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

Return flights

03 Dec - 17 Dec	Scandinavian Airlines
08 Dec - 12 Dec	Scandinavian Airlines
04 Dec - 11 Dec	Icelandair
08 Dec - 10 Jan	Scandinavian Airlines
10 Dec - 10 Jan	Scandinavian Airlines
03 Dec - 17 Dec	United	direct
05 Dec - 10 Jan	TAP
14 Dec - 21 Dec	United
05 Dec - 10 Jan	United	direct
24 Dec - 31 Dec	United	direct
08 Dec - 10 Jan	Brussels Airlines	direct
10 Dec - 10 Jan	Brussels Airlines	direct
08 Dec - 12 Dec	Brussels Airlines	direct

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

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.

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Cheapest return flights from Washington to Brussels in December from 354€

Return flights