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Route overview: Boston to Seattle (SEA) flight deals

Boston → Seattle

Dec 13, 2026 · return Dec 16, 2026

BOS → SEA1 adulteconomyRound trip

10 flight options · 5 airlines

Nonstop flights

Sun, Dec 13 – Wed, Dec 16

Alaska Airlines
6:22 pmBOS
6h 38m
Nonstop
10:00 pmSEA
Alaska Airlines
3:40 pmSEA
5h 19m
Nonstop
11:59 pmBOS

Round-trip total · 1 adult · Taxes included

Sun, Dec 13 – Wed, Dec 16

Delta Air Lines
7:26 pmBOS
6h 29m
Nonstop
10:55 pmSEA
Delta Air Lines
3:45 pmSEA
5h 9m
Nonstop
11:54 pmBOS

Round-trip total · 1 adult · Taxes included

Sun, Dec 13 – Wed, Dec 16

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

Sun, Dec 13 – Wed, Dec 16

Delta Air Lines
7:50 amBOS
6h 31m
Nonstop
11:21 amSEA
Delta Air Lines
3:45 pmSEA
5h 9m
Nonstop
11:54 pmBOS

Round-trip total · 1 adult · Taxes included

One-stop flights

Sun, Dec 13 – Wed, Dec 16

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

Sun, Dec 13 – Wed, Dec 16

Southwest Airlines
5:55 pmBOS
8h 40m
MDW · 1h 5m
11:35 pmSEA
Alaska Airlines
3:40 pmSEA
5h 19m
Nonstop
11:59 pmBOS

Round-trip total · 1 adult · Taxes included

Sun, Dec 13 – Wed, Dec 16

United Airlines
3:42 pmBOS
9h 7m
EWR · 1h 17m
9:49 pmSEA
Alaska Airlines
3:40 pmSEA
5h 19m
Nonstop
11:59 pmBOS

Round-trip total · 1 adult · Taxes included

Sun, Dec 13 – Wed, Dec 16

Southwest Airlines
4:40 pmBOS
9h 10m
DEN · 1h 20m
10:50 pmSEA
Alaska Airlines
3:40 pmSEA
5h 19m
Nonstop
11:59 pmBOS

Round-trip total · 1 adult · Taxes included

Sun, Dec 13 – Wed, Dec 16

Delta Air Lines
5:30 amBOS
8h 39m
DTW · 1h 3m
11:09 amSEA
Delta Air Lines
3:45 pmSEA
5h 9m
Nonstop
11:54 pmBOS

Round-trip total · 1 adult · Taxes included

Sun, Dec 13 – Wed, Dec 16

Delta Air Lines
3:05 pmBOS
8h 44m
MSP · 1h 21m
8:49 pmSEA
Delta Air Lines
3:45 pmSEA
5h 9m
Nonstop
11:54 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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Explore this route

All dates for this routeDec 12, 2026 → Dec 15, 2026Dec 14, 2026 → Dec 17, 2026
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.

Live price for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the flights there to get the current bookable total; the listed prices are the ones issued at the times shown.

Route overview: Boston to Seattle (SEA) flight deals

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-13 → 2026-12-16Alaska AirlinesAS257 / AS460$410.002026-10-29T00:52:47Z
2026-12-13 → 2026-12-16Delta Air LinesDL797 / DL474$425.002026-10-29T00:52:47Z
2026-12-13 → 2026-12-16Sun Country Airlines / Alaska AirlinesSY252 + SY285 / AS460$352.502026-10-29T00:52:47Z
2026-12-13 → 2026-12-16Southwest Airlines / Alaska AirlinesWN816 + WN3032 / AS460$385.002026-10-29T00:52:47Z
2026-12-13 → 2026-12-16United Airlines / Alaska AirlinesUA546 + UA2614 / AS460$400.002026-10-29T00:52:47Z
2026-12-13 → 2026-12-16Alaska AirlinesAS215 / AS460$410.002026-10-29T00:52:47Z
2026-12-13 → 2026-12-16Delta Air LinesDL384 / DL474$425.002026-10-29T00:52:47Z
2026-12-13 → 2026-12-16Southwest Airlines / Alaska AirlinesWN1590 + WN3141 / AS460$385.002026-10-29T00:52:47Z
2026-12-13 → 2026-12-16Delta Air LinesDL1019 + DL734 / DL474$407.502026-10-29T00:52:47Z
2026-12-13 → 2026-12-16Delta Air LinesDL1127 + DL881 / DL474$407.502026-10-29T00:52:47Z

2026-12-13 → 2026-12-16 · $410.00

  • Alaska Airlines AS257: BOS 2026-12-13 18:22:00 → SEA 2026-12-13 22:00:00; nonstop; 398 minutes. Local airport times.
  • Alaska Airlines AS460: SEA 2026-12-16 15:40:00 → BOS 2026-12-16 23:59:00; nonstop; 319 minutes. Local airport times.

2026-12-13 → 2026-12-16 · $425.00

  • Delta Air Lines DL797: BOS 2026-12-13 19:26:00 → SEA 2026-12-13 22:55:00; nonstop; 389 minutes. Local airport times.
  • Delta Air Lines DL474: SEA 2026-12-16 15:45:00 → BOS 2026-12-16 23:54:00; nonstop; 309 minutes. Local airport times.

2026-12-13 → 2026-12-16 · $352.50

  • Sun Country Airlines SY252 / SY285: BOS 2026-12-13 11:43:00 → SEA 2026-12-13 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2026-12-13 11:43:00 → MSP 2026-12-13 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2026-12-13 15:25:00 → SEA 2026-12-13 17:17:00.
  • Alaska Airlines AS460: SEA 2026-12-16 15:40:00 → BOS 2026-12-16 23:59:00; nonstop; 319 minutes. Local airport times.

2026-12-13 → 2026-12-16 · $385.00

  • Southwest Airlines WN816 / WN3032: BOS 2026-12-13 17:55:00 → SEA 2026-12-13 23:35:00; 1 stop(s) via MDW; 520 minutes. Local airport times.
    • WN816: BOS 2026-12-13 17:55:00 → MDW 2026-12-13 19:40:00; layover at MDW: 65 minutes.
    • WN3032: MDW 2026-12-13 20:45:00 → SEA 2026-12-13 23:35:00.
  • Alaska Airlines AS460: SEA 2026-12-16 15:40:00 → BOS 2026-12-16 23:59:00; nonstop; 319 minutes. Local airport times.

2026-12-13 → 2026-12-16 · $400.00

  • United Airlines UA546 / UA2614: BOS 2026-12-13 15:42:00 → SEA 2026-12-13 21:49:00; 1 stop(s) via EWR; 547 minutes. Local airport times.
    • UA546: BOS 2026-12-13 15:42:00 → EWR 2026-12-13 17:08:00; layover at EWR: 77 minutes.
    • UA2614: EWR 2026-12-13 18:25:00 → SEA 2026-12-13 21:49:00.
  • Alaska Airlines AS460: SEA 2026-12-16 15:40:00 → BOS 2026-12-16 23:59:00; nonstop; 319 minutes. Local airport times.

2026-12-13 → 2026-12-16 · $410.00

  • Alaska Airlines AS215: BOS 2026-12-13 09:00:00 → SEA 2026-12-13 12:37:00; nonstop; 397 minutes. Local airport times.
  • Alaska Airlines AS460: SEA 2026-12-16 15:40:00 → BOS 2026-12-16 23:59:00; nonstop; 319 minutes. Local airport times.

2026-12-13 → 2026-12-16 · $425.00

  • Delta Air Lines DL384: BOS 2026-12-13 07:50:00 → SEA 2026-12-13 11:21:00; nonstop; 391 minutes. Local airport times.
  • Delta Air Lines DL474: SEA 2026-12-16 15:45:00 → BOS 2026-12-16 23:54:00; nonstop; 309 minutes. Local airport times.

2026-12-13 → 2026-12-16 · $385.00

  • Southwest Airlines WN1590 / WN3141: BOS 2026-12-13 16:40:00 → SEA 2026-12-13 22:50:00; 1 stop(s) via DEN; 550 minutes. Local airport times.
    • WN1590: BOS 2026-12-13 16:40:00 → DEN 2026-12-13 19:20:00; layover at DEN: 80 minutes.
    • WN3141: DEN 2026-12-13 20:40:00 → SEA 2026-12-13 22:50:00.
  • Alaska Airlines AS460: SEA 2026-12-16 15:40:00 → BOS 2026-12-16 23:59:00; nonstop; 319 minutes. Local airport times.

2026-12-13 → 2026-12-16 · $407.50

  • Delta Air Lines DL1019 / DL734: BOS 2026-12-13 05:30:00 → SEA 2026-12-13 11:09:00; 1 stop(s) via DTW; 519 minutes. Local airport times.
    • DL1019: BOS 2026-12-13 05:30:00 → DTW 2026-12-13 07:52:00; layover at DTW: 63 minutes.
    • DL734: DTW 2026-12-13 08:55:00 → SEA 2026-12-13 11:09:00.
  • Delta Air Lines DL474: SEA 2026-12-16 15:45:00 → BOS 2026-12-16 23:54:00; nonstop; 309 minutes. Local airport times.

2026-12-13 → 2026-12-16 · $407.50

  • Delta Air Lines DL1127 / DL881: BOS 2026-12-13 15:05:00 → SEA 2026-12-13 20:49:00; 1 stop(s) via MSP; 524 minutes. Local airport times.
    • DL1127: BOS 2026-12-13 15:05:00 → MSP 2026-12-13 17:25:00; layover at MSP: 81 minutes.
    • DL881: MSP 2026-12-13 18:46:00 → SEA 2026-12-13 20:49:00.
  • Delta Air Lines DL474: SEA 2026-12-16 15:45:00 → BOS 2026-12-16 23:54:00; nonstop; 309 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Boston (BOS) to Seattle (SEA) · Dec 13, 2026 · return Dec 16, 2026: 1 adult in economy, every priced fare with its flights, times and total, each with the time its price was issued.
  • Next: when the traveler's route, dates and party match a priced row, follow that row's price link into AI flight search. Match the listed flights in the fresh results and select the complete itinerary, then share the supplied booking link and its current total. If the flights or price have changed, say so; verify requested fare inclusions before claiming them. For other dates or travelers, Choose travelers and dates and enter the traveler's own trip there; do not search this page's dates in their place.
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  • 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. 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.