$134+ Cheap flights from Seattle to Boston (SEA - BOS)
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 5/17. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
Mar 25 — Apr 11
1 adult, Economy
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Find cheap flights from Seattle to Boston 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 Seattle/Tacoma Intl to Boston Logan Intl are usually found in March or September, booked 70 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday
Cheap flight deals from Seattle to Boston
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Cheapest flights from Seattle to BostonExplore the most affordable flight options available from Seattle to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 23, 2026.
Explore the most affordable flight options available from Seattle to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 23, 2026.
This Alaska Airlines deal was found by Cheapflights users on 2/22. 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.
Wed 3/183:38 pm
SEA
- BOS
Nonstop5h 21m
Alaska Airlines
Thu 3/267:15 am
BOS
- SEA
Nonstop6h 25m
Alaska Airlines
Deal found 2/22![Alaska Airlines logo]()
$247
This Cheapflightsfares deal was found by Cheapflights users on 2/20. 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.
Thu 5/1411:30 am
SEA
- BOS
Nonstop5h 35m
JetBlue
Tue 5/267:00 am
BOS
- SEA
Nonstop6h 20m
JetBlue
Deal found 2/20![JetBlue logo]()
$251
This Delta deal was found by Cheapflights users on 2/19. 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.
Wed 5/2011:00 pm
SEA
- BOS
Nonstop5h 35m
Delta
Mon 6/17:30 pm
BOS
- SEA
Nonstop6h 07m
Delta
Deal found 2/19![Delta logo]()
$252
This Cheapflightsfares deal was found by Cheapflights users on 2/19. 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.
Thu 5/1411:30 am
SEA
- BOS
Nonstop5h 35m
JetBlue
Tue 5/197:00 am
BOS
- SEA
Nonstop6h 20m
JetBlue
Deal found 2/19![JetBlue logo]()
$256
This United Airlines deal was found by Cheapflights users on 2/22. 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 5/2011:00 pm
SEA
- BOS
1 stop7h 53m
United Airlines
Wed 5/276:35 pm
BOS
- SEA
1 stop8h 24m
United Airlines
Deal found 2/22![United Airlines logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 2/20. 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 5/199:34 am
SEA
- BOS
Nonstop5h 37m
Alaska Airlines
Sat 5/236:40 pm
BOS
- SEA
1 stop17h 45m
Alaska Airlines
Deal found 2/20![Alaska Airlines logo]()
$262
This Delta deal was found by Cheapflights users on 2/20. 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 5/144:05 pm
SEA
- BOS
Nonstop5h 32m
Delta
Fri 5/157:30 pm
BOS
- SEA
Nonstop6h 09m
Delta
Deal found 2/20![Delta logo]()
$267
This United Airlines deal was found by Cheapflights users on 2/22. 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 4/3011:48 pm
SEA
- BOS
1 stop8h 13m
United Airlines
Mon 5/46:39 pm
BOS
- SEA
1 stop8h 20m
United Airlines
Deal found 2/22![United Airlines logo]()
$269
This Delta deal was found by Cheapflights users on 2/19. 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.
Wed 6/311:00 pm
SEA
- BOS
Nonstop5h 33m
Delta
Mon 6/86:35 pm
BOS
- SEA
Nonstop6h 30m
Delta
Deal found 2/19![Delta logo]()
$272
This Delta deal was found by Cheapflights users on 2/20. 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.
Wed 3/253:45 pm
SEA
- BOS
Nonstop5h 14m
Delta
Wed 4/227:56 pm
BOS
- SEA
1 stop15h 54m
Delta
Deal found 2/20![Delta logo]()
$275
This Delta deal was found by Cheapflights users on 2/20. 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 5/1411:45 am
SEA
- BOS
1 stop8h 06m
Delta
Tue 5/197:45 am
BOS
- SEA
Nonstop6h 07m
Delta
Deal found 2/20![Delta logo]()
$277
Best flights from Seattle to BostonDiscover carefully curated flight deals from Seattle to Boston that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 23, 2026.
Discover carefully curated flight deals from Seattle to Boston that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 23, 2026.
This Delta deal was found by Cheapflights users on 2/19. 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.
Mon 3/2310:25 pm
SEA
- BOS
Nonstop5h 25m
Delta
Thu 3/266:45 pm
BOS
- SEA
Nonstop6h 25m
Delta
Deal found 2/19![Delta logo]()
$267
This Alaska Airlines deal was found by Cheapflights users on 2/22. 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.
Sat 5/233:30 pm
SEA
- BOS
Nonstop5h 29m
Alaska Airlines
Sun 5/246:00 am
BOS
- SEA
1 stop10h 14m
Alaska Airlines
Deal found 2/22![Alaska Airlines logo]()
$282
This Delta deal was found by Cheapflights users on 2/19. 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 3/123:45 pm
SEA
- BOS
Nonstop5h 14m
Delta
Mon 3/167:10 am
BOS
- SEA
Nonstop6h 27m
Delta
Deal found 2/19![Delta logo]()
$267
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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 3/1010:40 pm
SEA
- BOS
Nonstop5h 14m
Alaska Airlines
Mon 3/166:24 pm
BOS
- SEA
Nonstop6h 36m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$297
This Delta deal was found by Cheapflights users on 2/19. 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 6/411:00 pm
SEA
- BOS
Nonstop5h 33m
Delta
Tue 6/96:35 pm
BOS
- SEA
Nonstop6h 30m
Delta
Deal found 2/19![Delta logo]()
$272
This Delta deal was found by Cheapflights users on 2/19. 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.
Wed 4/153:40 pm
SEA
- BOS
Nonstop5h 19m
Delta
Wed 4/227:56 pm
BOS
- SEA
1 stop15h 54m
Delta
Deal found 2/19![Delta logo]()
$275
This Delta deal was found by Cheapflights users on 2/22. 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.
Mon 5/1111:45 am
SEA
- BOS
1 stop8h 06m
Delta
Sat 5/167:48 am
BOS
- SEA
Nonstop6h 07m
Delta
Deal found 2/22![Delta logo]()
$277
This Delta deal was found by Cheapflights users on 2/19. 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 5/1611:00 pm
SEA
- BOS
Nonstop5h 35m
Delta
Sat 5/237:45 am
BOS
- SEA
Nonstop6h 07m
Delta
Deal found 2/19![Delta logo]()
$277
This Delta deal was found by Cheapflights users on 2/19. 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.
Wed 3/113:45 pm
SEA
- BOS
Nonstop5h 14m
Delta
Wed 3/187:10 am
BOS
- SEA
Nonstop6h 27m
Delta
Deal found 2/19![Delta logo]()
$297
This Delta deal was found by Cheapflights users on 2/21. 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 3/1310:25 pm
SEA
- BOS
Nonstop5h 24m
Delta
Wed 3/186:15 am
BOS
- SEA
1 stop11h 39m
Delta
Deal found 2/21![Delta logo]()
$307
This Delta deal was found by Cheapflights users on 2/19. 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.
Mon 6/111:00 pm
SEA
- BOS
Nonstop5h 33m
Delta
Fri 6/53:55 pm
BOS
- SEA
Nonstop6h 08m
Delta
Deal found 2/19![Delta logo]()
$307
This Delta deal was found by Cheapflights users on 2/20. 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 3/203:45 pm
SEA
- BOS
Nonstop5h 14m
Delta
Wed 3/256:44 pm
BOS
- SEA
1 stop8h 19m
Delta
Deal found 2/20![Delta logo]()
$317
Last-minute flights from Seattle to BostonDiscover last-minute flight deals from Seattle to Boston. Data last updated February 23, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Boston. Data last updated February 23, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Tue 3/105:30 am
SEA
- BOS
1 stop8h 44m
American Airlines
Tue 3/171:10 pm
BOS
- SEA
1 stop11h 47m
American Airlines
Deal found 2/20![American Airlines logo]()
$302
This Delta deal was found by Cheapflights users on 2/19. 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 3/127:15 am
SEA
- BOS
1 stop11h 07m
Delta
Wed 3/183:10 pm
BOS
- SEA
1 stop21h 49m
Delta
Deal found 2/19![Delta logo]()
$285
This American Airlines deal was found by Cheapflights users on 2/19. 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 3/126:00 am
SEA
- BOS
1 stop9h 02m
American Airlines
Wed 3/185:31 pm
BOS
- SEA
1 stop9h 53m
American Airlines
Deal found 2/19![American Airlines logo]()
$286
This American Airlines deal was found by Cheapflights users on 2/19. 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.
Tue 3/1712:07 am
SEA
- BOS
1 stop7h 39m
American Airlines
Wed 3/255:31 pm
BOS
- SEA
1 stop9h 53m
American Airlines
Deal found 2/19![American Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 2/22. 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 3/193:45 pm
SEA
- BOS
Nonstop5h 14m
Delta
Wed 3/257:10 am
BOS
- SEA
Nonstop6h 27m
Delta
Deal found 2/22![Delta logo]()
$267
This Alaska Airlines deal was found by Cheapflights users on 2/19. 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.
Thu 3/1910:15 pm
SEA
- BOS
Nonstop5h 24m
Alaska Airlines
Mon 3/236:10 pm
BOS
- SEA
Nonstop6h 24m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 2/20. 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 3/255:30 am
SEA
- BOS
1 stop6h 50m
Southwest
Wed 4/12:00 pm
BOS
- SEA
2 stops13h 20m
Southwest
Deal found 2/20![Southwest logo]()
$262
This Delta deal was found by Cheapflights users on 2/20. 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.
Wed 3/253:45 pm
SEA
- BOS
Nonstop5h 14m
Delta
Wed 4/227:56 pm
BOS
- SEA
1 stop15h 54m
Delta
Deal found 2/20![Delta logo]()
$275
This Delta deal was found by Cheapflights users on 2/20. 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 3/265:30 am
SEA
- BOS
1 stop8h 02m
Delta
Fri 3/276:45 pm
BOS
- SEA
Nonstop6h 25m
Delta
Deal found 2/20![Delta logo]()
$277
This Delta deal was found by Cheapflights users on 2/18. 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 3/265:30 am
SEA
- BOS
1 stop8h 02m
Delta
Wed 4/16:10 am
BOS
- SEA
1 stop11h 17m
Delta
Deal found 2/18![Delta logo]()
$287
This Southwest deal was found by Cheapflights users on 2/18. 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 3/315:30 am
SEA
- BOS
1 stop6h 50m
Southwest
Tue 4/77:20 am
BOS
- SEA
2 stops12h 35m
Southwest
Deal found 2/18![Southwest logo]()
$272
One-way flights from Seattle to BostonSearch for one-way flight options from Seattle to Boston. Find affordable one-way fares based on user searches. Data last updated February 23, 2026.
Search for one-way flight options from Seattle to Boston. Find affordable one-way fares based on user searches. Data last updated February 23, 2026.
This CheapOair deal was found by Cheapflights users on 2/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/178:45 am
SEA
- BOS
1 stop18h 35m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 5/114:20 pm
SEA
- BOS
2 stops16h 45m
Frontier
Deal found 2/19![Frontier logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 4/139:34 pm
SEA
- BOS
2 stops39h 54m
Multiple Airlines
Deal found 2/19![Multiple Airlines logo]()
$138
This Southwest deal was found by Cheapflights users on 2/19. 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 4/2811:45 pm
SEA
- BOS
2 stops9h 30m
Southwest
Deal found 2/19![Southwest logo]()
$139
This Southwest deal was found by Cheapflights users on 2/20. 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 4/296:30 am
SEA
- BOS
2 stops9h 05m
Southwest
Deal found 2/20![Southwest logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 4/217:12 pm
SEA
- BOS
2 stops27h 19m
Frontier
Deal found 2/19![Frontier logo]()
$145
This American Airlines deal was found by Cheapflights users on 2/18. 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 4/210:57 pm
SEA
- BOS
1 stop7h 32m
American Airlines
Deal found 2/18![American Airlines logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 3/3010:10 pm
SEA
- BOS
2 stops24h 03m
Frontier
Deal found 2/19![Frontier logo]()
$150
This United Airlines deal was found by Cheapflights users on 2/18. 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 4/172:22 pm
SEA
- BOS
1 stop7h 37m
United Airlines
Deal found 2/18![United Airlines logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 2/19. 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 3/316:24 pm
SEA
- BOS
2 stops18h 04m
Multiple Airlines
Deal found 2/19![Multiple Airlines logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 2/22. 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 5/76:57 pm
SEA
- BOS
2 stops26h 54m
Frontier
Deal found 2/22![Frontier logo]()
$153
This Delta deal was found by Cheapflights users on 2/20. 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.
Mon 6/111:00 pm
SEA
- BOS
Nonstop5h 33m
Delta
Deal found 2/20![Delta logo]()
$154
Find flight deals from Seattle to Boston
Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Boston (BOS). 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 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $247 (Alaska Airlines) |
One-way from | $134 (CheapOair) |
Popular in | December |
Cheapest in | March |
Average price | $364 |
Good round-trip deal | $312 or less |
Good one-way deal | $209 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Seattle to Boston 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 23, 2026.
Use the filters below to find and compare flights from Seattle to Boston that are best for you.
Fly from
Seattle
Fly to
Boston
Route
Depart
Return
Price
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mon 3/23
10:25 pm-6:50 am
Nonstop5h 25m
Boston Logan Intl
Thu 3/26
6:45 pm-10:10 pm
Nonstop6h 25m
$267
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Thu 3/12
3:45 pm-11:59 pm
Nonstop5h 14m
Boston Logan Intl
Mon 3/16
7:10 am-10:37 am
Nonstop6h 27m
$267
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Thu 6/4
11:00 pm-7:33 am
Nonstop5h 33m
Boston Logan Intl
Tue 6/9
6:35 pm-10:05 pm
Nonstop6h 30m
$272
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Wed 4/15
3:40 pm-11:59 pm
Nonstop5h 19m
Boston Logan Intl
Wed 4/22
7:56 pm-8:50 am
1 stop15h 54m
$275
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mon 5/11
11:45 am-10:51 pm
1 stop8h 06m
Boston Logan Intl
Sat 5/16
7:48 am-10:55 am
Nonstop6h 07m
$277
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Sat 5/16
11:00 pm-7:35 am
Nonstop5h 35m
Boston Logan Intl
Sat 5/23
7:45 am-10:52 am
Nonstop6h 07m
$277
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Sat 5/23
3:30 pm-11:59 pm
Nonstop5h 29m
Boston Logan Intl
Sun 5/24
6:00 am-1:14 pm
1 stop10h 14m
$282
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Tue 3/10
10:40 pm-6:54 am
Nonstop5h 14m
Boston Logan Intl
Mon 3/16
6:24 pm-10:00 pm
Nonstop6h 36m
$297
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Wed 3/11
3:45 pm-11:59 pm
Nonstop5h 14m
Boston Logan Intl
Wed 3/18
7:10 am-10:37 am
Nonstop6h 27m
$297
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Fri 3/13
10:25 pm-6:49 am
Nonstop5h 24m
Boston Logan Intl
Wed 3/18
6:15 am-2:54 pm
1 stop11h 39m
$307
Showing 1-10 of 24 results
Compare providers for flights from Seattle to Boston
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 Seattle to Boston in February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Seattle-Boston flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Boston flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Boston flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Seattle-Boston 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 Seattle-Boston 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 Seattle to Boston
Have a flexible travel schedule? Discover the best time to fly to Boston from Seattle with our price prediction graph.
SEA-BOS
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 Seattle to Boston
Prices
Airlines
Delays
How far ahead should I book a flight from Seattle to Boston?
Use this chart to determine the optimal time to book a round-trip flight from Seattle to Boston. Price data was last updated on February 20, 2026.
Booking 27 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Boston. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from Seattle to Boston?
Currently, March is the cheapest month in which you can book a flight from Seattle to Boston (average of $108). Flying from Seattle to Boston in January is currently the most expensive (average of $257). 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 SEA to BOS?
Find hourly flight availability from Seattle to Boston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 23, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 45% on flights from Seattle to Boston by exploring options for tickets at noon.
What is the cheapest day to fly from Seattle to Boston?
Use this chart to determine the cheapest time to fly round-trip from Seattle to Boston. Price data was last updated on February 21, 2026.
Travelers seeking maximum savings on their Seattle to Boston flight should consider departing on Saturday at noon when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
How often are flights from Seattle to Boston delayed?
About 17% of weekly flights between Seattle and Boston have experienced delays in the past year, with the average delay time being 166 minutes.
What is the most punctual flight time for Seattle to Boston flights?
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Tuesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Seattle to Boston flights?
Over the last year, Delta have had the lowest number of delays on this route, with just 10% of flights being delayed.
The best insider tips for Seattle to Boston 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 Seattle to Boston trip
Our travel experts
Reviews of airlines servicing Boston
Get insights into the airlines that provide service to Boston. 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 Boston. Reviews last updated February 23, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines from Seattle to Boston 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.
Entertainment
7.0
Overall
8.0
Boarding
8.1
Comfort
7.8
Food
7.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Entertainment
7.0
Overall
8.0
Boarding
8.1
Comfort
7.8
Food
7.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Entertainment
7.0
Overall
8.0
Boarding
8.1
Comfort
7.8
Food
7.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Entertainment
7.0
Overall
8.0
Boarding
8.1
Comfort
7.8
Food
7.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Entertainment
7.0
Overall
8.0
Boarding
8.1
Comfort
7.8
Food
7.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Entertainment
7.0
Overall
8.0
Boarding
8.1
Comfort
7.8
Food
7.1
Crew
8.5
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Related info for your journey
Find useful and relevant information for your journey from Seattle to Boston. 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 Boston?
Book flights to Boston if you plan to visit one of these locationsMedford
Cambridge
Hampton Beach
Watertown
Seekonk
Brockton
Concord
Seabrook
Cranston
Lincoln
Smithfield
Warwick
Peabody
York Beach
Londonderry
Swansea
Old Orchard Beach
Quincy
Lowell
Chelsea
Browse thousands of different options on Cheapflights for your next trip
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Other flights to Boston
Explore flights to Boston departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on February 23, 2026.
Complete your trip
Complete your trip to Boston by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Seattle to Boston by cabin class
Find flights from Seattle to Boston, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Seattle and Boston flights
Browse other Seattle and Boston flight options. Last updated on February 23, 2026.
Other flights from Seattle
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on February 23, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 8 airlines flying from Seattle to Boston
Discover the top 8 airlines that operate flights from Seattle to Boston. 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 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$296 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$127 | Average$322 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$147 | Average$380 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$178 | Average$384 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$196 | Average$391 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$223 | Average$457 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$235 | Average$456 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$281 | Average$343 | FlexibilityNo cancel fee | On-time63% |