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

Return flights

23 Sep - 30 Sep	Porter Airlines (Canada) Ltd
30 Sep - 07 Oct	Porter Airlines (Canada) Ltd
15 Sep - 22 Sep	FrenchBee
29 Sep - 06 Oct	FrenchBee
14 Sep - 21 Sep	FrenchBee
11 Sep - 22 Sep	Air Transat
16 Sep - 23 Sep	Air Transat
16 Sep - 30 Sep	Air Transat
26 Sep - 03 Oct	FrenchBee
28 Sep - 05 Oct	Air Transat
10 Sep - 17 Sep	FrenchBee
22 Sep - 29 Sep	Air Transat
11 Sep - 18 Sep	Air Transat
24 Sep - 01 Oct	WestJet
09 Sep - 16 Sep	Air Transat
25 Sep - 02 Oct	Air Transat
18 Sep - 03 Oct	Air Transat
20 Sep - 11 Oct	Air Transat
27 Sep - 04 Oct	Air Transat

Also check the deals for one-way flights from Montreal to Belgrade 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 Montreal to Belgrade in September from $668

Return flights