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

Return flights

17 Sep - 24 Sep	FrenchBee
10 Sep - 17 Sep	Porter Airlines (Canada) Ltd
22 Sep - 08 Oct	FrenchBee
11 Sep - 18 Sep	Air Transat
07 Sep - 10 Sep	Porter Airlines (Canada) Ltd
15 Sep - 22 Sep	FrenchBee
29 Sep - 06 Oct	FrenchBee
08 Sep - 15 Sep	FrenchBee
02 Sep - 09 Sep	Porter Airlines (Canada) Ltd
22 Sep - 15 Oct	FrenchBee
18 Sep - 25 Sep	Air Transat
01 Sep - 30 Sep	FrenchBee
01 Sep - 22 Sep	Air Transat
28 Sep - 05 Oct	WestJet
21 Sep - 15 Oct	SWISS
18 Sep - 15 Oct	SWISS
24 Sep - 01 Oct	British Airways
30 Sep - 07 Oct	Air Canada
27 Sep - 04 Oct	WestJet
25 Sep - 02 Oct	Air Canada

Also check the deals for one-way flights from Montreal to Warsaw 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 Warsaw in September from $630

Return flights