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

Return flights

02 Sep - 10 Sep	Air Canada
04 Sep - 11 Sep	Air Canada
03 Sep - 10 Sep	Air Canada
05 Sep - 12 Sep	Air Canada
02 Sep - 09 Sep	Air Canada
08 Sep - 15 Sep	Air Canada
16 Sep - 23 Sep	Air Canada
06 Sep - 13 Sep	Air Canada
09 Sep - 16 Sep	Air Canada
15 Sep - 22 Sep	Air Canada
27 Sep - 05 Oct	Air Canada
23 Sep - 05 Oct	Air Canada
20 Sep - 05 Oct	Air Canada
28 Sep - 05 Oct	Air Canada
25 Sep - 02 Oct	Air Canada
29 Sep - 06 Oct	Air Canada
24 Sep - 01 Oct	Air Canada
30 Sep - 07 Oct	Air France
20 Sep - 03 Oct	Air Canada	direct
27 Sep - 04 Oct	Air Canada

Also check the deals for one-way flights from Montreal to Keflavik 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 Keflavik in September from $576

Return flights