Cheapest return flights from Seattle to Madrid in December from 369€

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

Return flights

31 Dec - 21 Jan Air France
02 Dec - 12 Dec British Airways
08 Dec - 25 Dec Air France
29 Dec - 12 Jan Air France
03 Dec - 10 Dec Iberia
09 Dec - 16 Dec Iberia
01 Dec - 08 Dec Iberia
25 Dec - 17 Jan KLM
05 Dec - 12 Dec Iberia
07 Dec - 14 Dec Iberia
13 Dec - 22 Dec United
12 Dec - 19 Dec United
11 Dec - 18 Dec Iberia
23 Dec - 08 Jan Frontier Airlines
23 Dec - 07 Jan Frontier Airlines
22 Dec - 07 Jan Frontier Airlines
19 Dec - 10 Jan Icelandair
29 Dec - 06 Jan Lufthansa
31 Dec - 07 Jan Iberia
29 Dec - 05 Jan Iberia

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

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