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

Return flights

03 Sep - 24 Sep	FrenchBee
10 Sep - 17 Sep	FrenchBee
15 Sep - 22 Sep	FrenchBee
17 Sep - 24 Sep	Air Transat
29 Sep - 06 Oct	FrenchBee
22 Sep - 29 Sep	FrenchBee
02 Sep - 09 Sep	Porter Airlines (Canada) Ltd
21 Sep - 28 Sep	WestJet
09 Sep - 16 Sep	Air Transat
16 Sep - 23 Sep	Air Transat
01 Sep - 08 Sep	FrenchBee
15 Sep - 01 Oct	FrenchBee
24 Sep - 01 Oct	British Airways
25 Sep - 02 Oct	Air Transat
28 Sep - 05 Oct	WestJet
30 Sep - 07 Oct	Air France
28 Sep - 31 Oct	Air France
27 Sep - 04 Oct	KLM
26 Sep - 03 Oct	KLM
01 Sep - 01 Oct	Lufthansa

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.

Book a cheap hotel in Warsaw

Cheap car rent in Warsaw

Cheapest return flights from Montreal to Warsaw in September from 522€

Return flights