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

Return flights

13 Oct - 17 Oct	Porter Airlines (Canada) Ltd
19 Oct - 26 Oct	Lufthansa
02 Oct - 09 Oct	Porter Airlines (Canada) Ltd
16 Oct - 23 Oct	Lufthansa
18 Oct - 25 Oct	Lufthansa
12 Oct - 19 Oct	KLM
06 Oct - 13 Oct	SWISS
13 Oct - 20 Oct	KLM
11 Oct - 18 Oct	Lufthansa
24 Oct - 31 Oct	Lufthansa
25 Oct - 01 Nov	WestJet
29 Oct - 05 Nov	WestJet
26 Oct - 02 Nov	Porter Airlines (Canada) Ltd
28 Oct - 04 Nov	Porter Airlines (Canada) Ltd
30 Oct - 06 Nov	Porter Airlines (Canada) Ltd
27 Oct - 03 Nov	Porter Airlines (Canada) Ltd
31 Oct - 07 Nov	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Montreal to Keflavik in October.

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 October from $631

Return flights