Seattle / Tacoma (SEA) to Boston (BOS) flight deal in economy from $297

Monday, July 20th, 2026

10 round-trip options

Returning
Sat, Jul 25, 20265 Day Trip
$510 USD
Returning
Sun, Jul 26, 20266 Day Trip
$517 USD
Returning
Mon, Jul 27, 20267 Day Trip
$397 USD
Returning
Tue, Jul 28, 20268 Day Trip
$397 USD
Returning
Wed, Jul 29, 20269 Day Trip
$412 USD
Returning
Thu, Jul 30, 202610 Day Trip
$462 USD
Returning
Fri, Jul 31, 202611 Day Trip
$517 USD
Returning
Sat, Aug 1, 202612 Day Trip
$602 USD
Returning
Sun, Aug 2, 202613 Day Trip
$605 USD
Returning
Mon, Aug 3, 202614 Day Trip
$462 USD