Cheapest one-way flights from Seattle to Barcelona in October from $238

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

One-Way flights

17 Oct WestJet
29 Oct Alaska Airlines
04 Oct Frontier Airlines
08 Oct Frontier Airlines
23 Oct Hawaiian Airlines
07 Oct WestJet
05 Oct Alaska Airlines
06 Oct Alaska Airlines
13 Oct Frontier Airlines
30 Oct Air Canada

Also check the deals for return flights from Seattle to Barcelona in October.

Skyscanner

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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