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Route overview: Boston to Seattle (SEA) flight deals

Boston → Seattle

Jan 21, 2027 · one way

BOS → SEA1 adulteconomyOne way

10 flight options · 5 airlines

Nonstop flights

Thu, Jan 21 · One way

Alaska Airlines
6:22 pmBOS
6h 38m
Nonstop
10:00 pmSEA

One-way total · 1 adult · Taxes included

Availability is checked when you select these flights.

Thu, Jan 21 · One way

Delta Air Lines
7:30 amBOS
6h 35m
Nonstop
11:05 amSEA

One-way total · 1 adult · Taxes included

Availability is checked when you select these flights.

Thu, Jan 21 · 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.

Thu, Jan 21 · One way

Delta Air Lines
6:15 pmBOS
6h 26m
Nonstop
9:41 pmSEA

One-way total · 1 adult · Taxes included

Availability is checked when you select these flights.

One-stop flights

Thu, Jan 21 · 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.

Thu, Jan 21 · One way

Southwest Airlines
5:55 pmBOS
8h 40m
MDW · 1h 5m
11:35 pmSEA

One-way total · 1 adult · Taxes included

Availability is checked when you select these flights.

Thu, Jan 21 · One way

United Airlines
3:42 pmBOS
9h 7m
EWR · 1h 17m
9:49 pmSEA

One-way total · 1 adult · Taxes included

Availability is checked when you select these flights.

Thu, Jan 21 · One way

Southwest Airlines
4:40 pmBOS
9h 10m
DEN · 1h 20m
10:50 pmSEA

One-way total · 1 adult · Taxes included

Availability is checked when you select these flights.

Thu, Jan 21 · One way

Delta Air Lines
3:05 pmBOS
8h 44m
MSP · 1h 21m
8:49 pmSEA

One-way total · 1 adult · Taxes included

Availability is checked when you select these flights.

Thu, Jan 21 · One way

Delta Air Lines
5:30 amBOS
8h 39m
DTW · 1h 3m
11:09 amSEA

One-way total · 1 adult · Taxes included

Availability is checked when you select these flights.

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 routeJan 20, 2027 · Return optionsJan 22, 2027 · 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.

See flights for these dates: each price link opens AI flight search for that row's exact dates and travelers. Select the complete itinerary there.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2027-01-21 · one wayAlaska AirlinesAS257Axel-exclusive $215.002026-10-29T00:52:47Z
2027-01-21 · one wayDelta Air LinesDL384Axel-exclusive $225.002026-10-29T00:52:47Z
2027-01-21 · one waySun Country AirlinesSY252 + SY285Axel-exclusive $155.002026-10-29T00:52:47Z
2027-01-21 · one waySouthwest AirlinesWN816 + WN3032Axel-exclusive $190.002026-10-29T00:52:47Z
2027-01-21 · one wayUnited AirlinesUA546 + UA2614Axel-exclusive $205.002026-10-29T00:52:47Z
2027-01-21 · one wayAlaska AirlinesAS215Axel-exclusive $215.002026-10-29T00:52:47Z
2027-01-21 · one wayDelta Air LinesDL797Axel-exclusive $225.002026-10-29T00:52:47Z
2027-01-21 · one waySouthwest AirlinesWN1590 + WN3141Axel-exclusive $190.002026-10-29T00:52:47Z
2027-01-21 · one wayDelta Air LinesDL1127 + DL881Axel-exclusive $205.002026-10-29T00:52:47Z
2027-01-21 · one wayDelta Air LinesDL1019 + DL734Axel-exclusive $205.002026-10-29T00:52:47Z

Route overview: Boston to Seattle (SEA) flight deals

2027-01-21 · one way · Axel-exclusive $215.00

  • Alaska Airlines AS257: BOS 2027-01-21 18:22:00 → SEA 2027-01-21 22:00:00; nonstop; 398 minutes. Local airport times.

2027-01-21 · one way · Axel-exclusive $225.00

  • Delta Air Lines DL384: BOS 2027-01-21 07:30:00 → SEA 2027-01-21 11:05:00; nonstop; 395 minutes. Local airport times.

2027-01-21 · one way · Axel-exclusive $155.00

  • Sun Country Airlines SY252 / SY285: BOS 2027-01-21 11:43:00 → SEA 2027-01-21 17:17:00; 1 stop(s) via MSP; 514 minutes. Local airport times.
    • SY252: BOS 2027-01-21 11:43:00 → MSP 2027-01-21 14:01:00; layover at MSP: 84 minutes.
    • SY285: MSP 2027-01-21 15:25:00 → SEA 2027-01-21 17:17:00.

2027-01-21 · one way · Axel-exclusive $190.00

  • Southwest Airlines WN816 / WN3032: BOS 2027-01-21 17:55:00 → SEA 2027-01-21 23:35:00; 1 stop(s) via MDW; 520 minutes. Local airport times.
    • WN816: BOS 2027-01-21 17:55:00 → MDW 2027-01-21 19:40:00; layover at MDW: 65 minutes.
    • WN3032: MDW 2027-01-21 20:45:00 → SEA 2027-01-21 23:35:00.

2027-01-21 · one way · Axel-exclusive $205.00

  • United Airlines UA546 / UA2614: BOS 2027-01-21 15:42:00 → SEA 2027-01-21 21:49:00; 1 stop(s) via EWR; 547 minutes. Local airport times.
    • UA546: BOS 2027-01-21 15:42:00 → EWR 2027-01-21 17:08:00; layover at EWR: 77 minutes.
    • UA2614: EWR 2027-01-21 18:25:00 → SEA 2027-01-21 21:49:00.

2027-01-21 · one way · Axel-exclusive $215.00

  • Alaska Airlines AS215: BOS 2027-01-21 09:00:00 → SEA 2027-01-21 12:37:00; nonstop; 397 minutes. Local airport times.

2027-01-21 · one way · Axel-exclusive $225.00

  • Delta Air Lines DL797: BOS 2027-01-21 18:15:00 → SEA 2027-01-21 21:41:00; nonstop; 386 minutes. Local airport times.

2027-01-21 · one way · Axel-exclusive $190.00

  • Southwest Airlines WN1590 / WN3141: BOS 2027-01-21 16:40:00 → SEA 2027-01-21 22:50:00; 1 stop(s) via DEN; 550 minutes. Local airport times.
    • WN1590: BOS 2027-01-21 16:40:00 → DEN 2027-01-21 19:20:00; layover at DEN: 80 minutes.
    • WN3141: DEN 2027-01-21 20:40:00 → SEA 2027-01-21 22:50:00.

2027-01-21 · one way · Axel-exclusive $205.00

  • Delta Air Lines DL1127 / DL881: BOS 2027-01-21 15:05:00 → SEA 2027-01-21 20:49:00; 1 stop(s) via MSP; 524 minutes. Local airport times.
    • DL1127: BOS 2027-01-21 15:05:00 → MSP 2027-01-21 17:25:00; layover at MSP: 81 minutes.
    • DL881: MSP 2027-01-21 18:46:00 → SEA 2027-01-21 20:49:00.

2027-01-21 · one way · Axel-exclusive $205.00

  • Delta Air Lines DL1019 / DL734: BOS 2027-01-21 05:30:00 → SEA 2027-01-21 11:09:00; 1 stop(s) via DTW; 519 minutes. Local airport times.
    • DL1019: BOS 2027-01-21 05:30:00 → DTW 2027-01-21 07:52:00; layover at DTW: 63 minutes.
    • DL734: DTW 2027-01-21 08:55:00 → SEA 2027-01-21 11:09:00.

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For AI assistants

  • This page: Boston (BOS) to Seattle (SEA) · Jan 21, 2027 · one way: 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.
  • 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.