Cheapest return flights from Washington to Brussels in September from $475

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

23 Sep - 30 Sep Scandinavian Airlines
02 Sep - 09 Sep Scandinavian Airlines
19 Sep - 24 Sep Scandinavian Airlines
19 Sep - 24 Sep Brussels Airlines direct

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

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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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