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

Return flights

09 Sep - 16 Sep	Porter Airlines (Canada) Ltd
02 Sep - 09 Sep	Air Transat
16 Sep - 23 Sep	Porter Airlines (Canada) Ltd
10 Sep - 23 Sep	Air Transat
17 Sep - 09 Oct	Air Transat
14 Sep - 21 Sep	Air Transat
12 Sep - 21 Sep	Air Transat
17 Sep - 24 Sep	Air Transat
15 Sep - 22 Sep	Air Transat
04 Sep - 11 Sep	Air Transat
11 Sep - 18 Sep	Air Transat
26 Sep - 03 Oct	Air Transat
29 Sep - 06 Oct	Air Transat
28 Sep - 05 Oct	Air Transat
27 Sep - 04 Oct	Air Transat
24 Sep - 08 Oct	Air Transat
25 Sep - 02 Oct	Air Transat
24 Sep - 01 Oct	Air Transat
30 Sep - 07 Oct	SWISS
13 Sep - 02 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 554€

Return flights