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

Return flights

24 Sep - 01 Oct	FrenchBee
29 Sep - 06 Oct	Air France
18 Sep - 24 Sep	Delta
19 Sep - 26 Sep	KLM
24 Sep - 05 Oct	Delta
23 Sep - 30 Sep	Air France
30 Sep - 07 Oct	SWISS
26 Sep - 03 Oct	KLM
25 Sep - 02 Oct	SWISS
28 Sep - 05 Oct	FrenchBee
25 Sep - 18 Oct	Air Canada
18 Sep - 24 Sep	Air Canada	direct
22 Sep - 29 Sep	FrenchBee
21 Sep - 28 Sep	FrenchBee
25 Sep - 29 Sep	Air Canada	direct
27 Sep - 04 Oct	Air Transat
27 Sep - 29 Sep	Air Transat
20 Sep - 11 Oct	Air Transat
20 Sep - 27 Sep	Air Transat
21 Sep - 28 Sep	Lufthansa	direct

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.

Book a cheap hotel in Copenhagen

Cheap car rent in Copenhagen

Cheapest return flights from Montreal to Copenhagen in September from 520€

Return flights