Cheapest return flights from Seattle to Barcelona in December from $613

Best time to book flights for Seattle (SEA) to Barcelona (BCN) flights at AirHint

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

Return flights

02 Dec - 09 Dec United
31 Dec - 08 Jan British Airways
12 Dec - 25 Dec Air Canada
29 Dec - 06 Jan United
12 Dec - 19 Dec United
31 Dec - 07 Jan United
30 Dec - 06 Jan United
30 Dec - 07 Jan British Airways
28 Dec - 05 Jan Lufthansa
29 Dec - 05 Jan Lufthansa
26 Dec - 02 Jan Lufthansa
25 Dec - 02 Jan United
25 Dec - 01 Jan Lufthansa
22 Dec - 29 Dec United

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

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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