Cheapest return flights from Ontario to Keflavik in October from $816

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

Return flights

26 Oct - 07 Nov Frontier Airlines
22 Oct - 26 Oct Alaska Airlines
25 Oct - 02 Nov Alaska Airlines
24 Oct - 02 Nov Alaska Airlines
24 Oct - 31 Oct Alaska Airlines
12 Oct - 23 Oct KLM
06 Oct - 13 Oct KLM
09 Oct - 16 Oct KLM

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

Skyscanner

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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