Cheapest return flights from Seattle to Barcelona in December from 355€

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

Return flights

03 Dec - 09 Dec Icelandair
06 Dec - 13 Dec Lufthansa
05 Dec - 12 Dec British Airways
05 Dec - 14 Dec Air France
11 Dec - 18 Dec United
04 Dec - 07 Dec SWISS
07 Dec - 14 Dec Icelandair
07 Dec - 27 Dec Frontier Airlines
27 Dec - 04 Jan Alaska Airlines
07 Dec - 06 Jan Delta
26 Dec - 04 Jan Hawaiian Airlines
22 Dec - 29 Dec Frontier Airlines
19 Dec - 28 Dec WestJet
14 Dec - 03 Jan Hawaiian Airlines

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

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