Cheapest return flights from Ontario to Keflavik in September from 713€

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

Return flights

02 Sep - 09 Sep Southwest Airlines
09 Sep - 16 Sep Southwest Airlines
21 Sep - 30 Sep Alaska Airlines
23 Sep - 30 Sep Alaska Airlines
07 Sep - 17 Sep Alaska Airlines
11 Sep - 21 Sep Alaska Airlines
30 Sep - 07 Oct Southwest Airlines
05 Sep - 16 Sep Alaska Airlines
12 Sep - 23 Sep Alaska Airlines

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

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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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