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

Return flights

10 Dec - 15 Dec	Icelandair
12 Dec - 04 Jan	Icelandair
12 Dec - 30 Dec	Icelandair
12 Dec - 27 Dec	Icelandair
15 Dec - 05 Jan	Icelandair
18 Dec - 05 Jan	Icelandair
30 Dec - 06 Jan	Icelandair
05 Dec - 28 Dec	TAP
06 Dec - 28 Dec	TAP
22 Dec - 31 Dec	Icelandair
25 Dec - 31 Dec	Icelandair
26 Dec - 12 Jan	TAP
19 Dec - 04 Jan	Icelandair
13 Dec - 27 Dec	TAP
26 Dec - 31 Dec	TAP
23 Dec - 11 Jan	TAP
14 Dec - 30 Dec	TAP
18 Dec - 11 Jan	TAP
15 Dec - 06 Jan	TAP
11 Dec - 03 Jan	TAP

Also check the deals for one-way flights from Toronto to London 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 London in December from $659

Return flights