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

Monday, December 21st, 2026

7 round-trip options

Returning
Sat, Dec 26, 20265 Day Trip
$697 USD
Returning
Mon, Dec 28, 20267 Day Trip
$637 USD
Returning
Thu, Dec 31, 202610 Day Trip
$592 USD
Returning
Fri, Jan 1, 202711 Day Trip
$637 USD
Returning
Sat, Jan 2, 202712 Day Trip
$637 USD
Returning
Sun, Jan 3, 202713 Day Trip
$637 USD
Returning
Mon, Jan 4, 202714 Day Trip
$552 USD