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

Return flights

02 Dec - 06 Dec	Scandinavian Airlines
29 Dec - 21 Jan	United
26 Dec - 17 Jan	Air Canada
16 Dec - 11 Jan	Air Canada
16 Dec - 10 Jan	Air Canada
17 Dec - 08 Jan	Icelandair
18 Dec - 11 Jan	Scandinavian Airlines
17 Dec - 11 Jan	Icelandair
19 Dec - 11 Jan	Icelandair
17 Dec - 10 Jan	Air Canada
19 Dec - 10 Jan	United
22 Dec - 27 Dec	British Airways

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 $571

Return flights