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

Return flights

30 Sep - 07 Oct	Air Canada	direct
29 Sep - 06 Oct	Porter Airlines (Canada) Ltd
19 Sep - 11 Oct	FrenchBee
28 Sep - 05 Oct	FrenchBee
24 Sep - 01 Oct	FrenchBee
23 Sep - 15 Oct	Porter Airlines (Canada) Ltd
23 Sep - 30 Sep	Porter Airlines (Canada) Ltd
27 Sep - 10 Oct	Air Transat
25 Sep - 02 Oct	Air Transat
27 Sep - 04 Oct	Air Canada
18 Sep - 11 Oct	Air Transat
21 Sep - 28 Sep	FrenchBee
19 Sep - 26 Sep	FrenchBee
21 Sep - 22 Sep	Air Transat
20 Sep - 27 Sep	Air Transat
20 Sep - 27 Sep	Austrian Airlines	direct

Also check the deals for one-way flights from Montreal to Vienna 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 Vienna in September from $661

Return flights