Cheapest return flights from Washington to Brussels in September from $447

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

Return flights

22 Sep - 08 Oct Scandinavian Airlines
10 Sep - 24 Sep Scandinavian Airlines
11 Sep - 15 Sep Scandinavian Airlines
03 Sep - 10 Sep Scandinavian Airlines
19 Sep - 24 Sep Scandinavian Airlines
12 Sep - 04 Oct Scandinavian Airlines
12 Sep - 16 Sep Scandinavian Airlines
05 Sep - 12 Sep Icelandair
07 Sep - 14 Sep Icelandair
09 Sep - 16 Sep Icelandair
11 Sep - 18 Sep Icelandair
03 Sep - 10 Sep Brussels Airlines direct
30 Sep - 07 Oct United
22 Sep - 08 Oct United direct
12 Sep - 04 Oct United direct
27 Sep - 04 Oct United

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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