Cheapest return flights from Seattle to Barcelona in September from 445€

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

Return flights

09 Sep - 16 Sep Air Canada
05 Sep - 12 Sep Icelandair
24 Sep - 01 Oct Scandinavian Airlines
08 Sep - 15 Sep Scandinavian Airlines
05 Sep - 18 Sep Scandinavian Airlines
30 Sep - 07 Oct Aer Lingus
03 Sep - 10 Sep Aer Lingus
17 Sep - 24 Sep Aer Lingus
01 Sep - 08 Sep Icelandair
06 Sep - 13 Sep Icelandair
29 Sep - 06 Oct Aer Lingus
23 Sep - 30 Sep American Airlines
26 Sep - 03 Oct Scandinavian Airlines
02 Sep - 09 Sep Icelandair
28 Sep - 05 Oct Icelandair
25 Sep - 02 Oct Scandinavian Airlines
21 Sep - 04 Oct British Airways
27 Sep - 04 Oct Icelandair

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

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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