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

Return flights

28 Sep - 06 Oct	Air Transat	direct
23 Sep - 08 Oct	Air Canada	direct
28 Sep - 17 Oct	Air Transat	direct
30 Sep - 08 Oct	Air Canada
23 Sep - 29 Sep	Lufthansa
25 Sep - 29 Sep	Air Canada
25 Sep - 30 Sep	Air Canada
23 Sep - 30 Sep	Air Canada
23 Sep - 28 Sep	Air Canada
28 Sep - 05 Oct	Air Canada
25 Sep - 02 Oct	Air Canada	direct
30 Sep - 07 Oct	Air Canada
25 Sep - 05 Oct	Air Canada	direct
24 Sep - 01 Oct	Air Canada
23 Sep - 02 Oct	Brussels Airlines
26 Sep - 30 Sep	Air Canada
19 Sep - 26 Sep	KLM
23 Sep - 30 Sep	Lufthansa	direct
25 Sep - 30 Sep	Air Canada	direct
19 Sep - 22 Sep	Delta

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

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

Cheapest return flights from Montreal to Brussels in September from $437

Return flights