Cheapest return flights from Seattle to Madrid in December from 389€

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

Return flights

08 Dec - 25 Dec Delta
29 Dec - 12 Jan Air France
03 Dec - 10 Dec Iberia
07 Dec - 14 Dec Iberia
29 Dec - 24 Jan Air France
01 Dec - 08 Dec Iberia
24 Dec - 17 Jan British Airways
05 Dec - 12 Dec Iberia
28 Dec - 17 Jan Lufthansa
09 Dec - 16 Dec Iberia
11 Dec - 22 Dec United
12 Dec - 23 Dec United
11 Dec - 18 Dec Iberia
09 Dec - 30 Dec British Airways
23 Dec - 08 Jan British Airways
29 Dec - 06 Jan Lufthansa
23 Dec - 07 Jan British Airways
22 Dec - 07 Jan Turkish Airlines
13 Dec - 02 Jan Delta
29 Dec - 05 Jan Iberia

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

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