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

Return flights

22 Sep - 29 Sep	Condor
30 Sep - 07 Oct	Condor
15 Sep - 22 Sep	Condor
16 Sep - 23 Sep	Condor
17 Sep - 24 Sep	Condor
15 Sep - 29 Sep	Condor
16 Sep - 29 Sep	Condor
21 Sep - 28 Sep	WestJet
02 Sep - 09 Sep	Porter Airlines (Canada) Ltd
20 Sep - 28 Sep	Porter Airlines (Canada) Ltd
09 Sep - 16 Sep	Porter Airlines (Canada) Ltd
24 Sep - 01 Oct	Condor
29 Sep - 06 Oct	Condor
28 Sep - 05 Oct	Condor
25 Sep - 02 Oct	Condor
19 Sep - 10 Oct	FrenchBee
27 Sep - 04 Oct	Air Transat
26 Sep - 03 Oct	FrenchBee
24 Sep - 01 Oct	Brussels Airlines	direct
30 Sep - 07 Oct	Brussels Airlines	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 511€

Return flights