Cheapest return flights from Seattle to Brussels in December from 430€

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

Return flights

10 Dec - 17 Dec United
14 Dec - 26 Dec United
06 Dec - 18 Dec Delta
16 Dec - 27 Dec KLM
17 Dec - 10 Jan Alaska Airlines
11 Dec - 04 Jan Lufthansa
27 Dec - 03 Jan British Airways
19 Dec - 04 Jan Icelandair
17 Dec - 04 Jan WestJet
18 Dec - 04 Jan Alaska Airlines
19 Dec - 29 Dec WestJet
20 Dec - 04 Jan Sun Country Airlines

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

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