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

Return flights

10 Sep - 18 Sep	Icelandair
03 Sep - 16 Sep	Icelandair
23 Sep - 29 Sep	Icelandair
22 Sep - 29 Sep	Icelandair
07 Sep - 21 Sep	Icelandair
08 Sep - 15 Sep	Icelandair
10 Sep - 17 Sep	Icelandair
15 Sep - 24 Sep	Air Transat
25 Sep - 13 Oct	Air Transat
28 Sep - 13 Oct	Air Transat
29 Sep - 13 Oct	Air Transat
22 Sep - 06 Oct	Air Transat
24 Sep - 01 Oct	Air Transat
22 Sep - 17 Oct	Air Transat
22 Sep - 10 Oct	Air Transat
27 Sep - 12 Oct	Aer Lingus
27 Sep - 11 Oct	Aer Lingus
30 Sep - 14 Oct	Aer Lingus
03 Sep - 09 Sep	Porter Airlines (Canada) Ltd
15 Sep - 25 Sep	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Toronto 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.

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Cheapest return flights from Toronto to Brussels in September from $397

Return flights