$149+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
Mai 29 — Jun 51
Round-trip
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 September or October, booked 70 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday
Cheap flight deals from Seattle to Boston
Cheapest
Best
Last-minute
One-way
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 April 29, 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 April 29, 2026.
This SmartFares deal was found by Cheapflights users on 4/25. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 5/169:34 am
SEA
- BOS
Nonstop5h 37m
Alaska Airlines
Sa 5/237:11 pm
BOS
- SEA
Nonstop6h 16m
Alaska Airlines
Deal found 4/25![Alaska Airlines logo]()
$269
This Cheapflightsfares deal was found by Cheapflights users on 4/28. 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.
Mi 6/311:35 am
SEA
- BOS
Nonstop5h 39m
JetBlue
Di 6/97:00 am
BOS
- SEA
Nonstop6h 15m
JetBlue
Deal found 4/28![JetBlue logo]()
$282
This JetBlue deal was found by Cheapflights users on 4/24. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 5/1611:30 am
SEA
- BOS
Nonstop5h 37m
JetBlue
Sa 5/237:00 am
BOS
- SEA
Nonstop6h 17m
JetBlue
Deal found 4/24![JetBlue logo]()
$286
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Mi 9/3010:40 pm
SEA
- BOS
1 stop7h 44m
United Airlines
Sa 10/39:30 am
BOS
- SEA
1 stop9h 10m
United Airlines
Deal found 4/27![United Airlines logo]()
$287
This American Airlines deal was found by Cheapflights users on 4/27. 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.
Mi 6/106:00 am
SEA
- BOS
1 stop9h 50m
American Airlines
Di 6/169:01 am
BOS
- SEA
1 stop10h 43m
American Airlines
Deal found 4/27![American Airlines logo]()
$288
This American Airlines deal was found by Cheapflights users on 4/28. 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.
Di 5/2610:35 pm
SEA
- BOS
1 stop7h 06m
American Airlines
Di 6/23:06 pm
BOS
- SEA
1 stop10h 52m
American Airlines
Deal found 4/28![American Airlines logo]()
$290
This Cheapflightsfares deal was found by Cheapflights users on 4/28. 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.
Di 9/1511:55 pm
SEA
- BOS
Nonstop5h 24m
JetBlue
Di 9/226:59 pm
BOS
- SEA
Nonstop6h 39m
JetBlue
Deal found 4/28![JetBlue logo]()
$292
This Delta deal was found by Cheapflights users on 4/28. 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.
Mi 5/204:10 pm
SEA
- BOS
Nonstop5h 30m
Delta
Di 5/267:30 pm
BOS
- SEA
Nonstop6h 10m
Delta
Deal found 4/28![Delta logo]()
$297
This Delta deal was found by Cheapflights users on 4/27. 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.
Sa 5/307:15 am
SEA
- BOS
Nonstop5h 40m
Delta
Sa 6/67:48 am
BOS
- SEA
Nonstop6h 05m
Delta
Deal found 4/27![Delta logo]()
$298
This Flighttix deal was found by Cheapflights users on 4/26. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 5/307:55 am
SEA
- BOS
Nonstop5h 37m
Multiple Airlines
Sa 6/67:00 am
BOS
- SEA
Nonstop6h 15m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$301
This CheapOair deal was found by Cheapflights users on 4/28. 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.
Sa 5/233:30 pm
SEA
- BOS
Nonstop5h 29m
Alaska Airlines
Di 6/26:40 pm
BOS
- SEA
1 stop18h 45m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$302
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 April 29, 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 April 29, 2026.
This Delta deal was found by Cheapflights users on 4/28. 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.
Sa 6/612:05 pm
SEA
- BOS
Nonstop5h 38m
Delta
Di 6/97:25 pm
BOS
- SEA
Nonstop6h 24m
Delta
Deal found 4/28![Delta logo]()
$297
This Southwest deal was found by Cheapflights users on 4/28. 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.
Mi 6/36:00 am
SEA
- BOS
2 stops10h 40m
Southwest
Mo 6/86:45 pm
BOS
- SEA
1 stop8h 45m
Southwest
Deal found 4/28![Southwest logo]()
$382
This Alaska Airlines deal was found by Cheapflights users on 4/25. 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.
Mi 10/73:43 pm
SEA
- BOS
Nonstop5h 22m
Alaska Airlines
Fr 10/168:50 am
BOS
- SEA
1 stop10h 57m
Alaska Airlines
Deal found 4/25![Alaska Airlines logo]()
$405
This Southwest deal was found by Cheapflights users on 4/24. 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.
Do 8/611:05 pm
SEA
- BOS
1 stop6h 55m
Southwest
Mo 8/105:25 am
BOS
- SEA
1 stop11h 30m
Southwest
Deal found 4/24![Southwest logo]()
$387
This Delta deal was found by Cheapflights users on 4/25. 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.
Sa 5/911:00 pm
SEA
- BOS
Nonstop5h 35m
Delta
Sa 5/167:48 am
BOS
- SEA
Nonstop6h 07m
Delta
Deal found 4/25![Delta logo]()
$402
This Southwest deal was found by Cheapflights users on 4/28. 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.
Do 9/247:25 pm
SEA
- BOS
2 stops11h 25m
Southwest
Di 9/295:35 am
BOS
- SEA
2 stops10h 45m
Southwest
Deal found 4/28![Southwest logo]()
$387
This Delta deal was found by Cheapflights users on 4/27. 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.
Mo 5/2511:00 pm
SEA
- BOS
Nonstop5h 35m
Delta
Mo 6/17:30 pm
BOS
- SEA
Nonstop6h 10m
Delta
Deal found 4/27![Delta logo]()
$412
This Southwest deal was found by Cheapflights users on 4/28. 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.
Di 7/147:30 pm
SEA
- BOS
2 stops9h 30m
Southwest
Mo 7/207:55 am
BOS
- SEA
2 stops16h 35m
Southwest
Deal found 4/28![Southwest logo]()
$388
This Delta deal was found by Cheapflights users on 4/27. 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.
Mo 6/14:10 pm
SEA
- BOS
Nonstop5h 30m
Delta
Fr 6/56:15 am
BOS
- SEA
1 stop20h 38m
Delta
Deal found 4/27![Delta logo]()
$415
This Southwest deal was found by Cheapflights users on 4/26. 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.
Mi 5/2011:45 pm
SEA
- BOS
1 stop9h 55m
Southwest
Mi 5/272:25 pm
BOS
- SEA
2 stops12h 10m
Southwest
Deal found 4/26![Southwest logo]()
$415
This Southwest deal was found by Cheapflights users on 4/28. 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.
Do 5/285:35 pm
SEA
- BOS
2 stops11h 30m
Southwest
Do 6/46:45 pm
BOS
- SEA
1 stop8h 45m
Southwest
Deal found 4/28![Southwest logo]()
$420
Last-minute flights from Seattle to BostonDiscover last-minute flight deals from Seattle to Boston. Data last updated April 29, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Boston. Data last updated April 29, 2026 and is based on user searches.
This SmartFares deal was found by Cheapflights users on 4/25. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 5/169:34 am
SEA
- BOS
Nonstop5h 37m
Alaska Airlines
Sa 5/237:11 pm
BOS
- SEA
Nonstop6h 16m
Alaska Airlines
Deal found 4/25![Alaska Airlines logo]()
$269
This JetBlue deal was found by Cheapflights users on 4/24. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 5/1611:30 am
SEA
- BOS
Nonstop5h 37m
JetBlue
Sa 5/237:00 am
BOS
- SEA
Nonstop6h 17m
JetBlue
Deal found 4/24![JetBlue logo]()
$286
This Cheapflightsfares deal was found by Cheapflights users on 4/25. 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.
Di 5/1911:30 am
SEA
- BOS
Nonstop5h 37m
JetBlue
Di 6/27:00 am
BOS
- SEA
Nonstop6h 17m
JetBlue
Deal found 4/25![JetBlue logo]()
$282
This Expedia deal was found by Cheapflights users on 4/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 5/203:30 pm
SEA
- BOS
Nonstop5h 29m
Multiple Airlines
Mi 5/277:00 am
BOS
- SEA
Nonstop6h 17m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$292
This Delta deal was found by Cheapflights users on 4/28. 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.
Mi 5/204:10 pm
SEA
- BOS
Nonstop5h 30m
Delta
Di 5/267:30 pm
BOS
- SEA
Nonstop6h 10m
Delta
Deal found 4/28![Delta logo]()
$297
This CheapOair deal was found by Cheapflights users on 4/28. 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.
Sa 5/233:30 pm
SEA
- BOS
Nonstop5h 29m
Alaska Airlines
Di 6/26:40 pm
BOS
- SEA
1 stop18h 45m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$302
This American Airlines deal was found by Cheapflights users on 4/28. 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.
Di 5/2610:35 pm
SEA
- BOS
1 stop7h 06m
American Airlines
Mi 6/36:36 pm
BOS
- SEA
1 stop8h 40m
American Airlines
Deal found 4/28![American Airlines logo]()
$287
This American Airlines deal was found by Cheapflights users on 4/28. 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.
Di 5/2610:35 pm
SEA
- BOS
1 stop7h 06m
American Airlines
Di 6/23:06 pm
BOS
- SEA
1 stop10h 52m
American Airlines
Deal found 4/28![American Airlines logo]()
$290
This Delta deal was found by Cheapflights users on 4/27. 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.
Sa 5/307:15 am
SEA
- BOS
Nonstop5h 40m
Delta
Sa 6/67:48 am
BOS
- SEA
Nonstop6h 05m
Delta
Deal found 4/27![Delta logo]()
$298
This Flighttix deal was found by Cheapflights users on 4/26. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 5/307:55 am
SEA
- BOS
Nonstop5h 37m
Multiple Airlines
Sa 6/67:00 am
BOS
- SEA
Nonstop6h 15m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$301
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 April 29, 2026.
Search for one-way flight options from Seattle to Boston. Find affordable one-way fares based on user searches. Data last updated April 29, 2026.
This Delta deal was found by Cheapflights users on 4/28. 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.
Mi 5/204:10 pm
SEA
- BOS
Nonstop5h 30m
Delta
Deal found 4/28![Delta logo]()
$149
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Mo 6/17:50 pm
SEA
- BOS
2 stops26h 34m
Frontier
Deal found 4/27![Frontier logo]()
$150
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Mo 5/1810:41 pm
SEA
- BOS
1 stop8h 37m
United Airlines
Deal found 4/27![United Airlines logo]()
$154
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Mi 5/1310:53 pm
SEA
- BOS
1 stop7h 32m
United Airlines
Deal found 4/28![United Airlines logo]()
$159
This Cheapflightsfares deal was found by Cheapflights users on 4/28. 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.
So 5/1711:30 am
SEA
- BOS
Nonstop5h 35m
JetBlue
Deal found 4/28![JetBlue logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 4/24. 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.
So 5/107:50 pm
SEA
- BOS
2 stops33h 54m
Frontier
Deal found 4/24![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
So 6/77:50 pm
SEA
- BOS
2 stops33h 02m
Frontier
Deal found 4/27![Frontier logo]()
$170
This American Airlines deal was found by Cheapflights users on 4/27. 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.
Mi 7/89:35 pm
SEA
- BOS
1 stop8h 45m
American Airlines
Deal found 4/27![American Airlines logo]()
$174
This Southwest deal was found by Cheapflights users on 4/25. 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.
Di 7/217:30 pm
SEA
- BOS
2 stops9h 30m
Southwest
Deal found 4/25![Southwest logo]()
$179
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Fr 5/157:50 pm
SEA
- BOS
2 stops26h 34m
Frontier
Deal found 4/27![Frontier logo]()
$181
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 April 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $269 (SmartFares) |
One-way from | $149 (Delta) |
Popular in | December |
Cheapest in | September |
Average price | $442 |
Good round-trip deal | $368 or less |
Good one-way deal | $208 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 April 29, 2026.
Use the filters below to find and compare flights from Seattle to Boston that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Sa 6/6
12:05 pm-8:43 pm
Nonstop5h 38m
Boston Logan Intl
Di 6/9
7:25 pm-10:49 pm
Nonstop6h 24m
$297
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mi 6/3
6:00 am-7:40 pm
2 stops10h 40m
Boston Logan Intl
Mo 6/8
6:45 pm-12:30 am
1 stop8h 45m
$382
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Do 8/6
11:05 pm-9:00 am
1 stop6h 55m
Boston Logan Intl
Mo 8/10
5:25 am-1:55 pm
1 stop11h 30m
$387
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Do 9/24
7:25 pm-9:50 am
2 stops11h 25m
Boston Logan Intl
Di 9/29
5:35 am-1:20 pm
2 stops10h 45m
$387
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Di 7/14
7:30 pm-8:00 am
2 stops9h 30m
Boston Logan Intl
Mo 7/20
7:55 am-9:30 pm
2 stops16h 35m
$388
Quickest round-trip
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Sa 5/9
11:00 pm-7:35 am
Nonstop5h 35m
Boston Logan Intl
Sa 5/16
7:48 am-10:55 am
Nonstop6h 07m
$402
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mi 10/7
3:43 pm-12:05 am
Nonstop5h 22m
Boston Logan Intl
Fr 10/16
8:50 am-4:47 pm
1 stop10h 57m
$405
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mo 5/25
11:00 pm-7:35 am
Nonstop5h 35m
Boston Logan Intl
Mo 6/1
7:30 pm-10:40 pm
Nonstop6h 10m
$412
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mo 6/1
4:10 pm-12:40 am
Nonstop5h 30m
Boston Logan Intl
Fr 6/5
6:15 am-11:53 pm
1 stop20h 38m
$415
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mi 5/20
11:45 pm-12:40 pm
1 stop9h 55m
Boston Logan Intl
Mi 5/27
2:25 pm-11:35 pm
2 stops12h 10m
$415
Showing 1-10 of 23 resultsSorted by cheapest first
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 April.
| 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*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- 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?
Booking 69 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, September is the cheapest month in which you can book a flight from Seattle to Boston (average of $307). Flying from Seattle to Boston in December is currently the most expensive (average of $532). 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 April 29, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 46% 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 April 25, 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. Sunday afternoons 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 173 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?
Saturday 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 11% 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 April 29, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andHawaiian 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.
Food
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Food
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Food
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Food
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Food
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Food
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Comfort
7.8
Entertainment
7.0
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
Concord
Hampton Beach
Watertown
Brockton
Seekonk
Cranston
Chelsea
Warwick
Peabody
Seabrook
York Beach
Londonderry
Swansea
Old Orchard Beach
Quincy
Waltham
Lowell
Braintree
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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 April 29, 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
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Seattle and Boston flights
Browse other Seattle and Boston flight options. Last updated on April 29, 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 April 29, 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 April 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$302 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$141 | Average$325 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$155 | Average$402 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$178 | Average$402 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$194 | Average$326 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$196 | Average$402 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$233 | Average$457 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$234 | Average$451 | FlexibilityNo cancel fee | On-time75% |