Cheapest return flights from Ontario to Keflavik in December from 1211€

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

Return flights

29 Dec - 11 Jan Alaska Airlines
17 Dec - 31 Dec Southwest Airlines

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

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