Cheapest return flights from Seattle to Barcelona in December from $441

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

Return flights

08 Dec - 15 Dec SWISS
04 Dec - 12 Dec SWISS
08 Dec - 16 Dec SWISS
09 Dec - 16 Dec SWISS
06 Dec - 14 Dec SWISS
10 Dec - 16 Dec Air Canada
05 Dec - 13 Dec United
07 Dec - 15 Dec United
10 Dec - 18 Dec United
10 Dec - 17 Dec Air Canada
28 Dec - 17 Jan Alaska Airlines
15 Dec - 10 Jan Icelandair
16 Dec - 10 Jan Hawaiian Airlines
07 Dec - 06 Jan Air Canada
30 Dec - 04 Jan WestJet

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

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