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

Return flights

10 Dec - 31 Jan	Scandinavian Airlines
08 Dec - 11 Dec	Scandinavian Airlines
31 Dec - 10 Jan	Scandinavian Airlines
07 Dec - 12 Dec	jetBlue
07 Dec - 16 Dec	jetBlue
28 Dec - 13 Jan	Air Canada
29 Dec - 21 Jan	jetBlue
29 Dec - 06 Jan	Delta
13 Dec - 29 Dec	jetBlue
16 Dec - 10 Jan	jetBlue
24 Dec - 04 Jan	Air Canada
01 Dec - 02 Jan	Air Canada
04 Dec - 02 Jan	Air Canada
19 Dec - 26 Dec	Delta
04 Dec - 03 Jan	Air Canada
15 Dec - 30 Dec	British Airways
15 Dec - 29 Dec	British Airways
15 Dec - 27 Dec	British Airways
21 Dec - 26 Dec	TAP

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 $488

Return flights