Cheapest return flights from Seattle to Barcelona in September from $572

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

Return flights

01 Sep - 09 Sep Condor
15 Sep - 14 Oct Turkish Airlines
11 Sep - 25 Sep Scandinavian Airlines
04 Sep - 11 Sep Condor
08 Sep - 15 Sep Turkish Airlines
07 Sep - 14 Sep Turkish Airlines
05 Sep - 12 Sep Condor
06 Sep - 13 Sep Condor
01 Sep - 09 Sep Air France direct
15 Sep - 14 Oct Air France direct
15 Sep - 30 Sep Air France direct

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

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