Cheapest return flights from Washington to Brussels in September from $445

Best time to book flights for Washington (IAD) to Brussels (BRU) flights at AirHint

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

Return flights

14 Sep - 30 Sep Scandinavian Airlines
08 Sep - 15 Sep Icelandair
18 Sep - 25 Sep Icelandair
28 Sep - 05 Oct Icelandair
02 Sep - 09 Sep United direct
08 Sep - 15 Sep United direct
18 Sep - 25 Sep United direct
28 Sep - 05 Oct United direct
14 Sep - 30 Sep Brussels Airlines direct

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

Skyscanner

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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