AirHint found the following cheapest return flights from Seattle (SEA) to Barcelona (BCN) in October 2025 (see full year).

Return flights

12 Oct - 22 Oct	Air Canada
13 Oct - 22 Oct	Air Canada
22 Oct - 29 Oct	Air Canada
21 Oct - 28 Oct	Air Canada
08 Oct - 15 Oct	Lufthansa
07 Oct - 14 Oct	Air Canada
14 Oct - 21 Oct	Air Canada
20 Oct - 27 Oct	Air Canada
29 Oct - 05 Nov	Air Canada
15 Oct - 22 Oct	Air Canada
21 Oct - 04 Nov	Air Canada
28 Oct - 04 Nov	Air Canada
06 Oct - 13 Oct	Air Canada
30 Oct - 06 Nov	Air Canada
29 Oct - 13 Nov	Lufthansa
28 Oct - 15 Nov	Air Canada
27 Oct - 03 Nov	Air Canada
31 Oct - 07 Nov	Air Canada
25 Oct - 15 Nov	Air Canada
26 Oct - 15 Nov	Air Canada

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

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 October from $425

Return flights