Cheap Flights From Washington Dulles Intl. (IAD) To Seattle - Tacoma Intl. (SEA)

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Cheapest Flights from Washington (IAD) to Seattle (SEA)

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were CA $280 round trip and CA $168 one way. Prices and availability subject to change. Additional terms may apply.

Fri, Jan 23 - Tue, Jan 27
IAD
Washington
SEA
Seattle
CA $280 Roundtrip, found 6 days ago
CA $280
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Fri, Jan 23 from Washington to Seattle, returning Tue, Jan 27, priced at CA $280 found 6 days ago
Sat, Feb 21 - Wed, Feb 25
IAD
Washington
SEA
Seattle
CA $281 Roundtrip, found 2 days ago
CA $281
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, Feb 21 from Washington to Seattle, returning Wed, Feb 25, priced at CA $281 found 2 days ago
Sat, Jan 17 - Thu, Jan 22
IAD
Washington
SEA
Seattle
CA $286 Roundtrip, found 5 days ago
CA $286
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sat, Jan 17 from Washington to Seattle, returning Thu, Jan 22, priced at CA $286 found 5 days ago
Sun, Jan 18 - Thu, Jan 22
IAD
Washington
SEA
Seattle
CA $344 Roundtrip, found 5 days ago
CA $344
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sun, Jan 18 from Washington to Seattle, returning Thu, Jan 22, priced at CA $344 found 5 days ago
Sun, Mar 1 - Thu, Mar 12
IAD
Washington
SEA
Seattle
CA $391 Roundtrip, found 2 days ago
CA $391
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sun, Mar 1 from Washington to Seattle, returning Thu, Mar 12, priced at CA $391 found 2 days ago
Sat, Feb 14 - Tue, Feb 17
IAD
Washington
SEA
Seattle
CA $397 Roundtrip, found 2 hours ago
CA $397
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Sat, Feb 14 from Washington to Seattle, returning Tue, Feb 17, priced at CA $397 found 2 hours ago
Fri, Jan 16 - Thu, Jan 22
IAD
Washington
SEA
Seattle
CA $398 Roundtrip, found 5 days ago
CA $398
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Jan 16 from Washington to Seattle, returning Thu, Jan 22, priced at CA $398 found 5 days ago
Sun, Mar 1 - Thu, Mar 12
IAD
Washington
SEA
Seattle
CA $399 Roundtrip, found 2 days ago
CA $399
Roundtrip
found 2 days ago
Select Delta flight, departing Sun, Mar 1 from Washington to Seattle, returning Thu, Mar 12, priced at CA $399 found 2 days ago
Sun, Mar 1 - Thu, Mar 12
IAD
Washington
SEA
Seattle
CA $407 Roundtrip, found 2 days ago
CA $407
Roundtrip
found 2 days ago
Select Delta flight, departing Sun, Mar 1 from Washington to Seattle, returning Thu, Mar 12, priced at CA $407 found 2 days ago
Sat, Jan 10 - Mon, Jan 12
IAD
Washington
SEA
Seattle
CA $409 Roundtrip, found 4 days ago
CA $409
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Sat, Jan 10 from Washington to Seattle, returning Mon, Jan 12, priced at CA $409 found 4 days ago

Frequently asked questions

Are there direct flights from Dulles Intl. Airport to SEA?
Sometimes, a vacation is all about the journey; sometimes the magic is in the destination. If you just want to get to Seattle fast, multiple airlines advertise direct flights from Washington Dulles Intl. Airport (IAD) to SEA, including Alaska Airlines and United Airlines.
What airlines fly from IAD to Sea-Tac Airport?
You can take your pick from a number of airlines advertising direct flights between Sterling and Seattle. Alaska Airlines (AS) is one of the most well-known. This carrier operates roughly 52 flights each month. You should also look up the deals on offer from United Airlines (UA). Another leading airline, it operates 30 flights every month on the Sterling to Seattle route. Compare the two airlines to walk away with the best fare.
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 Washington (IAD)

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

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!

*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.