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

Return flights

06 Jan - 13 Jan	Southwest Airlines
25 Jan - 01 Feb	Southwest Airlines
11 Jan - 18 Jan	Southwest Airlines
18 Jan - 25 Jan	Southwest Airlines
07 Jan - 14 Jan	Southwest Airlines
14 Jan - 21 Jan	Southwest Airlines
26 Jan - 02 Feb	Southwest Airlines
28 Jan - 04 Feb	Southwest Airlines
12 Jan - 19 Jan	Southwest Airlines
16 Jan - 23 Jan	Southwest Airlines
23 Jan - 30 Jan	Southwest Airlines
19 Jan - 26 Jan	Southwest Airlines
30 Jan - 06 Feb	Southwest Airlines
03 Jan - 10 Jan	Southwest Airlines

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

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 January from $923

Return flights