Cheap flights from Seattle to Barcelona, Spain for only $362 roundtrip with Alaska Airlines and TAP Air Portugal.
The example dates listed below range between $362 and $399 roundtrip.
Availability from November 2020 to April 2021 (excluding Christmas/New Year)
28th Jan – 4th Feb
28th Jan – 5th Feb
30th Jan – 7th Feb
24th Feb – 4th Mar
TAP Air Portugal