AirHint found the following cheapest return flights from Ontario (ONT) to Keflavik (KEF) in June 2026 (see full year).

Return flights

01 Jun - 12 Jun	Alaska Airlines
30 Jun - 08 Jul	Alaska Airlines
27 Jun - 12 Jul	Alaska Airlines
20 Jun - 04 Jul	Alaska Airlines
01 Jun - 13 Jun	Alaska Airlines
18 Jun - 03 Jul	Alaska Airlines
16 Jun - 27 Jun	Alaska Airlines
26 Jun - 12 Jul	Alaska Airlines
16 Jun - 25 Jun	British Airways
15 Jun - 22 Jun	British Airways

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

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 Ontario to Keflavik in June from $791

Return flights