Cheapest return flights from Washington to Brussels in September from $577

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

11 Sep - 18 Sep Icelandair
02 Sep - 09 Sep Icelandair
07 Sep - 14 Sep Icelandair
12 Sep - 19 Sep Icelandair
27 Sep - 04 Oct Icelandair
17 Sep - 24 Sep Icelandair
02 Sep - 09 Sep United direct
12 Sep - 19 Sep United direct
07 Sep - 14 Sep United direct
22 Sep - 29 Sep United 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.

Book a cheap hotel in Brussels

Cheap car rent in Brussels