Cheapest one-way flights from Washington to Brussels in December from $278

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

One-Way flights

08 Dec TAP
31 Dec TAP
15 Dec TAP
04 Dec TAP
23 Dec Frontier Airlines
21 Dec Aer Lingus
18 Dec Aer Lingus
15 Dec Austrian Airlines direct
20 Dec Aer Lingus
08 Dec United direct

Also check the deals for return flights from Washington to Brussels in December.

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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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