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

Return flights

28 Apr - 05 May	Alaska Airlines
02 Apr - 09 Apr	Frontier Airlines
16 Apr - 23 Apr	Frontier Airlines
23 Apr - 30 Apr	Frontier Airlines
15 Apr - 22 Apr	Alaska Airlines
17 Apr - 24 Apr	Frontier Airlines
24 Apr - 01 May	Alaska Airlines
29 Apr - 06 May	Alaska Airlines
18 Apr - 25 Apr	Alaska Airlines
19 Apr - 26 Apr	British Airways
05 Apr - 12 Apr	British Airways
08 Apr - 15 Apr	Alaska Airlines
09 Apr - 16 Apr	Alaska Airlines

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

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 April from 508€

Return flights