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

Return flights

28 Apr - 05 May	Air Canada
29 Apr - 06 May	Air Canada
27 Apr - 04 May	Air Canada
30 Apr - 07 May	Air Canada
21 Apr - 28 Apr	Air Canada
26 Apr - 03 May	Air Canada
27 Apr - 23 May	Air Canada
24 Apr - 01 May	Air Canada
25 Apr - 02 May	Air Canada
01 Apr - 25 Apr	Icelandair
02 Apr - 09 Apr	Turkish Airlines
15 Apr - 22 Apr	Icelandair

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

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 April from 401€

Return flights