Find Cheap Flights from Washington Dulles Intl to Seattle

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.
Compare vs. KAYAK all | none
Browse Origins:
Browse Destinations:

Dates flexible? Here are the best fares found in the past 48 hours...

Book cheap flights from Washington Dulles Intl to Seattle

(Round-trip)
Depart: Sat Jul 22 2017 Return: Mon Jul 24 2017 Trip spans 3 days
Delta
Delta
IAD
11:15a
SEA
7:15p
8h 00m
1 stop
SEA
9:10a
IAD
5:01p
7h 51m
1 stop
Depart: Tue Aug 29 2017 Return: Wed Sep 6 2017 Trip spans 9 days
Frontier
Frontier
IAD
2:40p
SEA
8:57a
18h 17m
1 stop
SEA
2:44p
IAD
10:17p
7h 33m
1 stop
Depart: Mon Sep 18 2017 Return: Tue Sep 26 2017 Trip spans 9 days
American Airlines
American Airlines
IAD
9:45a
SEA
7:38p
9h 53m
1 stop
SEA
6:20p
IAD
3:13a
8h 53m
1 stop
Depart: Thu Aug 24 2017 Return: Mon Aug 28 2017 Trip spans 5 days
United
United
IAD
4:15a
SEA
10:03a
5h 48m
nonstop
SEA
6:25p
IAD
11:16p
4h 51m
nonstop
Depart: Thu Nov 16 2017 Return: Mon Dec 4 2017 Trip spans 19 days
Alaska Airlines
Alaska Airlines
IAD
4:05a
SEA
10:02a
5h 57m
nonstop
SEA
10:55a
IAD
3:47p
4h 52m
nonstop
Depart: Mon Jul 24 2017 Return: Fri Jul 28 2017 Trip spans 5 days
Delta
Delta
IAD
2:00a
SEA
9:24a
7h 24m
1 stop
SEA
2:30a
IAD
9:14a
6h 44m
1 stop
Depart: Wed Jul 26 2017 Return: Fri Jul 28 2017 Trip spans 3 days
Delta
Delta
IAD
3:55a
SEA
12:17p
8h 22m
1 stop
SEA
2:30a
IAD
9:14a
6h 44m
1 stop
Depart: Sat Sep 2 2017 Return: Wed Sep 6 2017 Trip spans 5 days
Frontier
Frontier
IAD
2:40p
SEA
8:57a
18h 17m
1 stop
SEA
2:44p
IAD
10:17p
7h 33m
1 stop
Depart: Fri Oct 6 2017 Return: Wed Oct 11 2017 Trip spans 6 days
American Airlines
American Airlines
IAD
9:45a
SEA
7:38p
9h 53m
1 stop
SEA
6:20p
IAD
3:13a
8h 53m
1 stop
Depart: Mon Sep 25 2017 Return: Thu Sep 28 2017 Trip spans 4 days
Delta
Delta
IAD
12:59p
SEA
8:33p
7h 34m
1 stop
SEA
7:40a
IAD
3:59p
8h 19m
1 stop
Depart: Tue Sep 5 2017 Return: Sat Sep 9 2017 Trip spans 5 days
Frontier
Frontier
IAD
2:40p
SEA
8:57a
18h 17m
1 stop
SEA
2:40p
IAD
10:21p
7h 41m
1 stop
Depart: Thu Sep 7 2017 Return: Tue Sep 12 2017 Trip spans 6 days
American Airlines
American Airlines
IAD
9:45a
SEA
7:38p
9h 53m
1 stop
SEA
8:15p
IAD
4:00a
7h 45m
1 stop
Depart: Wed Sep 6 2017 Return: Sat Sep 9 2017 Trip spans 4 days
Frontier
Frontier
IAD
2:40p
SEA
9:02a
18h 22m
1 stop
SEA
2:40p
IAD
10:21p
7h 41m
1 stop
Depart: Wed Nov 15 2017 Return: Mon Dec 4 2017 Trip spans 20 days
United
United
IAD
7:30a
SEA
1:09p
5h 39m
nonstop
SEA
7:50a
IAD
12:38p
4h 48m
nonstop
Depart: Sun Nov 12 2017 Return: Tue Nov 14 2017 Trip spans 3 days
Alaska Airlines
Alaska Airlines
IAD
4:05a
SEA
10:02a
5h 57m
nonstop
SEA
1:55p
IAD
11:28p
9h 33m
1 stop
Depart: Sat Aug 19 2017 Return: Mon Aug 28 2017 Trip spans 10 days
American Airlines
American Airlines
IAD
3:05p
SEA
11:35p
8h 30m
1 stop
SEA
8:15p
IAD
4:00a
7h 45m
1 stop
Depart: Sat Sep 9 2017 Return: Sat Sep 16 2017 Trip spans 8 days
Frontier
Frontier
IAD
2:45p
SEA
9:02a
18h 17m
1 stop
SEA
2:40p
IAD
10:21p
7h 41m
1 stop
Depart: Wed Nov 22 2017 Return: Wed Nov 29 2017 Trip spans 8 days
United
United
IAD
12:50p
SEA
6:25p
5h 35m
nonstop
SEA
7:50a
IAD
12:38p
4h 48m
nonstop
Depart: Tue Nov 21 2017 Return: Wed Nov 29 2017 Trip spans 9 days
Alaska Airlines
Alaska Airlines
IAD
4:05a
SEA
10:02a
5h 57m
nonstop
SEA
4:40p
IAD
6:48a
14h 08m
1 stop
Depart: Thu Jul 27 2017 Return: Tue Aug 1 2017 Trip spans 6 days
Delta
Delta
IAD
8:55a
SEA
4:34p
7h 39m
1 stop
SEA
9:25a
IAD
5:01p
7h 36m
1 stop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

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.

We compile tonnes of data for you
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.

If you have more questions or if you have a bad price to report to us,
please send us an email and someone from our team will get back to you promptly.

Airports
Origin

Washington
$284
Destination

Seattle
$284
Airlines Airline reviews

102 travelers who booked a flight from Washington to Seattle rated their chosen airlines with an average of 7.3.

Overall
7.5
Boarding
7.8
Crew
7.9
Comfort
7.2
Food
6.6
Entertainment
6.3