Cheapest return flights from Ontario to Keflavik in May from $713

Best time to book flights for Ontario (ONT) to Keflavik (KEF) flights at AirHint

AirHint found the following cheapest return flights from Ontario (ONT) to Keflavik (KEF) in May 2025 (see full year).

Return flights

05 May - 20 May Alaska Airlines
01 May - 08 May Frontier Airlines
23 May - 26 May Frontier Airlines
16 May - 23 May Alaska Airlines
23 May - 27 May Alaska Airlines
27 May - 04 Jun British Airways
26 May - 02 Jun British Airways

Also check the deals for one-way flights from Ontario to Keflavik in May.

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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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