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

Return flights

02 May - 11 May	Icelandair
04 May - 12 May	Condor
05 May - 13 May	Condor
06 May - 14 May	Condor
12 May - 20 May	Condor
10 May - 18 May	Condor
13 May - 21 May	Condor
12 May - 22 May	Condor
17 May - 25 May	Scandinavian Airlines
05 May - 26 May	Condor
25 May - 02 Jun	Condor
26 May - 03 Jun	Condor
17 May - 04 Jun	Condor
27 May - 04 Jun	Condor
20 May - 13 Jun	Condor
28 May - 11 Jun	Condor
28 May - 05 Jun	Condor
14 May - 06 Jun	Icelandair
31 May - 08 Jun	Condor
16 May - 06 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 402€

Return flights