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

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 Washington (IAD) to Seattle (SEA)

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were CA $520 round trip and CA $288 one way. Prices and availability subject to change. Additional terms may apply.

Wed, Nov 4 - Tue, Nov 10
IAD
Washington
SEA
Seattle
CA $520 Roundtrip, found 2 days ago
CA $520
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Nov 4 from Washington to Seattle, returning Tue, Nov 10, priced at CA $520 found 2 days ago
Tue, Nov 17 - Sun, Nov 22
IAD
Washington
SEA
Seattle
CA $521 Roundtrip, found 19 hours ago
CA $521
Roundtrip
found 19 hours ago
Select Alaska Airlines flight, departing Tue, Nov 17 from Washington to Seattle, returning Sun, Nov 22, priced at CA $521 found 19 hours ago
Sat, Oct 24 - Sat, Oct 31
IAD
Washington
SEA
Seattle
CA $523 Roundtrip, found 5 days ago
CA $523
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Oct 24 from Washington to Seattle, returning Sat, Oct 31, priced at CA $523 found 5 days ago
Sat, Oct 24 - Sat, Oct 31
IAD
Washington
SEA
Seattle
CA $523 Roundtrip, found 5 days ago
CA $523
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sat, Oct 24 from Washington to Seattle, returning Sat, Oct 31, priced at CA $523 found 5 days ago
Thu, Sep 24 - Wed, Sep 30
IAD
Washington
SEA
Seattle
CA $526 Roundtrip, found 1 day ago
CA $526
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Sep 24 from Washington to Seattle, returning Wed, Sep 30, priced at CA $526 found 1 day ago
Wed, Oct 14 - Wed, Oct 21
IAD
Washington
SEA
Seattle
CA $527 Roundtrip, found 3 days ago
CA $527
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Wed, Oct 14 from Washington to Seattle, returning Wed, Oct 21, priced at CA $527 found 3 days ago
Wed, Oct 14 - Sun, Oct 18
IAD
Washington
SEA
Seattle
CA $529 Roundtrip, found 22 hours ago
CA $529
Roundtrip
found 22 hours ago
Select Alaska Airlines flight, departing Wed, Oct 14 from Washington to Seattle, returning Sun, Oct 18, priced at CA $529 found 22 hours ago
Fri, Oct 16 - Sun, Oct 25
IAD
Washington
SEA
Seattle
CA $530 Roundtrip, found 1 hour ago
CA $530
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Fri, Oct 16 from Washington to Seattle, returning Sun, Oct 25, priced at CA $530 found 1 hour ago
Wed, Oct 7 - Wed, Oct 14
IAD
Washington
SEA
Seattle
CA $531 Roundtrip, found 6 days ago
CA $531
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Wed, Oct 7 from Washington to Seattle, returning Wed, Oct 14, priced at CA $531 found 6 days ago
Sat, Oct 24 - Sat, Oct 31
IAD
Washington
SEA
Seattle
CA $550 Roundtrip, found 5 days ago
CA $550
Roundtrip
found 5 days ago
Select American Airlines flight, departing Sat, Oct 24 from Washington to Seattle, returning Sat, Oct 31, priced at CA $550 found 5 days ago

Seattle - Tacoma Intl. flight + hotel packages - economy flights

Price found within the past 48 hours. Click for updated prices.
The Belltown Inn

The Belltown Inn

2.5 out of 5
Price was CA $923, price is now CA $806 per person
CA $806
per person
Oct 24 - Oct 26
found 1 day ago
Roundtrip non-stop flight included
Washington (DCA) to Seattle (SEA)
The State Hotel

The State Hotel

4 out of 5
Price was CA $1,144, price is now CA $956 per person
CA $956
per person
Oct 24 - Oct 26
found 1 day ago
Roundtrip non-stop flight included
Washington (DCA) to Seattle (SEA)
Mediterranean Inn

Mediterranean Inn

3 out of 5
Price was CA $987, price is now CA $826 per person
CA $826
per person
Oct 24 - Oct 26
found 1 day ago
Roundtrip non-stop flight included
Washington (DCA) to Seattle (SEA)
Mayflower Park Hotel

Mayflower Park Hotel

4 out of 5
Price was CA $1,021, price is now CA $867 per person
CA $867
per person
Oct 24 - Oct 26
found 1 day ago
Roundtrip non-stop flight included
Washington (DCA) to Seattle (SEA)
The Arctic Club Seattle

The Arctic Club Seattle

4 out of 5
Price was CA $1,167, price is now CA $1,038 per person
CA $1,038
per person
Oct 24 - Oct 26
found 1 day ago
Roundtrip non-stop flight included
Washington (DCA) to Seattle (SEA)
Don't see what you're looking for?
See all available trips from Washington Dulles Intl. to Seattle - Tacoma Intl.
View all trips

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.

Explore More Ways to Travel with 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.