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

Return flights

26 May - 02 Jun	Air Canada
19 May - 26 May	Air Canada
07 May - 14 May	Lufthansa
29 May - 05 Jun	Air Canada
11 May - 18 May	KLM
12 May - 19 May	Air France
30 May - 06 Jun	Air Canada
25 May - 01 Jun	Air Canada
03 May - 10 May	Lufthansa
31 May - 07 Jun	Air Canada
05 May - 12 May	Lufthansa
17 May - 24 May	Lufthansa
06 May - 13 May	WestJet
08 May - 15 May	WestJet
10 May - 17 May	WestJet
27 May - 03 Jun	WestJet
28 May - 04 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 $617

Return flights