Seattle / Tacoma (SEA) to Lisbon (LIS) flight deal in economy from $740

Tuesday, August 4th, 2026

7 round-trip options

Returning
Sun, Aug 9, 20265 Day Trip
$1,106 USD
Returning
Mon, Aug 10, 20266 Day Trip
$958 USD
Returning
Wed, Aug 12, 20268 Day Trip
$974 USD
Returning
Fri, Aug 14, 202610 Day Trip
$974 USD
Returning
Sat, Aug 15, 202611 Day Trip
$1,044 USD
Returning
Sun, Aug 16, 202612 Day Trip
$1,106 USD
Returning
Mon, Aug 17, 202613 Day Trip
$958 USD