Washington to Seattle
IADSEA
Fly from Washington to Seattle starting at USD 145 with United Airlines.
Best fare available on Oct 1, 2026.
Limited seats. Better plans. Book before it's gone.
Washington to Seattle cheapest flights this week
Washington to Seattle monthly flight fare trend
Sep
from USD 280
Oct
from USD 145
Nov
from USD 133
Dec
from USD 274
Jan
from USD 216
Feb
from USD 243
Airport Details
Origin
Washington
Washington Dulles International Airport (IAD)
Dulles, IAD
Zone
New York
Elev
312 ft
Destination
Seattle
Seattle–Tacoma International Airport (SEA)
Seattle, SEA
Zone
Los Angeles
Elev
433 ft
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