$119+ 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 4/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BOS
Apr 9 — Apr 161
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 Tuesday or Wednesday 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 March 10, 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 March 10, 2026.
This Delta deal was found by Cheapflights users on 3/5. 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 5/111:14 pm
SEA
- BOS
1 stop6h 57m
Delta
Mon 5/47:37 am
BOS
- SEA
Nonstop6h 18m
Delta
Deal found 3/5![Delta logo]()
$227
This United Airlines deal was found by Cheapflights users on 3/6. 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.
Fri 5/11:07 pm
SEA
- BOS
1 stop7h 52m
United Airlines
Mon 5/46:39 pm
BOS
- SEA
1 stop8h 20m
United Airlines
Deal found 3/6![United Airlines logo]()
$232
This American Airlines deal was found by Cheapflights users on 3/7. 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.
Tue 4/2112:59 am
SEA
- BOS
1 stop9h 12m
American Airlines
Wed 4/296:48 pm
BOS
- SEA
1 stop8h 48m
American Airlines
Deal found 3/7![American Airlines logo]()
$236
This Southwest deal was found by Cheapflights users on 3/6. 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.
Fri 5/16:15 pm
SEA
- BOS
2 stops10h 50m
Southwest
Mon 5/46:55 pm
BOS
- SEA
1 stop8h 10m
Southwest
Deal found 3/6![Southwest logo]()
$242
This United Airlines deal was found by Cheapflights users on 3/5. 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.
Wed 5/207:05 pm
SEA
- BOS
1 stop7h 59m
United Airlines
Wed 5/276:35 pm
BOS
- SEA
1 stop8h 24m
United Airlines
Deal found 3/5![United Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 3/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:15 pm
SEA
- BOS
2 stops11h 00m
Southwest
Wed 4/152:25 pm
BOS
- SEA
1 stop12h 45m
Southwest
Deal found 3/8![Southwest logo]()
$248
This Orbitz deal was found by Cheapflights users on 3/9. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2011:30 am
SEA
- BOS
Nonstop5h 35m
Multiple Airlines
Wed 5/276:40 pm
BOS
- SEA
1 stop17h 45m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$253
This Delta deal was found by Cheapflights users on 3/9. 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 10/311:50 am
SEA
- BOS
Nonstop5h 40m
Delta
Tue 10/133:30 pm
BOS
- SEA
Nonstop6h 29m
Delta
Deal found 3/9![Delta logo]()
$257
This Delta deal was found by Cheapflights users on 3/9. 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 4/83:45 pm
SEA
- BOS
Nonstop5h 14m
Delta
Tue 4/148:05 am
BOS
- SEA
2 stops14h 00m
Delta
Deal found 3/9![Delta logo]()
$262
This EaseMyTrip deal was found by Cheapflights users on 3/7. 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 EaseMyTrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/910:45 pm
SEA
- BOS
Nonstop5h 27m
Alaska Airlines
Fri 5/157:11 pm
BOS
- SEA
Nonstop6h 16m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$263
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 March 10, 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 March 10, 2026.
This Delta deal was found by Cheapflights users on 3/5. 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 5/74:10 pm
SEA
- BOS
Nonstop5h 32m
Delta
Tue 5/267:30 pm
BOS
- SEA
Nonstop6h 10m
Delta
Deal found 3/5![Delta logo]()
$237
This Southwest deal was found by Cheapflights users on 3/5. 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.
Mon 4/2011:55 pm
SEA
- BOS
2 stops9h 20m
Southwest
Wed 4/294:45 pm
BOS
- SEA
1 stop8h 45m
Southwest
Deal found 3/5![Southwest logo]()
$242
This Alaska Airlines deal was found by Cheapflights users on 3/7. 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 5/57:00 am
SEA
- BOS
Nonstop5h 33m
Alaska Airlines
Wed 5/66:42 pm
BOS
- SEA
Nonstop6h 17m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$257
This United Airlines deal was found by Cheapflights users on 3/7. 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.
Wed 5/207:05 pm
SEA
- BOS
1 stop7h 59m
United Airlines
Wed 5/275:44 pm
BOS
- SEA
1 stop9h 00m
United Airlines
Deal found 3/7![United Airlines logo]()
$290
This Southwest deal was found by Cheapflights users on 3/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:15 pm
SEA
- BOS
2 stops11h 00m
Southwest
Wed 4/152:25 pm
BOS
- SEA
1 stop12h 45m
Southwest
Deal found 3/8![Southwest logo]()
$248
This Delta deal was found by Cheapflights users on 3/7. 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.
Tue 7/283:55 pm
SEA
- BOS
Nonstop5h 28m
Delta
Tue 8/46:35 pm
BOS
- SEA
Nonstop6h 30m
Delta
Deal found 3/7![Delta logo]()
$257
This Delta deal was found by Cheapflights users on 3/5. 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 4/3011:14 pm
SEA
- BOS
1 stop6h 57m
Delta
Sun 5/35:50 am
BOS
- SEA
1 stop8h 05m
Delta
Deal found 3/5![Delta logo]()
$307
This Delta deal was found by Cheapflights users on 3/5. 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 4/24:55 pm
SEA
- BOS
1 stop10h 15m
Delta
Sun 4/56:15 am
BOS
- SEA
1 stop11h 39m
Delta
Deal found 3/5![Delta logo]()
$307
This Southwest deal was found by Cheapflights users on 3/9. 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.
Thu 6/117:20 pm
SEA
- BOS
2 stops9h 50m
Southwest
Tue 6/165:30 pm
BOS
- SEA
1 stop9h 50m
Southwest
Deal found 3/9![Southwest logo]()
$352
This Delta deal was found by Cheapflights users on 3/9. 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 5/1111:00 pm
SEA
- BOS
Nonstop5h 35m
Delta
Fri 5/157:30 pm
BOS
- SEA
Nonstop6h 10m
Delta
Deal found 3/9![Delta logo]()
$327
This Delta deal was found by Cheapflights users on 3/6. 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.
Thu 8/203:55 pm
SEA
- BOS
Nonstop5h 28m
Delta
Sun 8/237:05 am
BOS
- SEA
Nonstop6h 27m
Delta
Deal found 3/6![Delta logo]()
$352
Last-minute flights from Seattle to BostonDiscover last-minute flight deals from Seattle to Boston. Data last updated March 10, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Boston. Data last updated March 10, 2026 and is based on user searches.
This Kissandfly.com deal was found by Cheapflights users on 3/7. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/2910:15 pm
SEA
- BOS
Nonstop5h 24m
Alaska Airlines
Sat 4/43:05 pm
BOS
- SEA
1 stop9h 01m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$253
This Southwest deal was found by Cheapflights users on 3/9. 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.
Mon 3/3011:55 pm
SEA
- BOS
1 stop8h 25m
Southwest
Tue 4/76:20 pm
BOS
- SEA
1 stop8h 50m
Southwest
Deal found 3/9![Southwest logo]()
$237
This Southwest deal was found by Cheapflights users on 3/9. 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 4/15:30 am
SEA
- BOS
1 stop9h 15m
Southwest
Wed 4/82:25 pm
BOS
- SEA
1 stop12h 45m
Southwest
Deal found 3/9![Southwest logo]()
$272
This Delta deal was found by Cheapflights users on 3/9. 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 4/83:45 pm
SEA
- BOS
Nonstop5h 14m
Delta
Tue 4/148:05 am
BOS
- SEA
2 stops14h 00m
Delta
Deal found 3/9![Delta logo]()
$262
This Southwest deal was found by Cheapflights users on 3/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:15 pm
SEA
- BOS
2 stops11h 00m
Southwest
Wed 4/152:25 pm
BOS
- SEA
1 stop12h 45m
Southwest
Deal found 3/8![Southwest logo]()
$248
This United Airlines deal was found by Cheapflights users on 3/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/172:39 pm
SEA
- BOS
1 stop7h 20m
United Airlines
Wed 4/292:37 pm
BOS
- SEA
1 stop9h 16m
United Airlines
Deal found 3/8![United Airlines logo]()
$270
This Expedia deal was found by Cheapflights users on 3/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/203:38 pm
SEA
- BOS
Nonstop5h 21m
Alaska Airlines
Wed 4/295:56 pm
BOS
- SEA
1 stop18h 30m
Alaska Airlines
Deal found 3/5![Alaska Airlines logo]()
$227
This American Airlines deal was found by Cheapflights users on 3/7. 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.
Tue 4/2112:59 am
SEA
- BOS
1 stop9h 12m
American Airlines
Wed 4/296:48 pm
BOS
- SEA
1 stop8h 48m
American Airlines
Deal found 3/7![American Airlines logo]()
$236
This Delta deal was found by Cheapflights users on 3/9. 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.
Tue 4/213:40 pm
SEA
- BOS
Nonstop5h 19m
Delta
Tue 5/127:30 pm
BOS
- SEA
Nonstop6h 10m
Delta
Deal found 3/9![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 3/5. 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.
Wed 4/297:10 pm
SEA
- BOS
2 stops9h 55m
Southwest
Sat 5/21:50 pm
BOS
- SEA
2 stops11h 20m
Southwest
Deal found 3/5![Southwest logo]()
$247
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 March 10, 2026.
Search for one-way flight options from Seattle to Boston. Find affordable one-way fares based on user searches. Data last updated March 10, 2026.
This United Airlines deal was found by Cheapflights users on 3/9. 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 4/87:12 am
SEA
- BOS
1 stop8h 54m
United Airlines
Deal found 3/9![United Airlines logo]()
$119
This Southwest deal was found by Cheapflights users on 3/5. 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.
Wed 5/137:10 pm
SEA
- BOS
2 stops9h 55m
Southwest
Deal found 3/5![Southwest logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 5/1910:42 am
SEA
- BOS
2 stops20h 39m
Frontier
Deal found 3/5![Frontier logo]()
$127
This Delta deal was found by Cheapflights users on 3/9. 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 7/223:55 pm
SEA
- BOS
Nonstop5h 28m
Delta
Deal found 3/9![Delta logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 3/9. 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 3/309:40 pm
SEA
- BOS
2 stops24h 33m
Frontier
Deal found 3/9![Frontier logo]()
$133
This United Airlines deal was found by Cheapflights users on 3/9. 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 5/277:40 am
SEA
- BOS
1 stop8h 34m
United Airlines
Deal found 3/9![United Airlines logo]()
$134
This United Airlines deal was found by Cheapflights users on 3/9. 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 6/911:52 pm
SEA
- BOS
1 stop8h 13m
United Airlines
Deal found 3/9![United Airlines logo]()
$139
This CheapOair deal was found by Cheapflights users on 3/5. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/226:21 am
SEA
- BOS
1 stop20h 22m
Alaska Airlines
Deal found 3/5![Alaska Airlines logo]()
$144
This United Airlines deal was found by Cheapflights users on 3/9. 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 5/281:00 pm
SEA
- BOS
1 stop7h 59m
United Airlines
Deal found 3/9![United Airlines logo]()
$146
This United Airlines deal was found by Cheapflights users on 3/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/131:07 pm
SEA
- BOS
1 stop7h 52m
United Airlines
Deal found 3/8![United Airlines logo]()
$148
This Cheapflightsfares deal was found by Cheapflights users on 3/5. 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.
Mon 6/1511:41 pm
SEA
- BOS
Nonstop5h 18m
JetBlue
Deal found 3/5![JetBlue logo]()
$149
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 March 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $227 (Delta) |
One-way from | $119 (United Airlines) |
Popular in | December |
Cheapest in | September |
Average price | $346 |
Good round-trip deal | $274 or less |
Good one-way deal | $200 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 March 10, 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
Quickest round-trip
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Thu 5/7
4:10 pm-12:42 am
Nonstop5h 32m
Boston Logan Intl
Tue 5/26
7:30 pm-10:40 pm
Nonstop6h 10m
$237
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mon 4/20
11:55 pm-12:15 pm
2 stops9h 20m
Boston Logan Intl
Wed 4/29
4:45 pm-10:30 pm
1 stop8h 45m
$242
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mon 4/13
6:15 pm-8:15 am
2 stops11h 00m
Boston Logan Intl
Wed 4/15
2:25 pm-12:10 am
1 stop12h 45m
$248
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Tue 5/5
7:00 am-3:33 pm
Nonstop5h 33m
Boston Logan Intl
Wed 5/6
6:42 pm-9:59 pm
Nonstop6h 17m
$257
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Tue 7/28
3:55 pm-12:23 am
Nonstop5h 28m
Boston Logan Intl
Tue 8/4
6:35 pm-10:05 pm
Nonstop6h 30m
$257
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Wed 5/20
7:05 pm-6:04 am
1 stop7h 59m
Boston Logan Intl
Wed 5/27
5:44 pm-11:44 pm
1 stop9h 00m
$290
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Thu 4/30
11:14 pm-9:11 am
1 stop6h 57m
Boston Logan Intl
Sun 5/3
5:50 am-10:55 am
1 stop8h 05m
$307
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Thu 4/2
4:55 pm-6:10 am
1 stop10h 15m
Boston Logan Intl
Sun 4/5
6:15 am-2:54 pm
1 stop11h 39m
$307
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Mon 5/11
11:00 pm-7:35 am
Nonstop5h 35m
Boston Logan Intl
Fri 5/15
7:30 pm-10:40 pm
Nonstop6h 10m
$327
SeattleBoston
SEA - BOS
SEABOS
Seattle/Tacoma Intl
Thu 6/11
7:20 pm-8:10 am
2 stops9h 50m
Boston Logan Intl
Tue 6/16
5:30 pm-12:20 am
1 stop9h 50m
$352
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 March.
| 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 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 March 6, 2026.
Booking 70 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, October is the cheapest month in which you can book a flight from Seattle to Boston (average of $118). 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 March 10, 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 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 168 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 March 10, 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.
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Food
7.1
Overall
8.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Food
7.1
Overall
8.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Food
7.1
Overall
8.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Food
7.1
Overall
8.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Food
7.1
Overall
8.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Comfort
7.8
Boarding
8.1
Entertainment
7.0
Crew
8.5
Food
7.1
Overall
8.0
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
Seekonk
Brockton
Seabrook
Cranston
Chelsea
Smithfield
Lincoln
Warwick
Peabody
Waltham
York Beach
Londonderry
Swansea
Old Orchard Beach
Quincy
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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 March 10, 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 March 10, 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 March 10, 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 March 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$298 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$127 | Average$322 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$151 | Average$380 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$178 | Average$409 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$196 | Average$397 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$223 | Average$457 | FlexibilityNo cancel fee | On-time83% | |
| Cheapest$237 | Average$452 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$281 | Average$336 | FlexibilityNo cancel fee | On-time63% |