Find Deals on Flights from Washington Dulles Intl to Seattle/Tacoma Intl (IAD - SEA)

Depart
Return
1 adult
Adults
18-64
Seniors
65+
Youths
12-17
Children
2-11
Seat Infants
under 2
Lap Infants
under 2
The price shown for each flight will be the average for all passengers including any infants.
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Book cheap flights from Washington Dulles Intl to Seattle/Tacoma Intl

(Round-trip)
Depart: Sat Oct 1 2016 Return: Sat Oct 8 2016 Trip spans 8 days
Depart: Sat Sep 10 2016 Return: Wed Sep 14 2016 Trip spans 5 days
Depart: Tue Nov 1 2016 Return: Tue Nov 8 2016 Trip spans 8 days
Depart: Tue Oct 25 2016 Return: Wed Nov 2 2016 Trip spans 9 days
Depart: Tue Nov 15 2016 Return: Tue Nov 29 2016 Trip spans 15 days
Depart: Sat Nov 19 2016 Return: Fri Nov 25 2016 Trip spans 7 days
Depart: Sun Nov 20 2016 Return: Thu Nov 24 2016 Trip spans 5 days
Depart: Fri Jan 6 2017 Return: Thu Jan 12 2017 Trip spans 7 days
Depart: Tue Oct 4 2016 Return: Thu Oct 6 2016 Trip spans 3 days
Depart: Tue Oct 11 2016 Return: Tue Oct 18 2016 Trip spans 8 days
Depart: Tue Sep 13 2016 Return: Tue Sep 20 2016 Trip spans 8 days
Depart: Wed Oct 19 2016 Return: Wed Nov 16 2016 Trip spans 29 days
Depart: Wed Sep 14 2016 Return: Tue Sep 20 2016 Trip spans 7 days
Depart: Mon Oct 24 2016 Return: Sat Oct 29 2016 Trip spans 6 days
Depart: Sat Sep 17 2016 Return: Tue Sep 27 2016 Trip spans 11 days
Depart: Wed Oct 26 2016 Return: Tue Nov 1 2016 Trip spans 7 days
Depart: Tue Sep 20 2016 Return: Wed Sep 21 2016 Trip spans 2 days
Depart: Sat Nov 5 2016 Return: Tue Nov 8 2016 Trip spans 4 days
Depart: Sat Nov 12 2016 Return: Sun Nov 13 2016 Trip spans 2 days
Depart: Sat Feb 11 2017 Return: Tue Feb 14 2017 Trip spans 4 days
Direct flights IAD to SEA on United
Flight # Depart IAD Arrive SEA Sun Mon Tue Wed Thu Fri Sat Valid Between
389 8:15 am 10:57 am Sep 6 - Sep 6
389 8:55 am 11:37 am Sep 16 - Sep 23
389 8:55 am 11:35 am Sep 4 - Sep 4
389 8:55 am 11:37 am Sep 5 - Sep 5
389 8:55 am 11:37 am Sep 8 - Sep 15
389 8:55 am 11:37 am Sep 7 - Sep 7
389 8:55 am 11:37 am Sep 25 - Oct 5
389 8:55 am 11:37 am Sep 9 - Sep 9
389 8:55 am 11:37 am Sep 24 - Sep 24
1603 3:45 pm 6:21 pm Sep 11 - Oct 2
1603 3:50 pm 6:26 pm Sep 7 - Sep 27
1603 3:50 pm 6:26 pm Sep 29 - Oct 5
1603 3:55 pm 6:27 pm Aug 25 - Sep 6
1603 4:05 pm 6:41 pm Sep 28 - Sep 28
326 5:45 pm 8:34 pm Sep 24 - Sep 24
326 5:45 pm 8:34 pm Oct 1 - Oct 1
326 5:45 pm 8:34 pm Sep 10 - Sep 17
326 6:35 pm 9:24 pm Oct 5 - Oct 5
326 6:35 pm 9:24 pm Oct 4 - Oct 4
326 6:35 pm 9:24 pm Sep 5 - Sep 5
326 6:35 pm 9:24 pm Sep 7 - Sep 19
326 6:35 pm 9:24 pm Aug 28 - Sep 4
326 6:35 pm 9:24 pm Oct 3 - Oct 3
326 6:35 pm 9:24 pm Sep 6 - Sep 6
326 6:35 pm 9:24 pm Sep 20 - Sep 30
326 6:35 pm 9:24 pm Sep 13 - Sep 13
326 7:32 pm 10:21 pm Sep 18 - Sep 25
326 7:32 pm 10:21 pm Sep 11 - Sep 11
326 7:32 pm 10:21 pm Oct 2 - Oct 2
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

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Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

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Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

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Airports
Origin

Washington
$244
Destination

Seattle
$244
Airlines Airline reviews

51 travelers who booked a flight from Washington to Seattle rated their chosen airlines with an average of 7.2.

Overall
7.4
Boarding
7.6
Crew
8.0
Comfort
7.2
Food
6.4
Entertainment
6.1