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

Return flights

05 Dec - 07 Dec	Icelandair
11 Dec - 07 Jan	Azores Airlines
12 Dec - 04 Jan	Icelandair
14 Dec - 24 Dec	TAP
18 Dec - 04 Jan	Icelandair
10 Dec - 24 Dec	TAP
13 Dec - 04 Jan	Icelandair
04 Dec - 10 Dec	TAP
12 Dec - 24 Dec	TAP
26 Dec - 31 Dec	TAP
06 Dec - 28 Dec	TAP
27 Dec - 04 Jan	Icelandair
20 Dec - 04 Jan	Icelandair
18 Dec - 03 Jan	Icelandair
14 Dec - 05 Jan	TAP
19 Dec - 04 Jan	Icelandair
21 Dec - 31 Dec	TAP
14 Dec - 01 Jan	TAP
16 Dec - 28 Dec	TAP
18 Dec - 22 Dec	Icelandair

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 489€

Return flights