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

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

The cheapest flights to Logan Intl. found within the past 7 days were CA $270 round trip and CA $136 one way. Prices and availability subject to change. Additional terms may apply.

Sat, Nov. 1 - Sat, Nov. 8
SEA
Seattle
BOS
Boston
CA $270 Roundtrip, found 4 days ago
CA $270
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Sat, Nov. 1 from Seattle to Boston, returning Sat, Nov. 8, priced at CA $270 found 4 days ago
Sat, Nov. 8 - Tue, Nov. 11
SEA
Seattle
BOS
Boston
CA $271 Roundtrip, found 6 days ago
CA $271
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Sat, Nov. 8 from Seattle to Boston, returning Tue, Nov. 11, priced at CA $271 found 6 days ago
Tue, Oct. 14 - Sat, Oct. 18
SEA
Seattle
BOS
Boston
CA $272 Roundtrip, just found
CA $272
Roundtrip
just found
Select JetBlue Airways flight, departing Tue, Oct. 14 from Seattle to Boston, returning Sat, Oct. 18, priced at CA $272 just found
Wed, Oct. 1 - Wed, Oct. 8
SEA
Seattle
BOS
Boston
CA $276 Roundtrip, found 3 days ago
CA $276
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Wed, Oct. 1 from Seattle to Boston, returning Wed, Oct. 8, priced at CA $276 found 3 days ago
Tue, Oct. 7 - Wed, Oct. 15
SEA
Seattle
BOS
Boston
CA $277 Roundtrip, found 3 days ago
CA $277
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Tue, Oct. 7 from Seattle to Boston, returning Wed, Oct. 15, priced at CA $277 found 3 days ago
Tue, Oct. 14 - Mon, Oct. 20
SEA
Seattle
BOS
Boston
CA $298 Roundtrip, found 4 days ago
CA $298
Roundtrip
found 4 days ago
Select JetBlue Airways flight, departing Tue, Oct. 14 from Seattle to Boston, returning Mon, Oct. 20, priced at CA $298 found 4 days ago
Tue, Oct. 14 - Fri, Oct. 17
SEA
Seattle
BOS
Boston
CA $300 Roundtrip, just found
CA $300
Roundtrip
just found
Select JetBlue Airways flight, departing Tue, Oct. 14 from Seattle to Boston, returning Fri, Oct. 17, priced at CA $300 just found
Mon, Sep. 22 - Mon, Sep. 29
SEA
Seattle
BOS
Boston
CA $305 Roundtrip, found 1 day ago
CA $305
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Mon, Sep. 22 from Seattle to Boston, returning Mon, Sep. 29, priced at CA $305 found 1 day ago
Wed, Dec. 3 - Sat, Dec. 6
SEA
Seattle
BOS
Boston
CA $312 Roundtrip, found 4 days ago
CA $312
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Dec. 3 from Seattle to Boston, returning Sat, Dec. 6, priced at CA $312 found 4 days ago
Wed, Oct. 15 - Fri, Oct. 17
SEA
Seattle
BOS
Boston
CA $326 Roundtrip, just found
CA $326
Roundtrip
just found
Select JetBlue Airways flight, departing Wed, Oct. 15 from Seattle to Boston, returning Fri, Oct. 17, priced at CA $326 just found

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.
*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.