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

Return flights

30 Sep - 07 Oct	Brussels Airlines
23 Sep - 30 Sep	Air France
21 Sep - 30 Sep	Air France
21 Sep - 28 Sep	Air France
29 Sep - 06 Oct	Air Canada
26 Sep - 03 Oct	Air France
22 Sep - 30 Sep	Delta
24 Sep - 01 Oct	Air France
28 Sep - 05 Oct	Air France
23 Sep - 03 Oct	Air France
21 Sep - 03 Oct	Air France
22 Sep - 03 Oct	Delta
22 Sep - 01 Oct	Air Canada
22 Sep - 02 Oct	Air Canada
20 Sep - 30 Sep	Air Transat
22 Sep - 29 Sep	FrenchBee
22 Sep - 27 Sep	FrenchBee
21 Sep - 27 Sep	FrenchBee
19 Sep - 27 Sep	FrenchBee
20 Sep - 27 Sep	Air Transat

Also check the deals for one-way flights from Montreal to Helsinki 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 Helsinki in September from 567€

Return flights