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
31 May - 07 Jun	Air Canada
26 May - 02 Jun	Air Canada
08 May - 15 May	Lufthansa
20 May - 27 May	Air Canada
28 May - 04 Jun	Air Canada
05 May - 12 May	Lufthansa
11 May - 18 May	KLM
25 May - 01 Jun	KLM
12 May - 19 May	KLM
10 May - 17 May	KLM
27 May - 03 Jun	Air Canada
29 May - 05 Jun	Air Canada
18 May - 25 May	Air Canada
01 May - 08 May	WestJet
02 May - 09 May	WestJet
07 May - 14 May	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 $605

Return flights