AirHint found the following cheapest return flights from Seattle (SEA) to Barcelona (BCN) in May 2026 (see full year).

Return flights

05 May - 12 May	Air Canada
06 May - 13 May	Air Canada
12 May - 19 May	Air Canada
11 May - 18 May	Air Canada
13 May - 20 May	Air Canada
03 May - 10 May	Air Canada
04 May - 11 May	Air Canada
10 May - 17 May	Air Canada
15 May - 22 May	Lufthansa
14 May - 21 May	Air Canada

Also check the deals for one-way flights from Seattle to Barcelona in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Seattle to Barcelona in May from 446€

Return flights