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

Return flights

12 Dec - 20 Dec	Icelandair	direct
12 Dec - 19 Dec	Icelandair	direct
11 Dec - 18 Dec	Icelandair	direct
27 Dec - 11 Jan	Icelandair	direct
30 Dec - 06 Jan	Icelandair	direct
21 Dec - 01 Jan	Icelandair	direct
19 Dec - 28 Dec	Icelandair	direct
15 Dec - 03 Jan	Icelandair	direct

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

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 Toronto to Keflavik in December from 486€

Return flights