$154+ Cheap flights from Boston to Seattle (BOS - SEA)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SEA
Mar 10 — Mar 171
1 adult, Economy
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Find cheap flights from Boston to Seattle with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Boston Logan Intl to Seattle/Tacoma Intl are usually found in March or September, booked 35 days in advance, depart on a Wednesday or Thursday and return on a Wednesday
Cheap flight deals from Boston to Seattle
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Best
Last-minute
One-way
Cheapest flights from Boston to SeattleExplore the most affordable flight options available from Boston to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 8, 2026.
Explore the most affordable flight options available from Boston to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 8, 2026.
This Delta deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:57 pm
BOS
- SEA
Nonstop6h 28m
Delta
Wed 3/187:15 am
SEA
- BOS
1 stop19h 17m
Delta
Deal found 2/5![Delta logo]()
$271
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/67:15 am
BOS
- SEA
Nonstop6h 30m
Delta
Tue 3/177:20 am
SEA
- BOS
Nonstop5h 23m
Delta
Deal found 2/6![Delta logo]()
$272
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/266:00 am
BOS
- SEA
1 stop8h 49m
United Airlines
Mon 3/211:59 pm
SEA
- BOS
1 stop9h 47m
United Airlines
Deal found 2/5![United Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/277:30 am
BOS
- SEA
1 stop16h 00m
Delta
Tue 3/1010:25 pm
SEA
- BOS
Nonstop5h 24m
Delta
Deal found 2/6![Delta logo]()
$281
This Alaska Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:32 pm
BOS
- SEA
Nonstop6h 26m
Alaska Airlines
Mon 8/314:59 pm
SEA
- BOS
1 stop11h 32m
Alaska Airlines
Deal found 2/7![Alaska Airlines logo]()
$282
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/84:50 pm
BOS
- SEA
1 stop9h 06m
United Airlines
Sun 4/1211:59 pm
SEA
- BOS
1 stop8h 02m
United Airlines
Deal found 2/4![United Airlines logo]()
$283
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/283:09 pm
BOS
- SEA
1 stop9h 03m
United Airlines
Sat 3/78:00 am
SEA
- BOS
1 stop8h 08m
United Airlines
Deal found 2/7![United Airlines logo]()
$284
This American Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/276:40 pm
BOS
- SEA
1 stop8h 50m
American Airlines
Sat 5/27:00 am
SEA
- BOS
1 stop11h 12m
American Airlines
Deal found 2/8![American Airlines logo]()
$285
This Cheapflightsfares deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/277:00 am
BOS
- SEA
Nonstop6h 20m
JetBlue
Wed 6/311:59 pm
SEA
- BOS
1 stop11h 21m
JetBlue
Deal found 2/5![JetBlue logo]()
$286
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/24:15 pm
BOS
- SEA
1 stop10h 36m
United Airlines
Sat 3/78:00 am
SEA
- BOS
1 stop8h 08m
United Airlines
Deal found 2/4![United Airlines logo]()
$288
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/283:09 pm
BOS
- SEA
1 stop9h 03m
United Airlines
Tue 3/35:00 am
SEA
- BOS
2 stops9h 19m
United Airlines
Deal found 2/7![United Airlines logo]()
$289
Best flights from Boston to SeattleDiscover carefully curated flight deals from Boston to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 8, 2026.
Discover carefully curated flight deals from Boston to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 8, 2026.
This Delta deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/83:55 pm
BOS
- SEA
Nonstop6h 10m
Delta
Tue 5/1211:00 pm
SEA
- BOS
Nonstop5h 35m
Delta
Deal found 2/6![Delta logo]()
$272
This Alaska Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/147:15 am
BOS
- SEA
Nonstop6h 25m
Alaska Airlines
Tue 4/213:38 pm
SEA
- BOS
Nonstop5h 21m
Alaska Airlines
Deal found 2/5![Alaska Airlines logo]()
$272
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/86:34 pm
BOS
- SEA
1 stop8h 23m
United Airlines
Mon 5/1111:48 pm
SEA
- BOS
1 stop8h 13m
United Airlines
Deal found 2/4![United Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/2611:15 am
BOS
- SEA
Nonstop6h 20m
Delta
Tue 3/3110:25 pm
SEA
- BOS
Nonstop5h 25m
Delta
Deal found 2/5![Delta logo]()
$272
This Alaska Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/57:15 am
BOS
- SEA
Nonstop6h 25m
Alaska Airlines
Wed 4/89:31 am
SEA
- BOS
1 stop17h 22m
Alaska Airlines
Deal found 2/6![Alaska Airlines logo]()
$282
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/246:33 pm
BOS
- SEA
1 stop8h 46m
United Airlines
Sat 5/22:23 pm
SEA
- BOS
1 stop7h 36m
United Airlines
Deal found 2/4![United Airlines logo]()
$282
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1911:15 am
BOS
- SEA
Nonstop6h 20m
Delta
Tue 3/2410:25 pm
SEA
- BOS
Nonstop5h 25m
Delta
Deal found 2/7![Delta logo]()
$272
This Delta deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/307:37 am
BOS
- SEA
Nonstop6h 18m
Delta
Wed 5/63:40 pm
SEA
- BOS
Nonstop5h 19m
Delta
Deal found 2/5![Delta logo]()
$272
This Delta deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/236:45 pm
BOS
- SEA
Nonstop6h 20m
Delta
Wed 4/293:40 pm
SEA
- BOS
Nonstop5h 19m
Delta
Deal found 2/5![Delta logo]()
$272
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/207:10 am
BOS
- SEA
Nonstop6h 27m
Delta
Wed 3/253:45 pm
SEA
- BOS
Nonstop5h 14m
Delta
Deal found 2/7![Delta logo]()
$272
This Delta deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/67:15 am
BOS
- SEA
Nonstop6h 30m
Delta
Tue 3/103:45 pm
SEA
- BOS
Nonstop5h 14m
Delta
Deal found 2/5![Delta logo]()
$272
This Delta deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:57 pm
BOS
- SEA
Nonstop6h 28m
Delta
Sat 3/79:20 pm
SEA
- BOS
Nonstop5h 28m
Delta
Deal found 2/5![Delta logo]()
$272
Last-minute flights from Boston to SeattleDiscover last-minute flight deals from Boston to Seattle. Data last updated February 8, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to Seattle. Data last updated February 8, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/173:09 pm
BOS
- SEA
1 stop9h 03m
United Airlines
Tue 3/311:59 pm
SEA
- BOS
1 stop7h 51m
United Airlines
Deal found 2/5![United Airlines logo]()
$337
This United Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/1712:35 pm
BOS
- SEA
1 stop9h 28m
United Airlines
Mon 3/912:36 pm
SEA
- BOS
1 stop9h 13m
United Airlines
Deal found 2/6![United Airlines logo]()
$367
This Southwest deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/179:10 am
BOS
- SEA
2 stops12h 20m
Southwest
Tue 3/39:55 am
SEA
- BOS
1 stop9h 35m
Southwest
Deal found 2/5![Southwest logo]()
$377
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/174:15 pm
BOS
- SEA
1 stop10h 36m
United Airlines
Mon 2/2311:59 pm
SEA
- BOS
1 stop7h 51m
United Airlines
Deal found 2/5![United Airlines logo]()
$382
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1812:35 pm
BOS
- SEA
1 stop9h 28m
United Airlines
Mon 2/2311:35 pm
SEA
- BOS
1 stop8h 10m
United Airlines
Deal found 2/4![United Airlines logo]()
$327
This United Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/182:20 pm
BOS
- SEA
1 stop9h 36m
United Airlines
Wed 3/48:17 am
SEA
- BOS
1 stop7h 51m
United Airlines
Deal found 2/6![United Airlines logo]()
$347
This United Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/187:00 am
BOS
- SEA
1 stop9h 49m
United Airlines
Fri 2/207:15 am
SEA
- BOS
1 stop9h 41m
United Airlines
Deal found 2/6![United Airlines logo]()
$397
This American Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/184:48 pm
BOS
- SEA
1 stop9h 16m
American Airlines
Thu 2/1912:07 am
SEA
- BOS
1 stop8h 21m
American Airlines
Deal found 2/6![American Airlines logo]()
$407
This Southwest deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/182:40 pm
BOS
- SEA
2 stops10h 50m
Southwest
Wed 3/46:05 am
SEA
- BOS
2 stops11h 45m
Southwest
Deal found 2/6![Southwest logo]()
$412
One-way flights from Boston to SeattleSearch for one-way flight options from Boston to Seattle. Find affordable one-way fares based on user searches. Data last updated February 8, 2026.
Search for one-way flight options from Boston to Seattle. Find affordable one-way fares based on user searches. Data last updated February 8, 2026.
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/56:57 pm
BOS
- SEA
Nonstop6h 28m
Delta
Deal found 2/7![Delta logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/255:50 pm
BOS
- SEA
2 stops44h 05m
Multiple Airlines
Deal found 2/6![Multiple Airlines logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:00 am
BOS
- SEA
2 stops33h 01m
Frontier
Deal found 2/6![Frontier logo]()
$157
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:35 pm
BOS
- SEA
2 stops23h 52m
Frontier
Deal found 2/7![Frontier logo]()
$158
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:55 am
BOS
- SEA
1 stop11h 19m
United Airlines
Deal found 2/5![United Airlines logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/75:45 am
BOS
- SEA
2 stops37h 59m
Multiple Airlines
Deal found 2/5![Multiple Airlines logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/612:55 pm
BOS
- SEA
2 stops29h 10m
Frontier
Deal found 2/4![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/512:47 pm
BOS
- SEA
2 stops25h 50m
Frontier
Deal found 2/5![Frontier logo]()
$163
This American Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:00 am
BOS
- SEA
1 stop8h 34m
American Airlines
Deal found 2/7![American Airlines logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/912:35 pm
BOS
- SEA
2 stops31h 34m
Frontier
Deal found 2/7![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/711:16 am
BOS
- SEA
2 stops30h 49m
Frontier
Deal found 2/8![Frontier logo]()
$167
This United Airlines deal was found by Cheapflights users on 2/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/32:20 pm
BOS
- SEA
1 stop9h 36m
United Airlines
Deal found 2/5![United Airlines logo]()
$169
Find flight deals from Boston to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $271 (Delta) |
One-way from | $154 (Delta) |
Popular in | December |
Cheapest in | March |
Average price | $330 |
Good round-trip deal | $339 or less |
Good one-way deal | $197 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Boston to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 8, 2026.
Use the filters below to find and compare flights from Boston to Seattle that are best for you.
Fly from
Boston
Fly to
Seattle
Route
Depart
Return
Price
BostonSeattle
BOS - SEA
BOSSEA
Boston Logan Intl
Fri 5/8
3:55 pm-7:05 pm
Nonstop6h 10m
Seattle/Tacoma Intl
Tue 5/12
11:00 pm-7:35 am
Nonstop5h 35m
$272
BostonSeattle
BOS - SEA
BOSSEA
Boston Logan Intl
Tue 4/14
7:15 am-10:40 am
Nonstop6h 25m
Seattle/Tacoma Intl
Tue 4/21
3:38 pm-11:59 pm
Nonstop5h 21m
$272
BostonSeattle
BOS - SEA
BOSSEA
Boston Logan Intl
Thu 3/26
11:15 am-2:35 pm
Nonstop6h 20m
Seattle/Tacoma Intl
Tue 3/31
10:25 pm-6:50 am
Nonstop5h 25m
$272
BostonSeattle
BOS - SEA
BOSSEA
Boston Logan Intl
Thu 3/19
11:15 am-2:35 pm
Nonstop6h 20m
Seattle/Tacoma Intl
Tue 3/24
10:25 pm-6:50 am
Nonstop5h 25m
$272
BostonSeattle
BOS - SEA
BOSSEA
Boston Logan Intl
Thu 4/30
7:37 am-10:55 am
Nonstop6h 18m
Seattle/Tacoma Intl
Wed 5/6
3:40 pm-11:59 pm
Nonstop5h 19m
$272
BostonSeattle
BOS - SEA
BOSSEA
Boston Logan Intl
Thu 4/23
6:45 pm-10:05 pm
Nonstop6h 20m
Seattle/Tacoma Intl
Wed 4/29
3:40 pm-11:59 pm
Nonstop5h 19m
$272
BostonSeattle
BOS - SEA
BOSSEA
Boston Logan Intl
Fri 3/20
7:10 am-10:37 am
Nonstop6h 27m
Seattle/Tacoma Intl
Wed 3/25
3:45 pm-11:59 pm
Nonstop5h 14m
$272
BostonSeattle
BOS - SEA
BOSSEA
Boston Logan Intl
Fri 3/6
7:15 am-10:45 am
Nonstop6h 30m
Seattle/Tacoma Intl
Tue 3/10
3:45 pm-11:59 pm
Nonstop5h 14m
$272
BostonSeattle
BOS - SEA
BOSSEA
Boston Logan Intl
Fri 2/27
6:57 pm-10:25 pm
Nonstop6h 28m
Seattle/Tacoma Intl
Sat 3/7
9:20 pm-5:48 am
Nonstop5h 28m
$272
BostonSeattle
BOS - SEA
BOSSEA
Boston Logan Intl
Fri 5/8
6:34 pm-11:57 pm
1 stop8h 23m
Seattle/Tacoma Intl
Mon 5/11
11:48 pm-11:01 am
1 stop8h 13m
$277
Showing 1-10 of 19 results
Compare providers for flights from Boston to Seattle
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Seattle in February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Boston-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Boston-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Boston to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Boston with our price prediction graph.
BOS-SEA
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Boston to Seattle
Prices
Airlines
Delays
How far ahead should I book a flight from Boston to Seattle?
Use this chart to determine the optimal time to book a round-trip flight from Boston to Seattle. Price data was last updated on January 30, 2026.
The price you pay for your flight from Boston to Seattle may vary depending on when you book. For the best chance of a lower fare, look to book 35 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Boston to Seattle?
Currently, March is the cheapest month in which you can book a flight from Boston to Seattle (average of $118). Flying from Boston to Seattle in December is currently the most expensive (average of $228). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from BOS to SEA?
Find hourly flight availability from Boston to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 8, 2026.
When flying from Boston to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
How often are flights from Boston to Seattle delayed?
About 14% of weekly flights between Boston and Seattle have experienced delays in the past year, with the average delay time being 164 minutes.
What is the most punctual flight time for Boston to Seattle flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Wednesday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Boston to Seattle flights?
Over the last year, Delta have had the lowest number of delays on this route, with just 12% of flights being delayed.
The best insider tips for Boston to Seattle flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Boston to Seattle trip
Our travel experts
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated February 8, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines from Boston to Seattle to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.8
Overall
8.0
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Comfort
7.8
Overall
8.0
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Comfort
7.8
Overall
8.0
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Comfort
7.8
Overall
8.0
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Comfort
7.8
Overall
8.0
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Comfort
7.8
Overall
8.0
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Related info for your journey
Find useful and relevant information for your journey from Boston to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsTacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Lynnwood
Edmonds
Lacey
Renton
Puyallup
Kirkland
Kent
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis
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Complete your trip
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Boston and Seattle flights
Browse other Boston and Seattle flight options. Last updated on February 8, 2026.
Other flights from Boston
Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on February 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Seattle
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on February 8, 2026.
Top 8 airlines flying from Boston to Seattle
Discover the top 8 airlines that operate flights from Boston to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$123 | Average$329 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$125 | Average$315 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$149 | Average$366 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$172 | Average$318 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$232 | Average$383 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$234 | Average$414 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$252 | Average$459 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$256 | Average$379 | FlexibilityNo cancel fee | On-time63% |