AirHint found the following cheapest return flights from Montreal (YUL) to Helsinki (HEL) in September 2026 (see full year).

Return flights

30 Sep - 07 Oct	Air Canada
28 Sep - 05 Oct	Air Canada
29 Sep - 06 Oct	Air Canada
23 Sep - 30 Sep	Air Canada
27 Sep - 04 Oct	Air Canada
24 Sep - 01 Oct	Air Canada
01 Sep - 08 Sep	Air France
02 Sep - 09 Sep	Air France
06 Sep - 13 Sep	Air France
07 Sep - 14 Sep	Air France
08 Sep - 15 Sep	Air France
09 Sep - 16 Sep	Air France
13 Sep - 20 Sep	Air France
14 Sep - 21 Sep	Air France
15 Sep - 22 Sep	Air France
25 Sep - 02 Oct	Air Canada
26 Sep - 03 Oct	Air Canada

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 709€

Return flights