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

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

The cheapest flights to Washington Dulles Intl. found within the past 7 days were CA $219 round trip and CA $138 one way. Prices and availability subject to change. Additional terms may apply.

Tue, Jan 13 - Fri, Jan 23
SEA
Seattle
IAD
Washington
CA $219 Roundtrip, found 11 hours ago
CA $219
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Tue, Jan 13 from Seattle to Washington, returning Fri, Jan 23, priced at CA $219 found 11 hours ago
Tue, Jan 13 - Thu, Jan 22
SEA
Seattle
IAD
Washington
CA $219 Roundtrip, found 11 hours ago
CA $219
Roundtrip
found 11 hours ago
Select Hawaiian Airlines flight, departing Tue, Jan 13 from Seattle to Washington, returning Thu, Jan 22, priced at CA $219 found 11 hours ago
Sat, Jan 17 - Fri, Jan 30
SEA
Seattle
IAD
Washington
CA $220 Roundtrip, found 10 hours ago
CA $220
Roundtrip
found 10 hours ago
Select Delta flight, departing Sat, Jan 17 from Seattle to Washington, returning Fri, Jan 30, priced at CA $220 found 10 hours ago
Thu, Jan 22 - Wed, Jan 28
SEA
Seattle
IAD
Washington
CA $221 Roundtrip, found 6 hours ago
CA $221
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Thu, Jan 22 from Seattle to Washington, returning Wed, Jan 28, priced at CA $221 found 6 hours ago
Wed, Jan 14 - Sun, Jan 18
SEA
Seattle
IAD
Washington
CA $224 Roundtrip, found 7 hours ago
CA $224
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Wed, Jan 14 from Seattle to Washington, returning Sun, Jan 18, priced at CA $224 found 7 hours ago
Tue, Jan 20 - Fri, Jan 30
SEA
Seattle
IAD
Washington
CA $225 Roundtrip, found 10 hours ago
CA $225
Roundtrip
found 10 hours ago
Select Delta flight, departing Tue, Jan 20 from Seattle to Washington, returning Fri, Jan 30, priced at CA $225 found 10 hours ago
Mon, Jan 12 - Tue, Jan 20
SEA
Seattle
IAD
Washington
CA $233 Roundtrip, found 11 hours ago
CA $233
Roundtrip
found 11 hours ago
Select Delta flight, departing Mon, Jan 12 from Seattle to Washington, returning Tue, Jan 20, priced at CA $233 found 11 hours ago
Mon, Jan 12 - Sun, Jan 18
SEA
Seattle
IAD
Washington
CA $236 Roundtrip, found 11 hours ago
CA $236
Roundtrip
found 11 hours ago
Select Delta flight, departing Mon, Jan 12 from Seattle to Washington, returning Sun, Jan 18, priced at CA $236 found 11 hours ago
Mon, Jan 19 - Sun, Jan 25
SEA
Seattle
IAD
Washington
CA $260 Roundtrip, found 10 hours ago
CA $260
Roundtrip
found 10 hours ago
Select Alaska Airlines flight, departing Mon, Jan 19 from Seattle to Washington, returning Sun, Jan 25, priced at CA $260 found 10 hours ago
Wed, Jan 14 - Wed, Jan 14
SEA
Seattle
IAD
Washington
CA $273 Roundtrip, found 12 hours ago
CA $273
Roundtrip
found 12 hours ago
Select Alaska Airlines flight, departing Wed, Jan 14 from Seattle to Washington, returning Wed, Jan 14, priced at CA $273 found 12 hours ago

Frequently asked questions

Are there direct flights from Sea-Tac Airport to Washington Dulles Intl. Airport (IAD)?
Sometimes, it's the journey that counts; other times, it's all about the destination. If you're eager to get to where you're going fast, multiple airlines advertise direct flights from Sea-Tac Airport to Washington Dulles Intl. Airport (IAD), including Alaska Airlines and United Airlines.
What airlines fly from SEA to IAD?
If you're heading to Sterling from Seattle, there are several airlines with direct flights. One of the top carriers is Alaska Airlines (AS), which operates 52 flights each month. You should also check out the deals available through United Airlines (UA). This carrier operates 30 flights monthly on the Seattle to Sterling route. Be sure to compare the two airlines to score 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 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 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!

*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.