Cheapest return flights from Seattle to Brussels in December from 583€

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

Return flights

10 Dec - 30 Jan Brussels Airlines
10 Dec - 17 Dec United

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.