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

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

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were CA $337 round trip and CA $166 one way. Prices and availability subject to change. Additional terms may apply.

Fri, Dec 5 - Thu, Dec 11
BOS
Boston
SEA
Seattle
CA $337 Roundtrip, found 2 days ago
CA $337
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Boston to Seattle, returning Thu, Dec 11, priced at CA $337 found 2 days ago
Thu, Nov 13 - Mon, Nov 17
BOS
Boston
SEA
Seattle
CA $338 Roundtrip, found 3 days ago
CA $338
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, Nov 13 from Boston to Seattle, returning Mon, Nov 17, priced at CA $338 found 3 days ago
Tue, Nov 11 - Sat, Nov 15
BOS
Boston
SEA
Seattle
CA $377 Roundtrip, found 5 days ago
CA $377
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Tue, Nov 11 from Boston to Seattle, returning Sat, Nov 15, priced at CA $377 found 5 days ago
Fri, Dec 5 - Thu, Dec 11
BOS
Boston
SEA
Seattle
CA $379 Roundtrip, found 2 days ago
CA $379
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Boston to Seattle, returning Thu, Dec 11, priced at CA $379 found 2 days ago
Tue, Nov 11 - Sat, Nov 15
BOS
Boston
SEA
Seattle
CA $391 Roundtrip, found 5 days ago
CA $391
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Tue, Nov 11 from Boston to Seattle, returning Sat, Nov 15, priced at CA $391 found 5 days ago
Fri, Dec 5 - Thu, Dec 11
BOS
Boston
SEA
Seattle
CA $417 Roundtrip, found 2 days ago
CA $417
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Boston to Seattle, returning Thu, Dec 11, priced at CA $417 found 2 days ago
Fri, Dec 5 - Fri, Dec 12
BOS
Boston
SEA
Seattle
CA $431 Roundtrip, found 1 day ago
CA $431
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Boston to Seattle, returning Fri, Dec 12, priced at CA $431 found 1 day ago
Fri, Dec 5 - Fri, Dec 12
BOS
Boston
SEA
Seattle
CA $435 Roundtrip, found 1 day ago
CA $435
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Boston to Seattle, returning Fri, Dec 12, priced at CA $435 found 1 day ago
Thu, Dec 4 - Wed, Dec 10
BOS
Boston
SEA
Seattle
CA $436 Roundtrip, found 4 hours ago
CA $436
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Thu, Dec 4 from Boston to Seattle, returning Wed, Dec 10, priced at CA $436 found 4 hours ago
Fri, Dec 5 - Fri, Dec 12
BOS
Boston
SEA
Seattle
CA $478 Roundtrip, found 1 day ago
CA $478
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Boston to Seattle, returning Fri, Dec 12, priced at CA $478 found 1 day ago

Frequently asked questions

Are there direct flights from Logan Intl. Airport (BOS) to SEA?
Multiple airlines offer flights straight from Logan Intl. Airport to SEA. Among these are Delta and Alaska Airlines — check them out if you want to arrive at your destination as quickly as possible.
What airlines fly from Logan Intl. Airport (BOS) to Seattle - Tacoma Intl. Airport (SEA)?
There are several airlines with direct flights from BOS to Sea-Tac Airport. Delta (DL) is one of the most well-known, operating approximately 86 flights each month. Another attractive option is Alaska Airlines (AS), which has 82 flights each month. The more airlines you take into account, the more likely you are to snap up a fantastic deal.
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.