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

Return flights

15 Sep - 22 Sep	FrenchBee
03 Sep - 10 Sep	FrenchBee
01 Sep - 22 Sep	FrenchBee
28 Sep - 05 Oct	FrenchBee
15 Sep - 26 Sep	FrenchBee
17 Sep - 24 Sep	Air Transat
15 Sep - 01 Oct	FrenchBee
27 Sep - 04 Oct	Air Transat
09 Sep - 16 Sep	Air Transat
02 Sep - 09 Sep	Porter Airlines (Canada) Ltd
01 Sep - 08 Sep	FrenchBee
16 Sep - 23 Sep	Porter Airlines (Canada) Ltd
18 Sep - 25 Sep	Air Transat
30 Sep - 07 Oct	Condor
25 Sep - 02 Oct	Porter Airlines (Canada) Ltd
14 Sep - 06 Oct	KLM
25 Sep - 18 Oct	Air Canada

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 477€

Return flights