Cheapest return flights from Seattle to Brussels in December from $656

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

Return flights

10 Dec - 15 Dec Delta
06 Dec - 18 Dec Delta
31 Dec - 07 Jan United
30 Dec - 06 Jan Air Canada
29 Dec - 04 Jan Lufthansa
21 Dec - 10 Jan Sun Country Airlines
20 Dec - 10 Jan Alaska Airlines
22 Dec - 31 Dec Sun Country Airlines

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

Powered by

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.

Book a cheap hotel in Brussels

Cheap car rent in Brussels

Feel free to contact us with any feedback or request another flight research.