AirHint found the following cheapest return flights from Montreal (YUL) to Keflavik (KEF) in May 2026 (see full year).

Return flights

30 May - 06 Jun	Air Canada
26 May - 02 Jun	Air Canada
24 May - 31 May	Air Canada
31 May - 07 Jun	Air Canada
14 May - 21 May	Air Canada
27 May - 03 Jun	Air France
08 May - 15 May	Lufthansa
25 May - 01 Jun	Air Canada
19 May - 26 May	KLM
12 May - 19 May	KLM
20 May - 27 May	Air Canada
17 May - 24 May	Air France
21 May - 28 May	Air France
28 May - 04 Jun	KLM
01 May - 08 May	Porter Airlines (Canada) Ltd
07 May - 14 May	Porter Airlines (Canada) Ltd
29 May - 05 Jun	Porter Airlines (Canada) Ltd

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

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 May from $663

Return flights