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Route overview: Boston to Seattle (SEA) flight deals

Boston → Seattle

Dec 10, 2026 · choose your return date

BOS → SEA1 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 10, 2026 · One waySun Country AirlinesUp to 1 stop each way$155.00 Dec 10, 2026 · One wayAlaska AirlinesNonstop$215.00 Dec 10, 2026 – Dec 11, 2026 · 1 nightSun Country Airlines / Delta Air LinesUp to 1 stop each way$360.00 Dec 10, 2026 – Dec 11, 2026 · 1 nightAlaska AirlinesNonstop$410.00 Dec 10, 2026 – Dec 12, 2026 · 2 nightsSun Country Airlines / Delta Air LinesUp to 1 stop each way$360.00 Dec 10, 2026 – Dec 12, 2026 · 2 nightsAlaska AirlinesNonstop$410.00 Dec 10, 2026 – Dec 13, 2026 · 3 nightsSun Country Airlines / Alaska AirlinesUp to 1 stop each way$352.50 Dec 10, 2026 – Dec 13, 2026 · 3 nightsAlaska AirlinesNonstop$410.00 Dec 10, 2026 – Dec 14, 2026 · 4 nightsSun Country Airlines / Alaska AirlinesUp to 1 stop each way$352.50 Dec 10, 2026 – Dec 14, 2026 · 4 nightsAlaska AirlinesNonstop$410.00 Dec 10, 2026 – Dec 15, 2026 · 5 nightsSun Country Airlines / Alaska AirlinesUp to 1 stop each way$352.50 Dec 10, 2026 – Dec 15, 2026 · 5 nightsAlaska AirlinesNonstop$410.00 Dec 10, 2026 – Dec 16, 2026 · 6 nightsSun Country Airlines / Alaska AirlinesUp to 1 stop each way$352.50 Dec 10, 2026 – Dec 16, 2026 · 6 nightsAlaska AirlinesNonstop$410.00 Dec 10, 2026 – Dec 17, 2026 · 7 nightsSun Country Airlines / Alaska AirlinesUp to 1 stop each way$352.50 Dec 10, 2026 – Dec 17, 2026 · 7 nightsAlaska AirlinesNonstop$410.00 Dec 10, 2026 – Dec 18, 2026 · 8 nightsSun Country Airlines / Delta Air LinesUp to 1 stop each way$360.00 Dec 10, 2026 – Dec 18, 2026 · 8 nightsAlaska AirlinesNonstop$410.00 Dec 10, 2026 – Dec 19, 2026 · 9 nightsSun Country Airlines / Delta Air LinesUp to 1 stop each way$445.00 Dec 10, 2026 – Dec 19, 2026 · 9 nightsAlaska AirlinesNonstop$492.00 Dec 10, 2026 – Dec 20, 2026 · 10 nightsSun Country Airlines / Delta Air LinesUp to 1 stop each way$445.00 Dec 10, 2026 – Dec 20, 2026 · 10 nightsAlaska AirlinesNonstop$492.00 Dec 10, 2026 – Dec 21, 2026 · 11 nightsSun Country Airlines / Alaska AirlinesUp to 1 stop each way$434.50 Dec 10, 2026 – Dec 21, 2026 · 11 nightsAlaska AirlinesNonstop$492.00 Dec 10, 2026 – Dec 22, 2026 · 12 nightsSun Country Airlines / Alaska AirlinesUp to 1 stop each way$434.50 Dec 10, 2026 – Dec 22, 2026 · 12 nightsAlaska AirlinesNonstop$492.00 Dec 10, 2026 – Dec 23, 2026 · 13 nightsSun Country Airlines / Alaska AirlinesUp to 1 stop each way$434.50 Dec 10, 2026 – Dec 23, 2026 · 13 nightsAlaska AirlinesNonstop$492.00 Dec 10, 2026 – Dec 24, 2026 · 14 nightsSun Country Airlines / Alaska AirlinesUp to 1 stop each way$434.50 Dec 10, 2026 – Dec 24, 2026 · 14 nightsAlaska AirlinesNonstop$492.00

Flights for your trip

  1. Thu, Dec 10 · One way

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA

    One-way total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  2. Thu, Dec 10 · One way

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA

    One-way total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  3. Thu, Dec 10 – Fri, Dec 11

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Delta Air Lines
    10:52 pmSEA
    5h 27m
    Nonstop
    7:19 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  4. Thu, Dec 10 – Fri, Dec 11

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    3:40 pmSEA
    5h 19m
    Nonstop
    11:59 pmBOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  5. Thu, Dec 10 – Sat, Dec 12

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Delta Air Lines
    11:15 pmSEA
    5h 21m
    Nonstop
    7:36 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  6. Thu, Dec 10 – Sat, Dec 12

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    11:22 pmSEA
    5h 18m
    Nonstop
    7:40 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  7. Thu, Dec 10 – Sun, Dec 13

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Alaska Airlines
    9:21 pmSEA
    5h 19m
    Nonstop
    5:40 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  8. Thu, Dec 10 – Sun, Dec 13

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    9:21 pmSEA
    5h 19m
    Nonstop
    5:40 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  9. Thu, Dec 10 – Mon, Dec 14

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Alaska Airlines
    9:21 pmSEA
    5h 19m
    Nonstop
    5:40 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  10. Thu, Dec 10 – Mon, Dec 14

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    9:21 pmSEA
    5h 19m
    Nonstop
    5:40 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  11. Thu, Dec 10 – Wed, Dec 16

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Alaska Airlines
    9:00 amSEA
    5h 19m
    Nonstop
    5:19 pmBOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  12. Thu, Dec 10 – Wed, Dec 16

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    9:00 amSEA
    5h 19m
    Nonstop
    5:19 pmBOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  13. Thu, Dec 10 – Thu, Dec 17

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Alaska Airlines
    3:40 pmSEA
    5h 19m
    Nonstop
    11:59 pmBOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  14. Thu, Dec 10 – Thu, Dec 17

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    3:40 pmSEA
    5h 19m
    Nonstop
    11:59 pmBOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  15. Thu, Dec 10 – Fri, Dec 18

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Delta Air Lines
    10:52 pmSEA
    5h 27m
    Nonstop
    7:19 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  16. Thu, Dec 10 – Fri, Dec 18

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    3:40 pmSEA
    5h 19m
    Nonstop
    11:59 pmBOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  17. Thu, Dec 10 – Sun, Dec 20

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Delta Air Lines
    3:55 pmSEA
    5h 18m
    Nonstop
    12:13 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  18. Thu, Dec 10 – Sun, Dec 20

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    9:21 pmSEA
    5h 19m
    Nonstop
    5:40 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  19. Thu, Dec 10 – Mon, Dec 21

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Alaska Airlines
    9:21 pmSEA
    5h 19m
    Nonstop
    5:40 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  20. Thu, Dec 10 – Mon, Dec 21

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    9:21 pmSEA
    5h 19m
    Nonstop
    5:40 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  21. Thu, Dec 10 – Tue, Dec 22

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Alaska Airlines
    9:21 pmSEA
    5h 19m
    Nonstop
    5:40 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  22. Thu, Dec 10 – Tue, Dec 22

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    9:21 pmSEA
    5h 19m
    Nonstop
    5:40 am+1BOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  23. Thu, Dec 10 – Thu, Dec 24

    Sun Country Airlines
    11:43 amBOS
    8h 34m
    MSP · 1h 24m
    5:17 pmSEA
    Alaska Airlines
    3:35 pmSEA
    5h 24m
    Nonstop
    11:59 pmBOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

  24. Thu, Dec 10 – Thu, Dec 24

    Alaska Airlines
    9:00 amBOS
    6h 37m
    Nonstop
    12:37 pmSEA
    Alaska Airlines
    3:35 pmSEA
    5h 24m
    Nonstop
    11:59 pmBOS

    Round-trip total · 1 adult · Taxes included

    Availability is checked when you select these flights.

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1 of 24

Make this trip yours

BOS ⇄ SEA

Economy

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Explore this route

All dates for this routeDec 9, 2026 · Return optionsDec 11, 2026 · Return optionsHotels in Seattle 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)
2026-12-10 · one wayAlaska AirlinesAS215Axel-exclusive $215.002026-10-29T00:52:47Z
2026-12-10 · one waySun Country AirlinesSY252 + SY285Axel-exclusive $155.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-11Alaska AirlinesAS215 / AS460Axel-exclusive $410.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-11Sun Country Airlines / Delta Air LinesSY252 + SY285 / DL473Axel-exclusive $360.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-12Alaska AirlinesAS215 / AS214Axel-exclusive $410.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-12Sun Country Airlines / Delta Air LinesSY252 + SY285 / DL473Axel-exclusive $360.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-13Alaska AirlinesAS215 / AS214Axel-exclusive $410.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-13Sun Country Airlines / Alaska AirlinesSY252 + SY285 / AS214Axel-exclusive $352.502026-10-29T00:52:47Z
2026-12-10 → 2026-12-14Alaska AirlinesAS215 / AS214Axel-exclusive $410.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-14Sun Country Airlines / Alaska AirlinesSY252 + SY285 / AS214Axel-exclusive $352.502026-10-29T00:52:47Z
2026-12-10 → 2026-12-15Alaska AirlinesAS215 / AS214Axel-exclusive $410.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-15Sun Country Airlines / Alaska AirlinesSY252 + SY285 / AS214Axel-exclusive $352.502026-10-29T00:52:47Z
2026-12-10 → 2026-12-16Alaska AirlinesAS215 / AS279Axel-exclusive $410.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-16Sun Country Airlines / Alaska AirlinesSY252 + SY285 / AS279Axel-exclusive $352.502026-10-29T00:52:47Z
2026-12-10 → 2026-12-17Alaska AirlinesAS215 / AS460Axel-exclusive $410.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-17Sun Country Airlines / Alaska AirlinesSY252 + SY285 / AS460Axel-exclusive $352.502026-10-29T00:52:47Z
2026-12-10 → 2026-12-18Alaska AirlinesAS215 / AS460Axel-exclusive $410.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-18Sun Country Airlines / Delta Air LinesSY252 + SY285 / DL473Axel-exclusive $360.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-19Alaska AirlinesAS215 / AS279Axel-exclusive $492.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-19Sun Country Airlines / Delta Air LinesSY252 + SY285 / DL473Axel-exclusive $445.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-20Alaska AirlinesAS215 / AS214Axel-exclusive $492.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-20Sun Country Airlines / Delta Air LinesSY252 + SY285 / DL876Axel-exclusive $445.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-21Alaska AirlinesAS215 / AS214Axel-exclusive $492.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-21Sun Country Airlines / Alaska AirlinesSY252 + SY285 / AS214Axel-exclusive $434.502026-10-29T00:52:47Z
2026-12-10 → 2026-12-22Alaska AirlinesAS215 / AS214Axel-exclusive $492.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-22Sun Country Airlines / Alaska AirlinesSY252 + SY285 / AS214Axel-exclusive $434.502026-10-29T00:52:47Z
2026-12-10 → 2026-12-23Alaska AirlinesAS215 / AS279Axel-exclusive $492.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-23Sun Country Airlines / Alaska AirlinesSY252 + SY285 / AS279Axel-exclusive $434.502026-10-29T00:52:47Z
2026-12-10 → 2026-12-24Alaska AirlinesAS215 / AS460Axel-exclusive $492.002026-10-29T00:52:47Z
2026-12-10 → 2026-12-24Sun Country Airlines / Alaska AirlinesSY252 + SY285 / AS460Axel-exclusive $434.502026-10-29T00:52:47Z

Route overview: Boston to Seattle (SEA) flight deals

2026-12-10 · one way · Axel-exclusive $155.00

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.

2026-12-10 · one way · Axel-exclusive $215.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.

2026-12-10 → 2026-12-11 · Axel-exclusive $360.00

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Delta Air Lines DL473: SEA 2026-12-11 22:52:00 → BOS 2026-12-12 07:19:00; nonstop; 327 minutes. Local airport times.

2026-12-10 → 2026-12-11 · Axel-exclusive $410.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS460: SEA 2026-12-11 15:40:00 → BOS 2026-12-11 23:59:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-12 · Axel-exclusive $360.00

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Delta Air Lines DL473: SEA 2026-12-12 23:15:00 → BOS 2026-12-13 07:36:00; nonstop; 321 minutes. Local airport times.

2026-12-10 → 2026-12-12 · Axel-exclusive $410.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS214: SEA 2026-12-12 23:22:00 → BOS 2026-12-13 07:40:00; nonstop; 318 minutes. Local airport times.

2026-12-10 → 2026-12-13 · Axel-exclusive $352.50

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Alaska Airlines AS214: SEA 2026-12-13 21:21:00 → BOS 2026-12-14 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-13 · Axel-exclusive $410.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS214: SEA 2026-12-13 21:21:00 → BOS 2026-12-14 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-14 · Axel-exclusive $352.50

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Alaska Airlines AS214: SEA 2026-12-14 21:21:00 → BOS 2026-12-15 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-14 · Axel-exclusive $410.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS214: SEA 2026-12-14 21:21:00 → BOS 2026-12-15 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-16 · Axel-exclusive $352.50

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Alaska Airlines AS279: SEA 2026-12-16 09:00:00 → BOS 2026-12-16 17:19:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-16 · Axel-exclusive $410.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS279: SEA 2026-12-16 09:00:00 → BOS 2026-12-16 17:19:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-17 · Axel-exclusive $352.50

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Alaska Airlines AS460: SEA 2026-12-17 15:40:00 → BOS 2026-12-17 23:59:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-17 · Axel-exclusive $410.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS460: SEA 2026-12-17 15:40:00 → BOS 2026-12-17 23:59:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-18 · Axel-exclusive $360.00

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Delta Air Lines DL473: SEA 2026-12-18 22:52:00 → BOS 2026-12-19 07:19:00; nonstop; 327 minutes. Local airport times.

2026-12-10 → 2026-12-18 · Axel-exclusive $410.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS460: SEA 2026-12-18 15:40:00 → BOS 2026-12-18 23:59:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-20 · Axel-exclusive $445.00

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Delta Air Lines DL876: SEA 2026-12-20 15:55:00 → BOS 2026-12-21 00:13:00; nonstop; 318 minutes. Local airport times.

2026-12-10 → 2026-12-20 · Axel-exclusive $492.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS214: SEA 2026-12-20 21:21:00 → BOS 2026-12-21 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-21 · Axel-exclusive $434.50

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Alaska Airlines AS214: SEA 2026-12-21 21:21:00 → BOS 2026-12-22 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-21 · Axel-exclusive $492.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS214: SEA 2026-12-21 21:21:00 → BOS 2026-12-22 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-22 · Axel-exclusive $434.50

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Alaska Airlines AS214: SEA 2026-12-22 21:21:00 → BOS 2026-12-23 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-22 · Axel-exclusive $492.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS214: SEA 2026-12-22 21:21:00 → BOS 2026-12-23 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-10 → 2026-12-24 · Axel-exclusive $434.50

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-10 11:43:00 → SEA 2026-12-10 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-10 11:43:00 → MSP 2026-12-10 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-10 15:25:00 → SEA 2026-12-10 17:17:00.
  • Alaska Airlines AS460: SEA 2026-12-24 15:35:00 → BOS 2026-12-24 23:59:00; nonstop; 324 minutes. Local airport times.

2026-12-10 → 2026-12-24 · Axel-exclusive $492.00

  • Alaska Airlines AS215: BOS 2026-12-10 09:00:00 → SEA 2026-12-10 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS460: SEA 2026-12-24 15:35:00 → BOS 2026-12-24 23:59:00; nonstop; 324 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Boston (BOS) to Seattle (SEA) · Dec 10, 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 Boston to Seattle (SEA) 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.