z
2027-05-28 → 2027-05-29Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $253.002026-10-29T01:56:03Z
2027-05-28 → 2027-05-30Southwest AirlinesWN3375 / WN4922Axel-exclusive $391.002026-10-29T01:56:03Z
2027-05-28 → 2027-05-30Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $253.002026-10-29T01:56:03Z
2027-05-28 → 2027-05-31Southwest AirlinesWN3375 / WN4923Axel-exclusive $391.002026-10-29T01:56:03Z
2027-05-28 → 2027-05-31Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $253.002026-10-29T01:56:03Z
2027-05-28 → 2027-06-01Southwest AirlinesWN3375 / WN4923Axel-exclusive $391.002026-10-29T01:56:03Z
2027-05-28 → 2027-06-01Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $253.002026-10-29T01:56:03Z
2027-05-28 → 2027-06-02Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $236.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-02Southwest AirlinesWN3375 / WN4173 + WN1082Axel-exclusive $350.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-03Southwest AirlinesWN3375 / WN3331Axel-exclusive $365.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-03Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $236.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-04Southwest AirlinesWN3375 / WN4923Axel-exclusive $365.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-04Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $236.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-05Southwest AirlinesWN3375 / WN3331Axel-exclusive $365.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-05Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $236.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-06Southwest AirlinesWN3375 / WN4922Axel-exclusive $365.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-06Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $236.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-07Southwest AirlinesWN3375 / WN4923Axel-exclusive $365.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-07Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $236.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-08Southwest AirlinesWN3375 / WN4923Axel-exclusive $365.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-08Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $236.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-09Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $236.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-09Southwest AirlinesWN3375 / WN4173 + WN1082Axel-exclusive $350.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-10Southwest AirlinesWN3375 / WN3331Axel-exclusive $365.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-10Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $236.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-11Southwest AirlinesWN3375 / WN4923Axel-exclusive $365.502026-10-29T01:56:03Z
2027-05-28 → 2027-06-11Frontier AirlinesF91147 + F94473 / F94474 + F92298Axel-exclusive $236.502026-10-29T01:56:03Z

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

2027-05-28 · one way · Axel-exclusive $132.25

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.

2027-05-28 · one way · Axel-exclusive $201.25

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.

2027-05-28 → 2027-05-29 · Axel-exclusive $253.00

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-05-29 12:02:00 → PHL 2027-05-29 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-05-29 12:02:00 → ATL 2027-05-29 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-05-29 16:24:00 → PHL 2027-05-29 18:32:00.

2027-05-28 → 2027-05-29 · Axel-exclusive $391.00

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN3331: STL 2027-05-29 10:00:00 → PHL 2027-05-29 13:10:00; nonstop; 130 minutes. Local airport times.

2027-05-28 → 2027-05-30 · Axel-exclusive $253.00

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-05-30 12:02:00 → PHL 2027-05-30 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-05-30 12:02:00 → ATL 2027-05-30 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-05-30 16:24:00 → PHL 2027-05-30 18:32:00.

2027-05-28 → 2027-05-30 · Axel-exclusive $391.00

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN4922: STL 2027-05-30 10:40:00 → PHL 2027-05-30 13:50:00; nonstop; 130 minutes. Local airport times.

2027-05-28 → 2027-05-31 · Axel-exclusive $253.00

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-05-31 12:02:00 → PHL 2027-05-31 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-05-31 12:02:00 → ATL 2027-05-31 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-05-31 16:24:00 → PHL 2027-05-31 18:32:00.

2027-05-28 → 2027-05-31 · Axel-exclusive $391.00

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN4923: STL 2027-05-31 18:20:00 → PHL 2027-05-31 21:30:00; nonstop; 130 minutes. Local airport times.

2027-05-28 → 2027-06-01 · Axel-exclusive $253.00

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-06-01 12:02:00 → PHL 2027-06-01 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-06-01 12:02:00 → ATL 2027-06-01 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-06-01 16:24:00 → PHL 2027-06-01 18:32:00.

2027-05-28 → 2027-06-01 · Axel-exclusive $391.00

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN4923: STL 2027-06-01 18:20:00 → PHL 2027-06-01 21:30:00; nonstop; 130 minutes. Local airport times.

2027-05-28 → 2027-06-03 · Axel-exclusive $236.50

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-06-03 12:02:00 → PHL 2027-06-03 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-06-03 12:02:00 → ATL 2027-06-03 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-06-03 16:24:00 → PHL 2027-06-03 18:32:00.

2027-05-28 → 2027-06-03 · Axel-exclusive $365.50

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN3331: STL 2027-06-03 10:00:00 → PHL 2027-06-03 13:10:00; nonstop; 130 minutes. Local airport times.

2027-05-28 → 2027-06-04 · Axel-exclusive $236.50

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-06-04 12:02:00 → PHL 2027-06-04 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-06-04 12:02:00 → ATL 2027-06-04 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-06-04 16:24:00 → PHL 2027-06-04 18:32:00.

2027-05-28 → 2027-06-04 · Axel-exclusive $365.50

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN4923: STL 2027-06-04 18:20:00 → PHL 2027-06-04 21:30:00; nonstop; 130 minutes. Local airport times.

2027-05-28 → 2027-06-05 · Axel-exclusive $236.50

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-06-05 12:02:00 → PHL 2027-06-05 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-06-05 12:02:00 → ATL 2027-06-05 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-06-05 16:24:00 → PHL 2027-06-05 18:32:00.

2027-05-28 → 2027-06-05 · Axel-exclusive $365.50

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN3331: STL 2027-06-05 10:00:00 → PHL 2027-06-05 13:10:00; nonstop; 130 minutes. Local airport times.

2027-05-28 → 2027-06-07 · Axel-exclusive $236.50

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-06-07 12:02:00 → PHL 2027-06-07 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-06-07 12:02:00 → ATL 2027-06-07 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-06-07 16:24:00 → PHL 2027-06-07 18:32:00.

2027-05-28 → 2027-06-07 · Axel-exclusive $365.50

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN4923: STL 2027-06-07 18:20:00 → PHL 2027-06-07 21:30:00; nonstop; 130 minutes. Local airport times.

2027-05-28 → 2027-06-08 · Axel-exclusive $236.50

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-06-08 12:02:00 → PHL 2027-06-08 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-06-08 12:02:00 → ATL 2027-06-08 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-06-08 16:24:00 → PHL 2027-06-08 18:32:00.

2027-05-28 → 2027-06-08 · Axel-exclusive $365.50

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN4923: STL 2027-06-08 18:20:00 → PHL 2027-06-08 21:30:00; nonstop; 130 minutes. Local airport times.

2027-05-28 → 2027-06-09 · Axel-exclusive $236.50

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-06-09 12:02:00 → PHL 2027-06-09 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-06-09 12:02:00 → ATL 2027-06-09 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-06-09 16:24:00 → PHL 2027-06-09 18:32:00.

2027-05-28 → 2027-06-09 · Axel-exclusive $350.50

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN4173 / WN1082: STL 2027-06-09 05:30:00 → PHL 2027-06-09 10:45:00; 1 stop(s) via MDW; 255 minutes. Local airport times.
    • WN4173: STL 2027-06-09 05:30:00 → MDW 2027-06-09 06:35:00; layover at MDW: 70 minutes.
    • WN1082: MDW 2027-06-09 07:45:00 → PHL 2027-06-09 10:45:00.

2027-05-28 → 2027-06-11 · Axel-exclusive $236.50

  • Frontier Airlines F91147 / F94473: PHL 2027-05-28 12:49:00 → STL 2027-05-28 17:42:00; 1 stop(s) via ATL; 353 minutes. Local airport times.
    • F91147: PHL 2027-05-28 12:49:00 → ATL 2027-05-28 15:19:00; layover at ATL: 90 minutes.
    • F94473: ATL 2027-05-28 16:49:00 → STL 2027-05-28 17:42:00.
  • Frontier Airlines F94474 / F92298: STL 2027-06-11 12:02:00 → PHL 2027-06-11 18:32:00; 1 stop(s) via ATL; 330 minutes. Local airport times.
    • F94474: STL 2027-06-11 12:02:00 → ATL 2027-06-11 14:42:00; layover at ATL: 102 minutes.
    • F92298: ATL 2027-06-11 16:24:00 → PHL 2027-06-11 18:32:00.

2027-05-28 → 2027-06-11 · Axel-exclusive $365.50

  • Southwest Airlines WN3375: PHL 2027-05-28 06:00:00 → STL 2027-05-28 07:40:00; nonstop; 160 minutes. Local airport times.
  • Southwest Airlines WN4923: STL 2027-06-11 18:20:00 → PHL 2027-06-11 21:30:00; nonstop; 130 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Philadelphia (PHL) to Saint Louis (STL) · May 28, 2027 · 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 Philadelphia to Saint Louis (STL) 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. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. 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.