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Route overview: Seattle to Boston (BOS) flight deals

Seattle → Boston

Dec 5, 2026 · return Dec 19, 2026

SEA → BOS1 adulteconomyRound trip

10 flight options · 3 airlines

Nonstop flights

Sat, Dec 5 – Sat, Dec 19

Alaska Airlines
8:51 amSEA
5h 25m
Nonstop
5:16 pmBOS
Alaska Airlines
7:00 amBOS
6h 38m
Nonstop
10:38 amSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Sat, Dec 5 – Sat, Dec 19

Delta Air Lines
3:55 pmSEA
5h 18m
Nonstop
12:13 am+1BOS
Delta Air Lines
6:15 pmBOS
6h 26m
Nonstop
9:41 pmSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Sat, Dec 5 – Sat, Dec 19

Alaska Airlines
11:22 pmSEA
5h 18m
Nonstop
7:40 am+1BOS
Alaska Airlines
7:00 amBOS
6h 38m
Nonstop
10:38 amSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Sat, Dec 5 – Sat, Dec 19

Delta Air Lines
11:15 pmSEA
5h 21m
Nonstop
7:36 am+1BOS
Delta Air Lines
6:15 pmBOS
6h 26m
Nonstop
9:41 pmSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

One-stop flights

Sat, Dec 5 – Sat, Dec 19

American Airlines
12:34 pmSEA
7h 39m
PHL · 1h 15m
11:13 pmBOS
Delta Air Lines
6:15 pmBOS
6h 26m
Nonstop
9:41 pmSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Sat, Dec 5 – Sat, Dec 19

Alaska Airlines
2:02 pmSEA
7h 19m
DCA · 1h
12:21 am+1BOS
Alaska Airlines
7:00 amBOS
6h 38m
Nonstop
10:38 amSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Sat, Dec 5 – Sat, Dec 19

Alaska Airlines
7:54 pmSEA
7h 26m
PDX · 1h 9m
6:20 am+1BOS
Alaska Airlines
7:00 amBOS
6h 38m
Nonstop
10:38 amSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Sat, Dec 5 – Sat, Dec 19

Alaska Airlines
9:16 amSEA
7h 39m
STL · 1h 9m
7:55 pmBOS
Alaska Airlines
7:00 amBOS
6h 38m
Nonstop
10:38 amSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Sat, Dec 5 – Sat, Dec 19

American Airlines
11:59 pmSEA
7h 33m
ORD · 1h 4m
10:32 am+1BOS
Delta Air Lines
6:15 pmBOS
6h 26m
Nonstop
9:41 pmSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Sat, Dec 5 – Sat, Dec 19

Delta Air Lines
1:25 pmSEA
7h 32m
SLC · 1h 10m
11:57 pmBOS
Delta Air Lines
6:15 pmBOS
6h 26m
Nonstop
9:41 pmSEA

Round-trip total · 1 adult · Taxes included

Availability is checked when you select these flights.

Make this trip yours

SEA ⇄ BOS

Economy

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

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Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner. How Axel works · About

Explore this route

All dates for this routeDec 4, 2026 · Return optionsDec 6, 2026 · Return optionsHotels in Boston 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)
2026-12-05 → 2026-12-19Alaska AirlinesAS279 / AS459Axel-exclusive $474.002026-10-29T00:39:14Z
2026-12-05 → 2026-12-19Delta Air LinesDL876 / DL797Axel-exclusive $498.002026-10-29T00:39:14Z
2026-12-05 → 2026-12-19American Airlines / Delta Air LinesAA2203 + AA1874 / DL797Axel-exclusive $460.502026-10-29T00:39:14Z
2026-12-05 → 2026-12-19Alaska AirlinesAS214 / AS459Axel-exclusive $474.002026-10-29T00:39:14Z
2026-12-05 → 2026-12-19Delta Air LinesDL473 / DL797Axel-exclusive $498.002026-10-29T00:39:14Z
2026-12-05 → 2026-12-19Alaska AirlinesAS2 + AA1152 / AS459Axel-exclusive $456.502026-10-29T00:39:14Z
2026-12-05 → 2026-12-19Alaska AirlinesAS2239 + AS436 / AS459Axel-exclusive $456.502026-10-29T00:39:14Z
2026-12-05 → 2026-12-19Alaska AirlinesAS314 + AA4801 / AS459Axel-exclusive $456.502026-10-29T00:39:14Z
2026-12-05 → 2026-12-19American Airlines / Delta Air LinesAA2379 + AA2089 / DL797Axel-exclusive $460.502026-10-29T00:39:14Z
2026-12-05 → 2026-12-19Delta Air LinesDL1120 + DL702 / DL797Axel-exclusive $475.502026-10-29T00:39:14Z

Route overview: Seattle to Boston (BOS) flight deals

2026-12-05 → 2026-12-19 · Axel-exclusive $474.00

  • Alaska Airlines AS279: SEA 2026-12-05 08:51:00 → BOS 2026-12-05 17:16:00; nonstop; 325 minutes. Local airport times.
  • Alaska Airlines AS459: BOS 2026-12-19 07:00:00 → SEA 2026-12-19 10:38:00; nonstop; 398 minutes. Local airport times.

2026-12-05 → 2026-12-19 · Axel-exclusive $498.00

  • Delta Air Lines DL876: SEA 2026-12-05 15:55:00 → BOS 2026-12-06 00:13:00; nonstop; 318 minutes. Local airport times.
  • Delta Air Lines DL797: BOS 2026-12-19 18:15:00 → SEA 2026-12-19 21:41:00; nonstop; 386 minutes. Local airport times.

2026-12-05 → 2026-12-19 · Axel-exclusive $460.50

  • American Airlines AA2203 / AA1874: SEA 2026-12-05 12:34:00 → BOS 2026-12-05 23:13:00; 1 stop(s) via PHL; 459 minutes. Local airport times.
    • AA2203: SEA 2026-12-05 12:34:00 → PHL 2026-12-05 20:35:00; layover at PHL: 75 minutes.
    • AA1874: PHL 2026-12-05 21:50:00 → BOS 2026-12-05 23:13:00.
  • Delta Air Lines DL797: BOS 2026-12-19 18:15:00 → SEA 2026-12-19 21:41:00; nonstop; 386 minutes. Local airport times.

2026-12-05 → 2026-12-19 · Axel-exclusive $474.00

  • Alaska Airlines AS214: SEA 2026-12-05 23:22:00 → BOS 2026-12-06 07:40:00; nonstop; 318 minutes. Local airport times.
  • Alaska Airlines AS459: BOS 2026-12-19 07:00:00 → SEA 2026-12-19 10:38:00; nonstop; 398 minutes. Local airport times.

2026-12-05 → 2026-12-19 · Axel-exclusive $498.00

  • Delta Air Lines DL473: SEA 2026-12-05 23:15:00 → BOS 2026-12-06 07:36:00; nonstop; 321 minutes. Local airport times.
  • Delta Air Lines DL797: BOS 2026-12-19 18:15:00 → SEA 2026-12-19 21:41:00; nonstop; 386 minutes. Local airport times.

2026-12-05 → 2026-12-19 · Axel-exclusive $456.50

  • Alaska Airlines AS2 / AA1152: SEA 2026-12-05 14:02:00 → BOS 2026-12-06 00:21:00; 1 stop(s) via DCA; 439 minutes. Local airport times.
    • AS2: SEA 2026-12-05 14:02:00 → DCA 2026-12-05 21:59:00; layover at DCA: 60 minutes.
    • AA1152: DCA 2026-12-05 22:59:00 → BOS 2026-12-06 00:21:00.
  • Alaska Airlines AS459: BOS 2026-12-19 07:00:00 → SEA 2026-12-19 10:38:00; nonstop; 398 minutes. Local airport times.

2026-12-05 → 2026-12-19 · Axel-exclusive $456.50

  • Alaska Airlines AS2239 / AS436: SEA 2026-12-05 19:54:00 → BOS 2026-12-06 06:20:00; 1 stop(s) via PDX; 446 minutes. Local airport times.
    • AS2239: SEA 2026-12-05 19:54:00 → PDX 2026-12-05 20:50:00; layover at PDX: 69 minutes.
    • AS436: PDX 2026-12-05 21:59:00 → BOS 2026-12-06 06:20:00.
  • Alaska Airlines AS459: BOS 2026-12-19 07:00:00 → SEA 2026-12-19 10:38:00; nonstop; 398 minutes. Local airport times.

2026-12-05 → 2026-12-19 · Axel-exclusive $456.50

  • Alaska Airlines AS314 / AA4801: SEA 2026-12-05 09:16:00 → BOS 2026-12-05 19:55:00; 1 stop(s) via STL; 459 minutes. Local airport times.
    • AS314: SEA 2026-12-05 09:16:00 → STL 2026-12-05 15:06:00; layover at STL: 69 minutes.
    • AA4801: STL 2026-12-05 16:15:00 → BOS 2026-12-05 19:55:00.
  • Alaska Airlines AS459: BOS 2026-12-19 07:00:00 → SEA 2026-12-19 10:38:00; nonstop; 398 minutes. Local airport times.

2026-12-05 → 2026-12-19 · Axel-exclusive $460.50

  • American Airlines AA2379 / AA2089: SEA 2026-12-05 23:59:00 → BOS 2026-12-06 10:32:00; 1 stop(s) via ORD; 453 minutes. Local airport times.
    • AA2379: SEA 2026-12-05 23:59:00 → ORD 2026-12-06 05:55:00; layover at ORD: 64 minutes.
    • AA2089: ORD 2026-12-06 06:59:00 → BOS 2026-12-06 10:32:00.
  • Delta Air Lines DL797: BOS 2026-12-19 18:15:00 → SEA 2026-12-19 21:41:00; nonstop; 386 minutes. Local airport times.

2026-12-05 → 2026-12-19 · Axel-exclusive $475.50

  • Delta Air Lines DL1120 / DL702: SEA 2026-12-05 13:25:00 → BOS 2026-12-05 23:57:00; 1 stop(s) via SLC; 452 minutes. Local airport times.
    • DL1120: SEA 2026-12-05 13:25:00 → SLC 2026-12-05 16:26:00; layover at SLC: 70 minutes.
    • DL702: SLC 2026-12-05 17:36:00 → BOS 2026-12-05 23:57:00.
  • Delta Air Lines DL797: BOS 2026-12-19 18:15:00 → SEA 2026-12-19 21:41:00; nonstop; 386 minutes. Local airport times.

Explore this route

For AI assistants

  • This page: Seattle (SEA) to Boston (BOS) · Dec 5, 2026 · return Dec 19, 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.
  • 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 Seattle 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. 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.