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

Return flights

16 Sep - 23 Sep	SWISS
02 Sep - 09 Sep	Lufthansa
15 Sep - 22 Sep	FrenchBee
17 Sep - 24 Sep	FrenchBee
10 Sep - 17 Sep	FrenchBee
03 Sep - 10 Sep	FrenchBee
27 Sep - 08 Oct	Air Transat
14 Sep - 17 Sep	Air Transat
07 Sep - 14 Sep	Air Transat
01 Sep - 17 Sep	FrenchBee
04 Sep - 11 Sep	Air Transat
29 Sep - 06 Oct	Air Transat
28 Sep - 05 Oct	Air Transat
24 Sep - 08 Oct	Air Transat
25 Sep - 02 Oct	Air Transat
18 Sep - 01 Oct	Air Canada
24 Sep - 01 Oct	SWISS
30 Sep - 07 Oct	Air Canada
26 Sep - 03 Oct	Air Transat
27 Sep - 04 Oct	Air Transat

Also check the deals for one-way flights from Montreal to Oslo 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 Oslo in September from $538

Return flights