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

Return flights

29 Sep - 06 Oct	FrenchBee
24 Sep - 01 Oct	FrenchBee
28 Sep - 05 Oct	FrenchBee
22 Sep - 29 Sep	FrenchBee
17 Sep - 22 Sep	FrenchBee
19 Sep - 26 Sep	KLM
26 Sep - 03 Oct	KLM
30 Sep - 07 Oct	Air Transat
25 Sep - 02 Oct	Air France
23 Sep - 30 Sep	SWISS
21 Sep - 28 Sep	Air France
21 Sep - 11 Oct	FrenchBee
17 Sep - 11 Oct	FrenchBee
27 Sep - 04 Oct	KLM
25 Sep - 30 Sep	SWISS
18 Sep - 11 Oct	Air Transat

Also check the deals for one-way flights from Montreal to Prague 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 Prague in September from 498€

Return flights