Cheap Flights From Seattle - Tacoma Intl. (SEA) To Logan Intl. (BOS)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly

Cheapest Flights from Seattle (SEA) to Boston (BOS)

The cheapest flights to Logan Intl. found within the past 7 days were CA $295 round trip and CA $150 one way. Prices and availability subject to change. Additional terms may apply.

Sat., Sep. 13 - Sat., Sep. 20
SEA
Seattle
BOS
Boston
CA $295 Roundtrip, found 3 days ago
CA $295
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Sat., Sep. 13 from Seattle to Boston, returning Sat., Sep. 20, priced at CA $295 found 3 days ago
Sat., Nov. 8 - Wed., Nov. 12
SEA
Seattle
BOS
Boston
CA $296 Roundtrip, found 5 days ago
CA $296
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Sat., Nov. 8 from Seattle to Boston, returning Wed., Nov. 12, priced at CA $296 found 5 days ago
Sat., Sep. 6 - Sat., Sep. 13
SEA
Seattle
BOS
Boston
CA $297 Roundtrip, found 14 hours ago
CA $297
Roundtrip
found 14 hours ago
Select Alaska Airlines flight, departing Sat., Sep. 6 from Seattle to Boston, returning Sat., Sep. 13, priced at CA $297 found 14 hours ago
Sat., Sep. 6 - Sat., Sep. 13
SEA
Seattle
BOS
Boston
CA $298 Roundtrip, found 14 hours ago
CA $298
Roundtrip
found 14 hours ago
Select Alaska Airlines flight, departing Sat., Sep. 6 from Seattle to Boston, returning Sat., Sep. 13, priced at CA $298 found 14 hours ago
Tue., Sep. 30 - Thu., Oct. 2
SEA
Seattle
BOS
Boston
CA $308 Roundtrip, found 3 days ago
CA $308
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Tue., Sep. 30 from Seattle to Boston, returning Thu., Oct. 2, priced at CA $308 found 3 days ago
Tue., Sep. 30 - Thu., Oct. 2
SEA
Seattle
BOS
Boston
CA $309 Roundtrip, found 3 days ago
CA $309
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Tue., Sep. 30 from Seattle to Boston, returning Thu., Oct. 2, priced at CA $309 found 3 days ago
Thu., Sep. 4 - Wed., Sep. 10
SEA
Seattle
BOS
Boston
CA $310 Roundtrip, found 5 days ago
CA $310
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Thu., Sep. 4 from Seattle to Boston, returning Wed., Sep. 10, priced at CA $310 found 5 days ago
Sat., Sep. 6 - Sat., Sep. 13
SEA
Seattle
BOS
Boston
CA $311 Roundtrip, found 14 hours ago
CA $311
Roundtrip
found 14 hours ago
Select Alaska Airlines flight, departing Sat., Sep. 6 from Seattle to Boston, returning Sat., Sep. 13, priced at CA $311 found 14 hours ago
Tue., Aug. 26 - Sat., Sep. 6
SEA
Seattle
BOS
Boston
CA $315 Roundtrip, found 2 days ago
CA $315
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue., Aug. 26 from Seattle to Boston, returning Sat., Sep. 6, priced at CA $315 found 2 days ago
Tue., Aug. 26 - Sat., Sep. 6
SEA
Seattle
BOS
Boston
CA $316 Roundtrip, found 2 days ago
CA $316
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue., Aug. 26 from Seattle to Boston, returning Sat., Sep. 6, priced at CA $316 found 2 days ago

Frequently asked questions

Are there direct flights from Sea-Tac Airport to BOS?
If you're looking to venture from SEA to BOS in the shortest possible time, you'll be glad to know multiple airlines operate nonstop flights. Choose your preferred seat with Delta or Alaska Airlines.
What airlines fly from Sea-Tac Airport to BOS?
There are a couple of airlines advertising direct flights from SEA to Logan Intl. Airport (BOS). Delta (DL) is one of the most reliable, and operates 86 flights every month. If that's not enough for you, have a look at the fares on offer from Alaska Airlines (AS). This airline operates 82 flights on the Seattle to Boston route each month. Between the two, you're bound to find the flight to suit your travel needs.
What is the best day to buy a plane ticket?
Airfares offered on Friday tend to be the cheapest, according to flight demand on Travelocity.ca in 2021. Purchasing your airfares on a Thursday or Saturday can also provide better value, however our advice if you're looking to save money is to avoid booking on a Wednesday or Sunday. Our data shows that those two days have the highest ticket values on average, so keep this in mind if you're browsing flight deals.
What are the cheapest days to fly?
Frequent travellers may already know this, but earlier in the week is often the cheapest time to fly. Flights departing on a Monday are the cheapest of the week. Since flights towards the middle of the week tend to be more popular, this causes the prices to rise. This is why, on average, airfares booked on Travelocity.ca in 2021 were most expensive for Wednesday departures.
How far in advance can you book a flight?
Here's the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.

Popular Flight Routes from Seattle (SEA)

Travelers at SEA love to visit these top cities. Roam to the top destinations from Seattle (SEA) today with the cheap prices from Travelocity!

Popular Flight Routes from Boston (BOS)

Travelers at BOS love to visit these top cities. Roam to the top destinations from Boston(BOS) today with the cheap prices from Travelocity!

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.