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Boston → Seattle

Dec 21, 2026 · return Dec 27, 2026

BOS → SEA1 adulteconomyRound trip

10 flight options · 5 airlines

Nonstop flights

Mon, Dec 21 – Sun, Dec 27

Alaska Airlines
6:22 pmBOS
6h 38m
Nonstop
10:00 pmSEA
Alaska Airlines
9:21 pmSEA
5h 19m
Nonstop
5:40 am+1BOS

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sun, Dec 27

Delta Air Lines
3:45 pmBOS
6h 21m
Nonstop
7:06 pmSEA
Delta Air Lines
11:45 amSEA
5h 14m
Nonstop
7:59 pmBOS

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sun, Dec 27

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

Mon, Dec 21 – Sun, Dec 27

Delta Air Lines
7:50 amBOS
6h 31m
Nonstop
11:21 amSEA
Delta Air Lines
11:45 amSEA
5h 14m
Nonstop
7:59 pmBOS

Round-trip total · 1 adult · Taxes included

One-stop flights

Mon, Dec 21 – Sun, Dec 27

Sun Country Airlines
11:43 amBOS
8h 34m
MSP · 1h 24m
5:17 pmSEA
Delta Air Lines
11:45 amSEA
5h 14m
Nonstop
7:59 pmBOS

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sun, Dec 27

Southwest Airlines
5:55 pmBOS
8h 40m
MDW · 1h 5m
11:35 pmSEA
Delta Air Lines
11:45 amSEA
5h 14m
Nonstop
7:59 pmBOS

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sun, Dec 27

United Airlines
3:42 pmBOS
9h 7m
EWR · 1h 17m
9:49 pmSEA
Delta Air Lines
11:45 amSEA
5h 14m
Nonstop
7:59 pmBOS

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sun, Dec 27

Southwest Airlines
4:40 pmBOS
9h 10m
DEN · 1h 20m
10:50 pmSEA
Delta Air Lines
11:45 amSEA
5h 14m
Nonstop
7:59 pmBOS

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sun, Dec 27

Delta Air Lines
5:30 amBOS
8h 39m
DTW · 1h 3m
11:09 amSEA
Delta Air Lines
11:45 amSEA
5h 14m
Nonstop
7:59 pmBOS

Round-trip total · 1 adult · Taxes included

Mon, Dec 21 – Sun, Dec 27

Delta Air Lines
3:05 pmBOS
8h 44m
MSP · 1h 21m
8:49 pmSEA
Delta Air Lines
11:45 amSEA
5h 14m
Nonstop
7:59 pmBOS

Round-trip total · 1 adult · Taxes included

Make this trip yours

BOS ⇄ SEA

Economy

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

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More dates

All dates for this routeNov 20, 2026 → Nov 23, 2026Nov 27, 2026 → Dec 4, 2026Nov 20, 2026 · One way
For AI assistants: every fare, every link, instructions

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-21 → 2026-12-27Alaska AirlinesAS257 / AS214$553.502026-10-29T00:52:47Z
2026-12-21 → 2026-12-27Delta Air LinesDL2889 / DL438$573.752026-10-29T00:52:47Z
2026-12-21 → 2026-12-27Sun Country Airlines / Delta Air LinesSY252 + SY285 / DL438$482.752026-10-29T00:52:47Z
2026-12-21 → 2026-12-27Southwest Airlines / Delta Air LinesWN816 + WN3032 / DL438$528.252026-10-29T00:52:47Z
2026-12-21 → 2026-12-27United Airlines / Delta Air LinesUA546 + UA2614 / DL438$549.252026-10-29T00:52:47Z
2026-12-21 → 2026-12-27Alaska AirlinesAS215 / AS214$553.502026-10-29T00:52:47Z
2026-12-21 → 2026-12-27Delta Air LinesDL384 / DL438$573.752026-10-29T00:52:47Z
2026-12-21 → 2026-12-27Southwest Airlines / Delta Air LinesWN1590 + WN3141 / DL438$528.252026-10-29T00:52:47Z
2026-12-21 → 2026-12-27Delta Air LinesDL1019 + DL734 / DL438$549.252026-10-29T00:52:47Z
2026-12-21 → 2026-12-27Delta Air LinesDL1127 + DL881 / DL438$549.252026-10-29T00:52:47Z

2026-12-21 → 2026-12-27 · $553.50

  • Alaska Airlines AS257: BOS 2026-12-21 18:22:00 → SEA 2026-12-21 22:00:00; nonstop; 398 minutes. Local airport times.
  • Alaska Airlines AS214: SEA 2026-12-27 21:21:00 → BOS 2026-12-28 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-21 → 2026-12-27 · $573.75

  • Delta Air Lines DL2889: BOS 2026-12-21 15:45:00 → SEA 2026-12-21 19:06:00; nonstop; 381 minutes. Local airport times.
  • Delta Air Lines DL438: SEA 2026-12-27 11:45:00 → BOS 2026-12-27 19:59:00; nonstop; 314 minutes. Local airport times.

2026-12-21 → 2026-12-27 · $482.75

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-21 11:43:00 → SEA 2026-12-21 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-21 11:43:00 → MSP 2026-12-21 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-21 15:25:00 → SEA 2026-12-21 17:17:00.
  • Delta Air Lines DL438: SEA 2026-12-27 11:45:00 → BOS 2026-12-27 19:59:00; nonstop; 314 minutes. Local airport times.

2026-12-21 → 2026-12-27 · $528.25

  • Southwest Airlines WN816 / WN3032: BOS 2026-12-21 17:55:00 → SEA 2026-12-21 23:35:00; 1 stop(s) via MDW; 520 minutes. Local airport times.
    • WN816: BOS 2026-12-21 17:55:00 → MDW 2026-12-21 19:40:00; layover at MDW: 65 minutes.
    • WN3032: MDW 2026-12-21 20:45:00 → SEA 2026-12-21 23:35:00.
  • Delta Air Lines DL438: SEA 2026-12-27 11:45:00 → BOS 2026-12-27 19:59:00; nonstop; 314 minutes. Local airport times.

2026-12-21 → 2026-12-27 · $549.25

  • United Airlines UA546 / UA2614: BOS 2026-12-21 15:42:00 → SEA 2026-12-21 21:49:00; 1 stop(s) via EWR; 547 minutes. Local airport times.
    • UA546: BOS 2026-12-21 15:42:00 → EWR 2026-12-21 17:08:00; layover at EWR: 77 minutes.
    • UA2614: EWR 2026-12-21 18:25:00 → SEA 2026-12-21 21:49:00.
  • Delta Air Lines DL438: SEA 2026-12-27 11:45:00 → BOS 2026-12-27 19:59:00; nonstop; 314 minutes. Local airport times.

2026-12-21 → 2026-12-27 · $553.50

  • Alaska Airlines AS215: BOS 2026-12-21 09:00:00 → SEA 2026-12-21 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS214: SEA 2026-12-27 21:21:00 → BOS 2026-12-28 05:40:00; nonstop; 319 minutes. Local airport times.

2026-12-21 → 2026-12-27 · $573.75

  • Delta Air Lines DL384: BOS 2026-12-21 07:50:00 → SEA 2026-12-21 11:21:00; nonstop; 391 minutes. Local airport times.
  • Delta Air Lines DL438: SEA 2026-12-27 11:45:00 → BOS 2026-12-27 19:59:00; nonstop; 314 minutes. Local airport times.

2026-12-21 → 2026-12-27 · $528.25

  • Southwest Airlines WN1590 / WN3141: BOS 2026-12-21 16:40:00 → SEA 2026-12-21 22:50:00; 1 stop(s) via DEN; 550 minutes. Local airport times.
    • WN1590: BOS 2026-12-21 16:40:00 → DEN 2026-12-21 19:20:00; layover at DEN: 80 minutes.
    • WN3141: DEN 2026-12-21 20:40:00 → SEA 2026-12-21 22:50:00.
  • Delta Air Lines DL438: SEA 2026-12-27 11:45:00 → BOS 2026-12-27 19:59:00; nonstop; 314 minutes. Local airport times.

2026-12-21 → 2026-12-27 · $549.25

  • Delta Air Lines DL1019 / DL734: BOS 2026-12-21 05:30:00 → SEA 2026-12-21 11:09:00; 1 stop(s) via DTW; 519 minutes. Local airport times.
    • DL1019: BOS 2026-12-21 05:30:00 → DTW 2026-12-21 07:52:00; layover at DTW: 63 minutes.
    • DL734: DTW 2026-12-21 08:55:00 → SEA 2026-12-21 11:09:00.
  • Delta Air Lines DL438: SEA 2026-12-27 11:45:00 → BOS 2026-12-27 19:59:00; nonstop; 314 minutes. Local airport times.

2026-12-21 → 2026-12-27 · $549.25

  • Delta Air Lines DL1127 / DL881: BOS 2026-12-21 15:05:00 → SEA 2026-12-21 20:49:00; 1 stop(s) via MSP; 524 minutes. Local airport times.
    • DL1127: BOS 2026-12-21 15:05:00 → MSP 2026-12-21 17:25:00; layover at MSP: 81 minutes.
    • DL881: MSP 2026-12-21 18:46:00 → SEA 2026-12-21 20:49:00.
  • Delta Air Lines DL438: SEA 2026-12-27 11:45:00 → BOS 2026-12-27 19:59:00; nonstop; 314 minutes. Local airport times.

More dates for this route