Seattle / Tacoma (SEA) to Washington (IAD) flight deal in economy from $148

ASAlaska Airlines, Inc.

One Way•Economy

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

IAD

Washington Dulles International Airport

Washington, United States

$260 USD

-43%$148 USD

Verified 17 days ago

August 2026

Today

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27$27928$26329$25830$31731$2791$3992$3293$2634$1985$2796$2637$2798$4649$49910$20311$19812$21313$19814$25815$38416$38417$27918$21319$27920$33421$21322$21323$38424$22725$18326$17627$18828$18829$21330$20331$1881$1832$1833$1884$1885$1936$213

Extremely Rare Availability

3% of dates checked are available within 10% of the lowest price

Monday, August 24th, 2026

Outbound Flights

5h 5m·Nonstop

$227 USD

SEAAug 24 21:35

→

IADAug 25 05:40

AS 367Boeing 737

9h 27m·1 stop

$253 USD

SEAAug 24 06:00

→

DFWAug 24 11:59

AS 414Boeing 737

2h 26m layover

DFWAug 24 14:25

→

IADAug 24 18:27

AA 1863Boeing 737

5h 6m·Nonstop

$339 USD

SEAAug 24 08:38

→

IADAug 24 16:44

AS 737Boeing 737MAX 9 Passenger

5h 3m·Nonstop

$339 USD

SEAAug 24 15:56

→

IADAug 24 23:59

AS 675Boeing 737MAX 9 Passenger

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