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Route overview: Saint Louis to Boston (BOS) flight deals

Saint Louis → Boston

Feb 4, 2027 · choose your return date

STL → BOS1 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.

February 2027

Feb 4, 2027 · One wayUnited AirlinesUp to 1 stop each way$155.00 Feb 4, 2027 · One waySouthwest AirlinesNonstop$160.00 Feb 4, 2027 – Feb 5, 2027 · 1 nightUnited AirlinesUp to 1 stop each way$290.00 Feb 4, 2027 – Feb 5, 2027 · 1 nightSouthwest AirlinesNonstop$300.00 Feb 4, 2027 – Feb 6, 2027 · 2 nightsUnited AirlinesUp to 1 stop each way$290.00 Feb 4, 2027 – Feb 6, 2027 · 2 nightsSouthwest AirlinesNonstop$300.00 Feb 4, 2027 – Feb 7, 2027 · 3 nightsUnited AirlinesUp to 1 stop each way$290.00 Feb 4, 2027 – Feb 7, 2027 · 3 nightsSouthwest AirlinesNonstop$300.00 Feb 4, 2027 – Feb 8, 2027 · 4 nightsUnited AirlinesUp to 1 stop each way$290.00 Feb 4, 2027 – Feb 8, 2027 · 4 nightsSouthwest AirlinesNonstop$300.00 Feb 4, 2027 – Feb 9, 2027 · 5 nightsUnited AirlinesUp to 1 stop each way$290.00 Feb 4, 2027 – Feb 9, 2027 · 5 nightsSouthwest AirlinesNonstop$300.00 Feb 4, 2027 – Feb 10, 2027 · 6 nightsUnited AirlinesUp to 1 stop each way$290.00 Feb 4, 2027 – Feb 10, 2027 · 6 nightsSouthwest AirlinesNonstop$300.00 Feb 4, 2027 – Feb 11, 2027 · 7 nightsUnited AirlinesUp to 1 stop each way$290.00 Feb 4, 2027 – Feb 11, 2027 · 7 nightsSouthwest AirlinesNonstop$300.00 Feb 4, 2027 – Feb 12, 2027 · 8 nightsUnited AirlinesUp to 1 stop each way$311.75 Feb 4, 2027 – Feb 12, 2027 · 8 nightsSouthwest AirlinesNonstop$322.50 Feb 4, 2027 – Feb 13, 2027 · 9 nightsUnited AirlinesUp to 1 stop each way$311.75 Feb 4, 2027 – Feb 13, 2027 · 9 nightsSouthwest AirlinesNonstop$322.50 Feb 4, 2027 – Feb 14, 2027 · 10 nightsUnited AirlinesUp to 1 stop each way$311.75 Feb 4, 2027 – Feb 14, 2027 · 10 nightsSouthwest AirlinesNonstop$322.50 Feb 4, 2027 – Feb 15, 2027 · 11 nightsUnited AirlinesUp to 1 stop each way$311.75 Feb 4, 2027 – Feb 15, 2027 · 11 nightsSouthwest AirlinesNonstop$322.50 Feb 4, 2027 – Feb 16, 2027 · 12 nightsUnited AirlinesUp to 1 stop each way$311.75 Feb 4, 2027 – Feb 16, 2027 · 12 nightsSouthwest AirlinesNonstop$322.50 Feb 4, 2027 – Feb 17, 2027 · 13 nightsUnited AirlinesUp to 1 stop each way$290.00 Feb 4, 2027 – Feb 17, 2027 · 13 nightsSouthwest AirlinesNonstop$300.00 Feb 4, 2027 – Feb 18, 2027 · 14 nightsUnited AirlinesUp to 1 stop each way$290.00 Feb 4, 2027 – Feb 18, 2027 · 14 nightsSouthwest AirlinesNonstop$300.00

Flights for your trip

  1. Thu, Feb 4 · One way

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS

    One-way total · 1 adult · Taxes included

  2. Thu, Feb 4 · One way

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS

    One-way total · 1 adult · Taxes included

  3. Thu, Feb 4 – Fri, Feb 5

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  4. Thu, Feb 4 – Fri, Feb 5

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:05 pmBOS
    3h 10m
    Nonstop
    7:15 pmSTL

    Round-trip total · 1 adult · Taxes included

  5. Thu, Feb 4 – Sat, Feb 6

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  6. Thu, Feb 4 – Sat, Feb 6

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:10 amBOS
    3h 5m
    Nonstop
    7:15 amSTL

    Round-trip total · 1 adult · Taxes included

  7. Thu, Feb 4 – Sun, Feb 7

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  8. Thu, Feb 4 – Sun, Feb 7

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:10 amBOS
    3h 5m
    Nonstop
    7:15 amSTL

    Round-trip total · 1 adult · Taxes included

  9. Thu, Feb 4 – Mon, Feb 8

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  10. Thu, Feb 4 – Mon, Feb 8

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:05 pmBOS
    3h 10m
    Nonstop
    7:15 pmSTL

    Round-trip total · 1 adult · Taxes included

  11. Thu, Feb 4 – Wed, Feb 10

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  12. Thu, Feb 4 – Wed, Feb 10

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:35 amBOS
    3h 5m
    Nonstop
    7:40 amSTL

    Round-trip total · 1 adult · Taxes included

  13. Thu, Feb 4 – Thu, Feb 11

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  14. Thu, Feb 4 – Thu, Feb 11

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:20 amBOS
    3h 10m
    Nonstop
    7:30 amSTL

    Round-trip total · 1 adult · Taxes included

  15. Thu, Feb 4 – Fri, Feb 12

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  16. Thu, Feb 4 – Fri, Feb 12

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:05 pmBOS
    3h 10m
    Nonstop
    7:15 pmSTL

    Round-trip total · 1 adult · Taxes included

  17. Thu, Feb 4 – Sun, Feb 14

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  18. Thu, Feb 4 – Sun, Feb 14

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:10 amBOS
    3h 5m
    Nonstop
    7:15 amSTL

    Round-trip total · 1 adult · Taxes included

  19. Thu, Feb 4 – Mon, Feb 15

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  20. Thu, Feb 4 – Mon, Feb 15

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:05 pmBOS
    3h 10m
    Nonstop
    7:15 pmSTL

    Round-trip total · 1 adult · Taxes included

  21. Thu, Feb 4 – Tue, Feb 16

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  22. Thu, Feb 4 – Tue, Feb 16

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:05 pmBOS
    3h 10m
    Nonstop
    7:15 pmSTL

    Round-trip total · 1 adult · Taxes included

  23. Thu, Feb 4 – Thu, Feb 18

    United Airlines
    8:30 amSTL
    5h 2m
    IAD · 1h 15m
    2:32 pmBOS
    United Airlines
    5:45 amBOS
    5h 27m
    IAD · 1h 15m
    10:12 amSTL

    Round-trip total · 1 adult · Taxes included

  24. Thu, Feb 4 – Thu, Feb 18

    Southwest Airlines
    10:15 amSTL
    2h 30m
    Nonstop
    1:45 pmBOS
    Southwest Airlines
    5:20 amBOS
    3h 10m
    Nonstop
    7:30 amSTL

    Round-trip total · 1 adult · Taxes included

Swipe to see 23 more recent deals.

1 of 24

Make this trip yours

STL ⇄ BOS

Economy

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Explore this route

All dates for this routeFeb 3, 2027 · Return optionsFeb 5, 2027 · Return optionsHotels in Boston 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)
2027-02-04 · one waySouthwest AirlinesWN4918Axel-exclusive $160.002026-10-29T01:28:17Z
2027-02-04 · one wayUnited AirlinesUA4406 + UA1392Axel-exclusive $155.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-05Southwest AirlinesWN4918 / WN4929Axel-exclusive $300.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-05United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $290.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-06Southwest AirlinesWN4918 / WN819Axel-exclusive $300.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-06United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $290.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-07Southwest AirlinesWN4918 / WN819Axel-exclusive $300.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-07United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $290.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-08Southwest AirlinesWN4918 / WN4929Axel-exclusive $300.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-08United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $290.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-09Southwest AirlinesWN4918 / WN4929Axel-exclusive $300.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-09United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $290.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-10Southwest AirlinesWN4918 / WN819Axel-exclusive $300.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-10United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $290.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-11Southwest AirlinesWN4918 / WN819Axel-exclusive $300.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-11United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $290.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-12Southwest AirlinesWN4918 / WN4929Axel-exclusive $322.502026-10-29T01:28:17Z
2027-02-04 → 2027-02-12United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $311.752026-10-29T01:28:17Z
2027-02-04 → 2027-02-13Southwest AirlinesWN4918 / WN819Axel-exclusive $322.502026-10-29T01:28:17Z
2027-02-04 → 2027-02-13United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $311.752026-10-29T01:28:17Z
2027-02-04 → 2027-02-14Southwest AirlinesWN4918 / WN819Axel-exclusive $322.502026-10-29T01:28:17Z
2027-02-04 → 2027-02-14United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $311.752026-10-29T01:28:17Z
2027-02-04 → 2027-02-15Southwest AirlinesWN4918 / WN4929Axel-exclusive $322.502026-10-29T01:28:17Z
2027-02-04 → 2027-02-15United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $311.752026-10-29T01:28:17Z
2027-02-04 → 2027-02-16Southwest AirlinesWN4918 / WN4929Axel-exclusive $322.502026-10-29T01:28:17Z
2027-02-04 → 2027-02-16United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $311.752026-10-29T01:28:17Z
2027-02-04 → 2027-02-17Southwest AirlinesWN4918 / WN819Axel-exclusive $300.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-17United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $290.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-18Southwest AirlinesWN4918 / WN819Axel-exclusive $300.002026-10-29T01:28:17Z
2027-02-04 → 2027-02-18United AirlinesUA4406 + UA1392 / UA1734 + UA4427Axel-exclusive $290.002026-10-29T01:28:17Z

Route overview: Saint Louis to Boston (BOS) flight deals

2027-02-04 · one way · Axel-exclusive $155.00

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.

2027-02-04 · one way · Axel-exclusive $160.00

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.

2027-02-04 → 2027-02-05 · Axel-exclusive $290.00

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-05 05:45:00 → STL 2027-02-05 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-05 05:45:00 → IAD 2027-02-05 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-05 08:40:00 → STL 2027-02-05 10:12:00.

2027-02-04 → 2027-02-05 · Axel-exclusive $300.00

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN4929: BOS 2027-02-05 17:05:00 → STL 2027-02-05 19:15:00; nonstop; 190 minutes. Local airport times.

2027-02-04 → 2027-02-06 · Axel-exclusive $290.00

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-06 05:45:00 → STL 2027-02-06 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-06 05:45:00 → IAD 2027-02-06 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-06 08:40:00 → STL 2027-02-06 10:12:00.

2027-02-04 → 2027-02-06 · Axel-exclusive $300.00

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN819: BOS 2027-02-06 05:10:00 → STL 2027-02-06 07:15:00; nonstop; 185 minutes. Local airport times.

2027-02-04 → 2027-02-07 · Axel-exclusive $290.00

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-07 05:45:00 → STL 2027-02-07 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-07 05:45:00 → IAD 2027-02-07 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-07 08:40:00 → STL 2027-02-07 10:12:00.

2027-02-04 → 2027-02-07 · Axel-exclusive $300.00

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN819: BOS 2027-02-07 05:10:00 → STL 2027-02-07 07:15:00; nonstop; 185 minutes. Local airport times.

2027-02-04 → 2027-02-08 · Axel-exclusive $290.00

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-08 05:45:00 → STL 2027-02-08 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-08 05:45:00 → IAD 2027-02-08 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-08 08:40:00 → STL 2027-02-08 10:12:00.

2027-02-04 → 2027-02-08 · Axel-exclusive $300.00

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN4929: BOS 2027-02-08 17:05:00 → STL 2027-02-08 19:15:00; nonstop; 190 minutes. Local airport times.

2027-02-04 → 2027-02-10 · Axel-exclusive $290.00

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-10 05:45:00 → STL 2027-02-10 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-10 05:45:00 → IAD 2027-02-10 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-10 08:40:00 → STL 2027-02-10 10:12:00.

2027-02-04 → 2027-02-10 · Axel-exclusive $300.00

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN819: BOS 2027-02-10 05:35:00 → STL 2027-02-10 07:40:00; nonstop; 185 minutes. Local airport times.

2027-02-04 → 2027-02-11 · Axel-exclusive $290.00

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-11 05:45:00 → STL 2027-02-11 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-11 05:45:00 → IAD 2027-02-11 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-11 08:40:00 → STL 2027-02-11 10:12:00.

2027-02-04 → 2027-02-11 · Axel-exclusive $300.00

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN819: BOS 2027-02-11 05:20:00 → STL 2027-02-11 07:30:00; nonstop; 190 minutes. Local airport times.

2027-02-04 → 2027-02-12 · Axel-exclusive $311.75

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-12 05:45:00 → STL 2027-02-12 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-12 05:45:00 → IAD 2027-02-12 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-12 08:40:00 → STL 2027-02-12 10:12:00.

2027-02-04 → 2027-02-12 · Axel-exclusive $322.50

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN4929: BOS 2027-02-12 17:05:00 → STL 2027-02-12 19:15:00; nonstop; 190 minutes. Local airport times.

2027-02-04 → 2027-02-14 · Axel-exclusive $311.75

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-14 05:45:00 → STL 2027-02-14 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-14 05:45:00 → IAD 2027-02-14 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-14 08:40:00 → STL 2027-02-14 10:12:00.

2027-02-04 → 2027-02-14 · Axel-exclusive $322.50

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN819: BOS 2027-02-14 05:10:00 → STL 2027-02-14 07:15:00; nonstop; 185 minutes. Local airport times.

2027-02-04 → 2027-02-15 · Axel-exclusive $311.75

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-15 05:45:00 → STL 2027-02-15 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-15 05:45:00 → IAD 2027-02-15 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-15 08:40:00 → STL 2027-02-15 10:12:00.

2027-02-04 → 2027-02-15 · Axel-exclusive $322.50

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN4929: BOS 2027-02-15 17:05:00 → STL 2027-02-15 19:15:00; nonstop; 190 minutes. Local airport times.

2027-02-04 → 2027-02-16 · Axel-exclusive $311.75

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-16 05:45:00 → STL 2027-02-16 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-16 05:45:00 → IAD 2027-02-16 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-16 08:40:00 → STL 2027-02-16 10:12:00.

2027-02-04 → 2027-02-16 · Axel-exclusive $322.50

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN4929: BOS 2027-02-16 17:05:00 → STL 2027-02-16 19:15:00; nonstop; 190 minutes. Local airport times.

2027-02-04 → 2027-02-18 · Axel-exclusive $290.00

  • United Airlines UA4406 / UA1392: STL 2027-02-04 08:30:00 → BOS 2027-02-04 14:32:00; 1 stop(s) via IAD; 302 minutes. Local airport times.
    • UA4406: STL 2027-02-04 08:30:00 → IAD 2027-02-04 11:35:00; layover at IAD: 75 minutes.
    • UA1392: IAD 2027-02-04 12:50:00 → BOS 2027-02-04 14:32:00.
  • United Airlines UA1734 / UA4427: BOS 2027-02-18 05:45:00 → STL 2027-02-18 10:12:00; 1 stop(s) via IAD; 327 minutes. Local airport times.
    • UA1734: BOS 2027-02-18 05:45:00 → IAD 2027-02-18 07:25:00; layover at IAD: 75 minutes.
    • UA4427: IAD 2027-02-18 08:40:00 → STL 2027-02-18 10:12:00.

2027-02-04 → 2027-02-18 · Axel-exclusive $300.00

  • Southwest Airlines WN4918: STL 2027-02-04 10:15:00 → BOS 2027-02-04 13:45:00; nonstop; 150 minutes. Local airport times.
  • Southwest Airlines WN819: BOS 2027-02-18 05:20:00 → STL 2027-02-18 07:30:00; nonstop; 190 minutes. Local airport times.

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For AI assistants

  • This page: Saint Louis (STL) to Boston (BOS) · Feb 4, 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 Saint Louis to Boston (BOS) 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.