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
24 May - 08 Jun	KLM
08 May - 15 May	Lufthansa
26 May - 02 Jun	Air Canada
25 May - 04 Jun	Air Canada
12 May - 19 May	Air France
27 May - 03 Jun	Air France
05 May - 12 May	Lufthansa
16 May - 27 May	Air Canada
19 May - 26 May	Lufthansa
04 May - 11 May	Lufthansa
18 May - 25 May	Lufthansa
11 May - 18 May	KLM
25 May - 01 Jun	KLM
31 May - 07 Jun	Air Canada
17 May - 24 May	Air France
21 May - 28 May	Air France
29 May - 05 Jun	WestJet

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 $645

Return flights