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

Return flights

01 May - 08 May	Icelandair
01 May - 06 May	Icelandair
01 May - 09 May	Icelandair
08 May - 15 May	Icelandair
07 May - 15 May	Icelandair
01 May - 10 May	Icelandair
04 May - 11 May	Icelandair
05 May - 26 May	Icelandair
09 May - 21 May	Condor
10 May - 17 May	Icelandair
22 May - 06 Jun	Finnair
25 May - 02 Jun	Condor
25 May - 05 Jun	Icelandair
18 May - 29 Jun	Aer Lingus
19 May - 30 Jun	Icelandair
25 May - 01 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 365€

Return flights