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

Return flights

05 May - 26 May	Condor
06 May - 17 May	Condor
14 May - 25 May	Scandinavian Airlines
19 May - 26 May	Condor
19 May - 25 May	Condor
01 May - 10 May	Condor
16 May - 30 May	Condor
26 May - 08 Jun	Condor
30 May - 09 Jun	Condor
04 May - 11 May	Icelandair
09 May - 16 May	Icelandair
14 May - 21 May	Icelandair
29 May - 05 Jun	Icelandair

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 454€

Return flights