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

Return flights

22 Sep - 27 Oct	FrenchBee
18 Sep - 02 Oct	Air Canada
18 Sep - 25 Sep	Japan Airlines
25 Sep - 02 Oct	Japan Airlines
24 Sep - 01 Oct	Japan Airlines
30 Sep - 06 Oct	WestJet
29 Sep - 06 Oct	FrenchBee
29 Sep - 31 Oct	FrenchBee
28 Sep - 05 Oct	FrenchBee
22 Sep - 29 Sep	FrenchBee
27 Sep - 04 Oct	Air Transat
30 Sep - 07 Oct	WestJet
23 Sep - 30 Sep	Porter Airlines (Canada) Ltd
20 Sep - 27 Sep	Cathay Pacific
21 Sep - 28 Sep	EVA Air

Also check the deals for one-way flights from Montreal to Jakarta 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 Jakarta in September from $1106

Return flights