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

Return flights

10 Sep - 17 Sep	FrenchBee
29 Sep - 06 Oct	Air Transat
12 Sep - 19 Sep	Air Transat
03 Sep - 10 Sep	FrenchBee
10 Sep - 18 Sep	FrenchBee
09 Sep - 16 Sep	Air Transat
10 Sep - 24 Sep	FrenchBee
07 Sep - 21 Sep	FrenchBee
29 Sep - 08 Oct	FrenchBee
11 Sep - 17 Sep	Air Transat
30 Sep - 07 Oct	WestJet
30 Sep - 08 Oct	WestJet
10 Sep - 14 Sep	FrenchBee
28 Sep - 05 Oct	Air Transat
09 Sep - 12 Sep	Air Transat
29 Sep - 09 Oct	FrenchBee
30 Sep - 09 Oct	WestJet
24 Sep - 15 Oct	FrenchBee
26 Sep - 03 Oct	Air Transat
24 Sep - 01 Oct	FrenchBee

Also check the deals for one-way flights from Montreal to Copenhagen 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 Copenhagen in September from $617

Return flights