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Boston Logan International Airport to Seattle-Tacoma International Airport flight

Explore the cheapest one-way and round-trip flights from Boston Logan International Airport to Seattle-Tacoma International Airport over the next 90 days, with one-way fares from US$167 and round-trip from US$322. Based on Trip.com's latest 7-day flight data.

    • Cheapest
      BOS 10:44 AM
      11h 15m
      1 stop
      SEA 6:59 PM
      Boston - Seattle | Wed, Dec 9 | United Airlines
      US$167 US$224
      25% off
      25% off
      US$224 US$167
    • Cheapest
      BOS 4:33 PM
      9h 27m
      1 stop
      SEA 11:00 PM
      Boston - Seattle | Fri, Nov 13 | Alaska Airlines
      US$167 US$224
      25% off
      25% off
      US$224 US$167
    • BOS 6:13 PM
      18h 19m
      1 stop
      SEA 9:32 AM
      Boston - Seattle | Thu, Dec 10 | Alaska Airlines
      US$170 US$224
      24% off
      24% off
      US$224 US$170
    • BOS 7:51 AM
      13h 11m
      1 stop
      SEA 6:02 PM
      Boston - Seattle | Wed, Oct 28 | Alaska Airlines
      US$171
      24% off
      US$224 US$171
    • BOS 7:03 AM
      12h 53m
      1 stop
      SEA 4:56 PM
      Boston - Seattle | Thu, Nov 12 | Alaska Airlines
      US$173
      23% off
      US$224 US$173
    • BOS 7:03 AM
      10h 42m
      1 stop
      SEA 2:45 PM
      Boston - Seattle | Tue, Nov 17 | Alaska Airlines
      US$177
      21% off
      US$224 US$177
    • BOS 3:00 PM
      9h 59m
      1 stop
      SEA 9:59 PM
      Boston - Seattle | Tue, Nov 10 | American Airlines
      US$179
      20% off
      US$224 US$179
    • BOS 4:33 PM
      6h 26m
      Nonstop
      SEA 7:59 PM
      Boston - Seattle | Sat, Nov 14 | Alaska Airlines
      US$179
      20% off
      US$224 US$179
    • BOS 7:13 AM
      6h 26m
      Nonstop
      SEA 10:39 AM
      Boston - Seattle | Mon, Nov 16 | Alaska Airlines
      US$179
      20% off
      US$224 US$179
    • BOS 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      Boston - Seattle | Thu, Oct 29 | Normal Airline
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    • Cheapest nonstop
      BOS 6:22 PM
      6h 38m
      Nonstop
      SEA 10:00 PM
      Boston - Seattle | Mon, Dec 7 | Alaska Airlines
      SEA 3:40 PM
      5h 19m
      Nonstop
      BOS 11:59 PM
      Seattle - Boston | Wed, Dec 9 | Alaska Airlines
      US$352 US$449
      22% off
      22% off
      US$449 US$352
    • BOS 10:40 AM
      6h 23m
      Nonstop
      SEA 2:03 PM
      Boston - Seattle | Wed, Nov 25 | Delta Air Lines
      SEA 3:40 PM
      5h 19m
      Nonstop
      BOS 11:59 PM
      Seattle - Boston | Tue, Dec 1 | Alaska Airlines
      US$359 US$449
      20% off
      20% off
      US$449 US$359
    • BOS 7:25 PM
      6h 30m
      Nonstop
      SEA 10:55 PM
      Boston - Seattle | Fri, Nov 20 | Delta Air Lines
      SEA 8:40 AM
      5h 21m
      Nonstop
      BOS 5:01 PM
      Seattle - Boston | Fri, Nov 27 | Alaska Airlines
      US$359 US$449
      20% off
      20% off
      US$449 US$359
    • BOS 10:40 AM
      6h 29m
      Nonstop
      SEA 2:09 PM
      Boston - Seattle | Mon, Dec 7 | Delta Air Lines
      SEA 9:00 AM
      5h 19m
      Nonstop
      BOS 5:19 PM
      Seattle - Boston | Wed, Dec 9 | Alaska Airlines
      US$359
      20% off
      US$449 US$359
    • BOS 6:13 PM
      30h 44m
      1 stop
      SEA 9:57 PM
      Boston - Seattle | Mon, Dec 14 | Alaska Airlines
      SEA 10:35 AM
      15h 53m
      1 stop
      BOS 5:28 AM
      Seattle - Boston | Wed, Dec 16 | Alaska Airlines
      US$322
      28% off
      US$449 US$322
    • BOS 5:44 PM
      6h 24m
      Nonstop
      SEA 9:08 PM
      Boston - Seattle | Tue, Nov 10 | Alaska Airlines
      SEA 6:10 AM
      7h 40m
      1 stop
      BOS 4:50 PM
      Seattle - Boston | Tue, Nov 17 |
      US$331
      26% off
      US$449 US$331
    • BOS 7:50 AM
      6h 27m
      Nonstop
      SEA 11:17 AM
      Boston - Seattle | Tue, Nov 10 | Delta Air Lines
      SEA 7:00 AM
      9h 50m
      1 stop
      BOS 7:50 PM
      Seattle - Boston | Tue, Nov 17 |
      US$335
      25% off
      US$449 US$335
    • BOS 7:03 AM
      10h 42m
      1 stop
      SEA 2:45 PM
      Boston - Seattle | Fri, Nov 13 | Alaska Airlines
      SEA 5:19 PM
      9h 27m
      1 stop
      BOS 5:46 AM
      Seattle - Boston | Mon, Nov 16 | Alaska Airlines
      US$340
      24% off
      US$449 US$340
    • BOS 7:51 AM
      13h 11m
      1 stop
      SEA 6:02 PM
      Boston - Seattle | Thu, Oct 29 | Alaska Airlines
      SEA 5:19 PM
      9h 27m
      1 stop
      BOS 5:46 AM
      Seattle - Boston | Mon, Nov 2 | Alaska Airlines
      US$340
      24% off
      US$449 US$340
    • BOS 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      Boston - Seattle | Thu, Oct 29 | Normal Airline
      SEA 3:00 PM
      6h
      Nonstop
      BOS 4:00 PM
      Seattle - Boston | Sat, Oct 31 | Normal Airline
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    • Cheapest nonstop
      BOS 4:33 PM
      6h 26m
      Nonstop
      SEA 7:59 PM
      Boston - Seattle | Sat, Nov 14 | Alaska Airlines
      US$179 US$224
      20% off
      20% off
      US$224 US$179
    • BOS 7:13 AM
      6h 26m
      Nonstop
      SEA 10:39 AM
      Boston - Seattle | Mon, Nov 16 | Alaska Airlines
      US$179 US$224
      20% off
      20% off
      US$224 US$179
    • BOS 3:45 PM
      6h 21m
      Nonstop
      SEA 7:06 PM
      Boston - Seattle | Mon, Nov 16 | Delta Air Lines
      US$184 US$882
      79% off
      79% off
      US$882 US$184
    • BOS 7:13 AM
      6h 26m
      Nonstop
      SEA 10:39 AM
      Boston - Seattle | Sun, Nov 8 | Alaska Airlines
      US$211
      61% off
      US$547 US$211
    • BOS 7:00 AM
      6h 28m
      Nonstop
      SEA 10:28 AM
      Boston - Seattle | Sat, Nov 21 | Alaska Airlines
      US$215
      61% off
      US$547 US$215
    • BOS 6:22 PM
      6h 38m
      Nonstop
      SEA 10:00 PM
      Boston - Seattle | Mon, Dec 7 | Alaska Airlines
      US$219
      60% off
      US$547 US$219
    • BOS 7:00 AM
      6h 38m
      Nonstop
      SEA 10:38 AM
      Boston - Seattle | Sun, Jan 3 | Alaska Airlines
      US$220
      60% off
      US$547 US$220
    • BOS 6:28 PM
      6h 28m
      Nonstop
      SEA 9:56 PM
      Boston - Seattle | Fri, Jan 8 | Alaska Airlines
      US$220
      60% off
      US$547 US$220
    • BOS 3:45 PM
      6h 21m
      Nonstop
      SEA 7:06 PM
      Boston - Seattle | Fri, Nov 20 | Delta Air Lines
      US$221
      75% off
      US$882 US$221
    • BOS 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      Boston - Seattle | Thu, Oct 29 | Normal Airline
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    • Cheapest nonstop
      BOS 7:13 AM
      6h 26m
      Nonstop
      SEA 10:39 AM
      Boston - Seattle | Sun, Nov 8 | Alaska Airlines
      US$211 US$547
      61% off
      61% off
      US$547 US$211
    • BOS 7:00 AM
      6h 28m
      Nonstop
      SEA 10:28 AM
      Boston - Seattle | Sat, Nov 21 | Alaska Airlines
      US$215 US$547
      61% off
      61% off
      US$547 US$215
    • BOS 6:22 PM
      6h 38m
      Nonstop
      SEA 10:00 PM
      Boston - Seattle | Mon, Dec 7 | Alaska Airlines
      US$219 US$547
      60% off
      60% off
      US$547 US$219
    • BOS 7:00 AM
      6h 38m
      Nonstop
      SEA 10:38 AM
      Boston - Seattle | Sun, Jan 3 | Alaska Airlines
      US$220
      60% off
      US$547 US$220
    • BOS 6:28 PM
      6h 28m
      Nonstop
      SEA 9:56 PM
      Boston - Seattle | Thu, Jan 7 | Alaska Airlines
      US$220
      60% off
      US$547 US$220
    • BOS 6:22 PM
      6h 38m
      Nonstop
      SEA 10:00 PM
      Boston - Seattle | Thu, Dec 3 | Alaska Airlines
      US$222
      59% off
      US$547 US$222
    • BOS 6:22 PM
      6h 38m
      Nonstop
      SEA 10:00 PM
      Boston - Seattle | Wed, Dec 2 | Alaska Airlines
      US$228
      57% off
      US$547 US$228
    • BOS 5:55 PM
      6h 25m
      Nonstop
      SEA 9:20 PM
      Boston - Seattle | Wed, Nov 4 | Delta Air Lines
      US$234
      56% off
      US$547 US$234
    • BOS 6:20 PM
      6h 24m
      Nonstop
      SEA 9:44 PM
      Boston - Seattle | Mon, Nov 9 | Alaska Airlines
      US$235
      56% off
      US$547 US$235
    • BOS 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      Boston - Seattle | Thu, Oct 29 | Normal Airline
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    • Cheapest nonstop
      BOS 11:15 AM
      6h 20m
      Nonstop
      SEA 2:35 PM
      Boston - Seattle | Sat, Oct 31 | Delta Air Lines
      US$226 US$630
      64% off
      64% off
      US$630 US$226
    • BOS 4:58 PM
      6h 19m
      Nonstop
      SEA 8:17 PM
      Boston - Seattle | Sat, Oct 31 | Alaska Airlines
      US$228 US$630
      64% off
      64% off
      US$630 US$228
    • BOS 7:13 AM
      6h 26m
      Nonstop
      SEA 10:39 AM
      Boston - Seattle | Sun, Nov 1 | Alaska Airlines
      US$261 US$630
      59% off
      59% off
      US$630 US$261
    • BOS 7:55 AM
      6h 25m
      Nonstop
      SEA 11:20 AM
      Boston - Seattle | Mon, Nov 2 | Delta Air Lines
      US$276
      56% off
      US$630 US$276
    • BOS 7:55 AM
      6h 25m
      Nonstop
      SEA 11:20 AM
      Boston - Seattle | Sun, Nov 1 | Delta Air Lines
      US$294
      53% off
      US$630 US$294
    • BOS 4:58 PM
      6h 19m
      Nonstop
      SEA 8:17 PM
      Boston - Seattle | Thu, Oct 29 | Alaska Airlines
      US$302
      52% off
      US$630 US$302
    • BOS 4:58 PM
      6h 19m
      Nonstop
      SEA 8:17 PM
      Boston - Seattle | Wed, Oct 28 | Alaska Airlines
      US$302
      52% off
      US$630 US$302
    • BOS 9:03 AM
      6h 24m
      Nonstop
      SEA 12:27 PM
      Boston - Seattle | Tue, Nov 3 | Alaska Airlines
      US$403
      36% off
      US$630 US$403
    • BOS 4:58 PM
      6h 19m
      Nonstop
      SEA 8:17 PM
      Boston - Seattle | Fri, Oct 30 | Alaska Airlines
      US$421
      33% off
      US$630 US$421
    • BOS 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      Boston - Seattle | Thu, Oct 29 | Normal Airline
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    • BOS 9:03 AM
      6h 17m
      Nonstop
      SEA 12:20 PM
      Boston - Seattle | Sat, Oct 31 | Alaska Airlines
      US$228 US$882
      74% off
      74% off
      US$882 US$228
    • BOS 3:47 PM
      6h 18m
      Nonstop
      SEA 7:05 PM
      Boston - Seattle | Sun, Nov 8 | Delta Air Lines
      US$348 US$882
      61% off
      61% off
      US$882 US$348
    • BOS 3:45 PM
      6h 21m
      Nonstop
      SEA 7:06 PM
      Boston - Seattle | Mon, Nov 16 | Delta Air Lines
      US$184 US$882
      79% off
      79% off
      US$882 US$184
    • BOS 3:45 PM
      6h 21m
      Nonstop
      SEA 7:06 PM
      Boston - Seattle | Fri, Nov 20 | Delta Air Lines
      US$221
      75% off
      US$882 US$221
    • BOS 3:45 PM
      6h 21m
      Nonstop
      SEA 7:06 PM
      Boston - Seattle | Tue, Nov 17 | Delta Air Lines
      US$229
      74% off
      US$882 US$229
    • BOS 3:45 PM
      6h 21m
      Nonstop
      SEA 7:06 PM
      Boston - Seattle | Wed, Nov 11 | Delta Air Lines
      US$230
      74% off
      US$882 US$230
    • BOS 3:45 PM
      6h 21m
      Nonstop
      SEA 7:06 PM
      Boston - Seattle | Thu, Nov 12 | Delta Air Lines
      US$236
      73% off
      US$882 US$236
    • BOS 3:45 PM
      6h 21m
      Nonstop
      SEA 7:06 PM
      Boston - Seattle | Tue, Nov 10 | Delta Air Lines
      US$240
      73% off
      US$882 US$240
    • BOS 3:45 PM
      6h 21m
      Nonstop
      SEA 7:06 PM
      Boston - Seattle | Fri, Nov 13 | Delta Air Lines
      US$247
      72% off
      US$882 US$247
    • BOS 1:00 PM
      17h 25m
      1 stop
      SEA 2:00 PM
      Boston - Seattle | Thu, Oct 29 | Normal Airline
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Displayed flight fares from Boston to Seattle are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Trip.com Price Insights: Flights from Boston Logan International Airport to Seattle-Tacoma International Airport

Which month has the lowest one-way flight price from Boston Logan International Airport to Seattle-Tacoma International Airport?

The data is based on the average one-way flight prices on Trip.com for flights from Boston Logan International Airport to Seattle-Tacoma International Airport across different months over the past 12 months.

Based on Trip.com data from the past 12 months, if you’re looking for low one-way flight fares from Boston Logan International Airport to Seattle-Tacoma International Airport, the best time to book is in March, with an average price of US$227. Try to avoid December, when prices are highest, averaging around US$371.

US$371
US$299
US$227
US$155
    Cheapest
  • US$261
    Oct
  • US$275
    Nov
  • US$371
    Dec
  • US$318
    Jan
  • US$305
    Feb
  • US$227
    Mar
  • US$279
    Apr
  • US$252
    May
  • US$286
    Jun
  • US$284
    Jul
  • US$309
    Aug
  • US$277
    Sep

What is the cheapest day of the week to fly from Boston Logan International Airport to Seattle-Tacoma International Airport?

The data is based on the average flight prices on Trip.com from Boston Logan International Airport to Seattle-Tacoma International Airport across different days of the week over the past 12 months.

Based on Trip.com data from the past 12 months, the cheapest day to depart from Boston Logan International Airport to Seattle-Tacoma International Airport is usually Wednesday, with average fares typically lower than other days. Try to avoid departing on Sunday, as prices are usually the highest on that day.

US$319
US$276
US$233
US$190
    Cheapest
  • US$284
    Mon
  • US$254
    Tue
  • US$233
    Wed
  • US$302
    Thu
  • US$303
    Fri
  • US$286
    Sat
  • US$319
    Sun

Which airline offers the cheapest flights from Boston Logan International Airport to Seattle-Tacoma International Airport?

The cheapest airline flying from Boston Logan International Airport to Seattle-Tacoma International Airport is United Airlines (from US$167) among 6 carriers operating this route. Based on Trip.com's latest 7-day flight data.

United Airlines
From US$167
Alaska Airlines
From US$167
American Airlines
From US$179
Delta Air Lines
From US$182
Hahn Air
From US$210
Sun Country Airlines
From US$228

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What is the flight schedule from Boston Logan International Airport to Seattle-Tacoma International Airport?

Check the schedule for flights from Boston to Seattle and find the flight that best matches your travel plans.

Flight info.
Departure
Arrival
Weekly Schedule

  1. DL332

    Boston Logan International Airport

    9:40 PM

    BOS

    5h 58m

    12:38 AM

    SEA

    S M T W T F S
    Search

  2. AS257

    Boston Logan International Airport

    5:44 PM

    BOS

    6h 24m

    9:08 PM

    SEA

    S - - - - - S
    Search

  3. AS459

    Boston Logan International Airport

    7:00 AM

    BOS

    6h 38m

    10:38 AM

    SEA

    S M T W T F S
    Search

  4. DL384

    Boston Logan International Airport

    7:35 AM

    BOS

    6h 29m

    11:04 AM

    SEA

    S M T W T F S
    Search

  5. DL1103

    Boston Logan International Airport

    11:29 AM

    BOS

    3h 26m

    Nonstop

    1:55 PM

    MSP

    S M T W T F S
    Search

  6. DL877

    Minneapolis-Saint Paul International Airport

    2:59 PM

    MSP

    3h 47m

    Nonstop

    4:46 PM

    SEA

    S M T W T F S

  7. AA690

    Boston Logan International Airport

    6:00 AM

    BOS

    1h 37m

    Nonstop

    7:37 AM

    PHL

    S - - - - - S
    Search

  8. AA2203

    Philadelphia International Airport

    8:10 AM

    PHL

    6h 35m

    Nonstop

    11:45 AM

    SEA

    S - - - - - S

  9. AS358

    Boston Logan International Airport

    4:46 PM

    BOS

    6h 41m

    Nonstop

    8:27 PM

    PDX

    S - - - - - S
    Search

  10. AS1432

    Portland International Airport

    9:59 PM

    PDX

    1h 1m

    Nonstop

    11:00 PM

    SEA

    S - - - - - S

  11. AA1776

    Boston Logan International Airport

    3:06 PM

    BOS

    1h 36m

    Nonstop

    4:42 PM

    PHL

    - - - W T F -
    Search

  12. AA2500

    Philadelphia International Airport

    6:42 PM

    PHL

    6h 29m

    Nonstop

    10:11 PM

    SEA

    S - - - - - S

  13. AA547

    Boston Logan International Airport

    1:25 PM

    BOS

    3h 4m

    Nonstop

    3:29 PM

    ORD

    - M T W T F -
    Search

  14. AA3105

    O'Hare International Airport

    7:17 AM

    ORD

    4h 52m

    Nonstop

    10:09 AM

    SEA

    - M T W T F -

  15. AA4629

    Boston Logan International Airport

    11:17 AM

    BOS

    1h 44m

    Nonstop

    1:01 PM

    PHL

    S - - - - - S
    Search

  16. AA2500

    Philadelphia International Airport

    6:42 PM

    PHL

    6h 29m

    Nonstop

    10:11 PM

    SEA

    S - - - - - S
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About Boston Logan International Airport and Seattle-Tacoma International Airport

Learn about Boston Logan International Airport (BOS) and Seattle-Tacoma International Airport (SEA) — including location, terminals, transportation, and travel tips.

Flight distance 4,008.36 km
Cheapest one-way ticket price US$167
Cheapest return ticket price US$322

FAQs for Boston Logan International Airport to Seattle-Tacoma International Airport Flights

  • How long is the flight from Boston Logan International Airport to Seattle-Tacoma International Airport?

    Boston Logan International Airport to Seattle-Tacoma International Airport takes about 5 hours 55 minutes on average. Actual flight time may vary depending on route, weather and air traffic.
  • There are around 7 daily flights from Boston Logan International Airport (BOS) to Seattle-Tacoma International Airport (SEA).
  • The earliest flight from Boston Logan International Airport to Seattle-Tacoma International Airport departs at 07:03, and the last departs at 23:20, with about 10 flights per day. Flight times may change, so please check the latest departure and arrival times before you travel.
  • The route from Boston Logan International Airport (BOS) to Seattle-Tacoma International Airport (SEA) is quite popular. Without considering departure times or holidays, tickets cost around US$358 in November, the most expensive month to book this route.
    • The distance from Seattle-Tacoma International Airport to downtown is about 17 km. It takes about 30 minutes by taxi.
  • United Airlines is a very popular airline operating an average of 2444 flights per month.
  • One-way flights from Boston Logan International Airport to Seattle-Tacoma International Airport currently start from US$167, and round-trip fares start from US$322. The current lowest fare is a United Airlines flight departing on Wed, Dec 9; prices may vary depending on availability.
  • Yes. Alaska Airlines, Delta Air Lines, Jetblue Airways and United Airlines operate direct flights from Boston Logan International Airport to Seattle-Tacoma International Airport, with an average flight time of 6 hours 39 minutes, and around 69 weekly flights. Actual flight frequency may vary by season.
  • Based on Trip.com flight data for departures within the next 30 days with at most one stop, the average one-way price from Boston Logan International Airport to Seattle-Tacoma International Airport is US$271. Prices may vary depending on the departure date, airline, and availability.
  • Condor and Jetblue Airways are the most popular budget airlines flying from Boston Logan International Airport to Seattle-Tacoma International Airport, with one-way fares starting from US$167. Compare final prices carefully, as baggage, seat selection and payment fees may apply.
  • Boston Logan International Airport to Seattle-Tacoma International Airport operates around 68 weekly flights, mainly by Alaska Airlines, Delta Air Lines and Jetblue Airways. Actual frequency may vary during holidays and seasonal schedule adjustments.
  • Enter Boston Logan International Airport and Seattle-Tacoma International Airport, select your departure date and number of passengers, then compare flights by price, flight duration, and baggage allowance. Once you've chosen a fare, review the change and refund rules, fill in passenger details, and pay to receive your booking confirmation.

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Note: Prices shown on this page are the lowest estimated prices found in the last 24 hours and include all taxes and fees.

Book with no extra fees

Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are clearly shown before payment. Charges for checked baggage, onboard meals, Wi-Fi, and other optional services may also appear in the flight cards where applicable.

Real-time pricing updates

Prices, availability, and travel information on this page have been updated within the last 24 hours, and for many routes the data may refresh in real time. The more popular the route, the more accurate and up-to-date the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
Cancellation/change due to a flight schedule change:
If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.