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

Return flights

04 Sep - 11 Sep	SWISS
01 Sep - 08 Sep	Air Transat
22 Sep - 29 Sep	Air Transat
08 Sep - 15 Sep	Air Transat
14 Sep - 29 Sep	Air Transat
14 Sep - 21 Sep	Air Transat
07 Sep - 14 Sep	Air Transat
17 Sep - 24 Sep	Air Transat
15 Sep - 30 Sep	FrenchBee
04 Sep - 18 Sep	Porter Airlines (Canada) Ltd
24 Sep - 01 Oct	FrenchBee
25 Sep - 02 Oct	Air Canada
29 Sep - 06 Oct	Air Transat
26 Sep - 03 Oct	Air Transat
23 Sep - 09 Oct	Air Canada
28 Sep - 05 Oct	Air Canada
30 Sep - 07 Oct	Air Canada
27 Sep - 04 Oct	Air Canada
30 Sep - 09 Oct	Air Canada
26 Sep - 08 Oct	Air Transat

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 $465

Return flights