AirHint found the following cheapest one-way flights from Montreal (YUL) to Keflavik (KEF) in August 2025 (see full year).

One-Way flights

23 Aug	Porter Airlines (Canada) Ltd
16 Aug	Porter Airlines (Canada) Ltd
29 Aug	Porter Airlines (Canada) Ltd
05 Aug	Porter Airlines (Canada) Ltd
04 Aug	Porter Airlines (Canada) Ltd
05 Aug	Air Canada	direct
23 Aug	Air Canada	direct
16 Aug	Air Canada	direct
28 Aug	Air Canada	direct
29 Aug	Air Canada	direct

Also check the deals for return flights from Montreal to Keflavik in August.

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 one-way flights from Montreal to Keflavik in August from 271€

One-Way flights