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

Return flights

28 Aug - 03 Sep	WestJet
19 Aug - 10 Sep	Air Transat	direct
25 Aug - 31 Aug	Delta
26 Aug - 02 Sep	Air Transat
04 Aug - 04 Sep	Air Transat
21 Aug - 28 Aug	WestJet
13 Aug - 27 Aug	Air Transat
10 Aug - 24 Aug	WestJet
01 Aug - 15 Aug	WestJet
20 Aug - 27 Aug	Air Transat
10 Aug - 19 Aug	Porter Airlines (Canada) Ltd
23 Aug - 29 Aug	Air Transat
19 Aug - 26 Aug	Air Transat
04 Aug - 19 Aug	Air Transat
27 Aug - 04 Sep	Air Transat
28 Aug - 03 Sep	Air Transat	direct
04 Aug - 04 Sep	Air Canada	direct
26 Aug - 02 Sep	Air Canada	direct
27 Aug - 04 Sep	Air Canada	direct
27 Aug - 17 Sep	Delta

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

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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Cheapest return flights from Montreal to Brussels in August from $605

Return flights