Seattle / Tacoma (SEA) to Washington (IAD) flight deal in economy from $255

Wednesday, December 23rd, 2026

7 round-trip options

Returning
Mon, Dec 28, 20265 Day Trip
$592 USD
Returning
Wed, Dec 30, 20267 Day Trip
$592 USD
Returning
Sat, Jan 2, 202710 Day Trip
$592 USD
Returning
Sun, Jan 3, 202711 Day Trip
$592 USD
Returning
Mon, Jan 4, 202712 Day Trip
$507 USD
Returning
Tue, Jan 5, 202713 Day Trip
$497 USD
Returning
Wed, Jan 6, 202714 Day Trip
$497 USD