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 - 20 Jun	Air Canada
31 May - 07 Jun	Air Canada
28 May - 04 Jun	Air Canada
28 May - 18 Jun	Air Canada
12 May - 19 May	Air Canada
14 May - 21 May	Air Canada
16 May - 23 May	Air Canada
23 May - 30 May	Air Canada
24 May - 31 May	Air Canada
27 May - 03 Jun	Air France
08 May - 15 May	Lufthansa
17 May - 24 May	Air Canada
11 May - 18 May	KLM
18 May - 25 May	Air Canada
20 May - 27 May	Air Canada
26 May - 26 Jun	Air Canada
23 May - 01 Jun	Air Canada
29 May - 05 Jun	Air France

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 559€

Return flights