-->
Skip to content

United flights from Washington, D.C. to Seattle starting at

Select journey type

Enter to select travel class and passengers

Book with confidence with United

More United deals on Washington, D.C. (IAD) to Seattle (SEA) flights

FromToDatesFare TypePrice

Washington, D.C. (IAD)

Seattle (SEA)

Depart: 08/18/20

Return: 08/25/20

Roundtrip
from
$149*
Viewed:1dayago

Washington, D.C. (IAD)

Seattle (SEA)

Depart: 08/18/20

Return: 09/01/20

Roundtrip
from
$149*
Viewed:1dayago

Washington, D.C. (IAD)

Seattle (SEA)

Depart: 09/23/20

Return: 09/30/20

Roundtrip
from
$149*
Viewed:17hoursago

Washington, D.C. (IAD)

Seattle (SEA)

Depart: 09/24/20

Return: 10/01/20

Roundtrip
from
$149*
Viewed:17hoursago

Washington, D.C. (IAD)

Seattle (SEA)

Depart: 10/05/20

Return: 10/12/20

Roundtrip
from
$149*
Viewed:17hoursago

Washington, D.C. (IAD)

Seattle (SEA)

Depart: 10/06/20

Return: 10/13/20

Roundtrip
from
$149*
Viewed:17hoursago

Washington, D.C. (IAD)

Seattle (SEA)

Depart: 10/07/20

Return: 10/14/20

Roundtrip
from
$149*
Viewed:17hoursago

Washington, D.C. (IAD)

Seattle (SEA)

Depart: 10/08/20

Return: 10/15/20

Roundtrip
from
$149*
Viewed:17hoursago

Washington, D.C. (IAD)

Seattle (SEA)

Depart: 11/02/20

Return: 11/09/20

Roundtrip
from
$149*
Viewed:17hoursago

Washington, D.C. (IAD)

Seattle (SEA)

Depart: 11/09/20

Return: 11/16/20

Roundtrip
from
$149*
Viewed:17hoursago

*Prices have been available for round trips within the last 48 hours and may not be currently available. Fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply.

Weather in Seattle

Wednesday broken clouds
67°F 08/12/20
Thursday sky is clear
75°F 08/13/20
Friday sky is clear
74°F 08/14/20
Saturday sky is clear
79°F 08/15/20
Sunday light rain
87°F 08/16/20
Monday sky is clear
83°F 08/17/20
Tuesday light rain
77°F 08/18/20
Powered by: OpenWeatherMap.org