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

Return flights

09 May - 16 May	Icelandair
08 May - 15 May	Icelandair
02 May - 10 May	Icelandair
11 May - 18 May	Icelandair
12 May - 19 May	Icelandair
10 May - 17 May	Condor
05 May - 26 May	Condor
07 May - 14 May	Condor
14 May - 25 May	Scandinavian Airlines
13 May - 06 Jun	Condor
16 May - 30 May	Icelandair
27 May - 10 Jun	Condor
29 May - 07 Jun	Condor
23 May - 07 Jun	Condor
23 May - 07 Jun	Air France	direct

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 323€

Return flights