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

Return flights

07 Mar - 14 Mar	Alaska Airlines
09 Mar - 16 Mar	Alaska Airlines
02 Mar - 09 Mar	Frontier Airlines
11 Mar - 18 Mar	Alaska Airlines
16 Mar - 23 Mar	Alaska Airlines
29 Mar - 05 Apr	Alaska Airlines
05 Mar - 12 Mar	Alaska Airlines
26 Mar - 02 Apr	Frontier Airlines
12 Mar - 19 Mar	Alaska Airlines
06 Mar - 13 Mar	Frontier Airlines
27 Mar - 03 Apr	Frontier Airlines
03 Mar - 10 Mar	Alaska Airlines
14 Mar - 21 Mar	Alaska Airlines
28 Mar - 04 Apr	Alaska Airlines

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

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 March from 535€

Return flights