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

Return flights

30 Sep - 21 Oct	Condor
28 Sep - 05 Oct	FrenchBee
29 Sep - 06 Oct	FrenchBee
30 Sep - 07 Oct	Air Transat
30 Sep - 09 Oct	Air Transat
27 Sep - 04 Oct	Azores Airlines
26 Sep - 20 Oct	FrenchBee
25 Sep - 08 Oct	Azores Airlines
25 Sep - 01 Oct	Azores Airlines
26 Sep - 11 Oct	FrenchBee
26 Sep - 29 Sep	FrenchBee
25 Sep - 28 Sep	Azores Airlines
26 Sep - 29 Sep	Air Canada	direct
25 Sep - 28 Sep	Lufthansa	direct

Also check the deals for one-way flights from Montreal to Frankfurt 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 Frankfurt in September from $583

Return flights