Cheapest return flights from Ontario to Keflavik in June from $672

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 June 2025 (see full year).

Return flights

02 Jun - 08 Jun Frontier Airlines
09 Jun - 16 Jun Frontier Airlines
12 Jun - 15 Jun Frontier Airlines
14 Jun - 21 Jun Frontier Airlines
28 Jun - 09 Jul Frontier Airlines
29 Jun - 09 Jul Frontier Airlines
26 Jun - 03 Jul Frontier Airlines
08 Jun - 17 Jun Alaska Airlines
16 Jun - 23 Jun British Airways
21 Jun - 28 Jun British Airways
19 Jun - 26 Jun British Airways

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

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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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