Cheapest return SEA–BCN flights, September

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

Return flights

07 Sep - 14 Sep Condor
14 Sep - 21 Sep Condor
16 Sep - 23 Sep Condor
16 Sep - 22 Sep Condor
18 Sep - 01 Oct Condor
02 Sep - 09 Sep Condor
03 Sep - 10 Sep Condor
18 Sep - 30 Sep Icelandair
26 Sep - 10 Oct Icelandair
19 Sep - 02 Oct Iberia
17 Sep - 24 Sep Aer Lingus
17 Sep - 22 Sep Condor
01 Sep - 17 Sep Condor
27 Sep - 10 Oct Aer Lingus
19 Sep - 02 Oct Air France direct

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

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