AirHint found the following cheapest return flights from Montreal (YUL) to St.-denis (RUN) in September 2026 (see full year).

Return flights

07 Sep - 14 Sep	FrenchBee
04 Sep - 11 Sep	FrenchBee
06 Sep - 13 Sep	FrenchBee
09 Sep - 03 Oct	FrenchBee
09 Sep - 01 Oct	FrenchBee
18 Sep - 25 Sep	FrenchBee
05 Sep - 12 Sep	FrenchBee
11 Sep - 18 Sep	FrenchBee
13 Sep - 20 Sep	FrenchBee
19 Sep - 26 Sep	FrenchBee
12 Sep - 19 Sep	FrenchBee
14 Sep - 21 Sep	FrenchBee
27 Sep - 04 Oct	FrenchBee
26 Sep - 03 Oct	FrenchBee
25 Sep - 02 Oct	FrenchBee
30 Sep - 07 Oct	KLM
29 Sep - 06 Oct	KLM
28 Sep - 05 Oct	KLM
24 Sep - 01 Oct	KLM

Also check the deals for one-way flights from Montreal to St.-denis 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 St.-denis in September from $1116

Return flights