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

Return flights

06 Dec - 13 Dec	Air Transat
01 Dec - 09 Dec	Aer Lingus
02 Dec - 09 Dec	Aer Lingus
04 Dec - 07 Dec	Aer Lingus
04 Dec - 10 Dec	TAP
16 Dec - 30 Dec	Air Transat
10 Dec - 14 Dec	TAP
01 Dec - 15 Dec	Air France
05 Dec - 15 Dec	Air France
06 Dec - 06 Jan	Air Transat
16 Dec - 04 Jan	Icelandair
25 Dec - 08 Jan	Air Transat
23 Dec - 07 Jan	Icelandair
24 Dec - 31 Dec	Air Transat
16 Dec - 03 Jan	Icelandair
17 Dec - 06 Jan	Icelandair
18 Dec - 02 Jan	Icelandair
23 Dec - 03 Jan	Icelandair
11 Dec - 11 Jan	TAP
28 Dec - 11 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 484€

Return flights