Cheapest return flights from Washington to Brussels in September from $570

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 Air Canada
24 Sep - 01 Oct Turkish Airlines
25 Sep - 02 Oct Turkish Airlines
28 Sep - 02 Oct TAP
20 Sep - 11 Oct SWISS
28 Sep - 02 Oct United direct
23 Sep - 30 Sep United direct
20 Sep - 11 Oct Brussels Airlines direct
22 Sep - 29 Sep Brussels Airlines direct
24 Sep - 01 Oct 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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