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

Return flights

29 Sep - 06 Oct	Air Transat
18 Sep - 25 Sep	Air Transat
10 Sep - 17 Sep	Porter Airlines (Canada) Ltd
16 Sep - 23 Sep	Air Transat
17 Sep - 24 Sep	Air Transat
03 Sep - 10 Sep	FrenchBee
14 Sep - 22 Sep	Air Transat
01 Sep - 12 Sep	Air Transat
21 Sep - 28 Sep	WestJet
15 Sep - 22 Sep	Air Transat
23 Sep - 30 Sep	SWISS
27 Sep - 04 Oct	Air Transat
24 Sep - 01 Oct	FrenchBee
25 Sep - 02 Oct	Air Transat
30 Sep - 07 Oct	Air Transat
26 Sep - 03 Oct	Air Transat
26 Sep - 10 Oct	Delta

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 521€

Return flights