Cheapest return flights from Seattle to Madrid in December from 580€

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

Return flights

08 Dec - 15 Dec United
09 Dec - 16 Dec British Airways
09 Dec - 15 Dec British Airways
10 Dec - 17 Dec Aer Lingus
11 Dec - 31 Dec Alaska Airlines
26 Dec - 05 Jan Icelandair
23 Dec - 01 Jan Lufthansa
07 Dec - 02 Jan Icelandair
19 Dec - 21 Dec Turkish Airlines
29 Dec - 06 Jan Lufthansa
30 Dec - 06 Jan Iberia
28 Dec - 04 Jan Iberia
26 Dec - 02 Jan Iberia

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

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