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

Saturday, December 19th, 2026

7 round-trip options

Returning
Thu, Dec 24, 20265 Day Trip
$802 USD
Returning
Sat, Dec 26, 20267 Day Trip
$947 USD
Returning
Tue, Dec 29, 202610 Day Trip
$887 USD
Returning
Wed, Dec 30, 202611 Day Trip
$887 USD
Returning
Thu, Dec 31, 202612 Day Trip
$842 USD
Returning
Fri, Jan 1, 202713 Day Trip
$887 USD
Returning
Sat, Jan 2, 202714 Day Trip
$887 USD