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

Return flights

28 Dec - 29 Dec	Icelandair	direct
25 Dec - 29 Dec	Icelandair	direct
26 Dec - 29 Dec	Icelandair	direct
23 Dec - 29 Dec	WestJet
23 Dec - 24 Dec	WestJet
30 Dec - 03 Jan	Icelandair
24 Dec - 29 Dec	Flair Airlines
23 Dec - 30 Dec	WestJet
23 Dec - 29 Dec	Icelandair	direct
25 Dec - 01 Jan	Icelandair	direct
31 Dec - 05 Jan	Icelandair
26 Dec - 31 Dec	Icelandair	direct
24 Dec - 29 Dec	Icelandair	direct
30 Dec - 02 Jan	Icelandair
26 Dec - 04 Jan	Icelandair
26 Dec - 02 Jan	Icelandair

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 611€

Return flights