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

Return flights

02 Dec - 07 Dec	Icelandair
10 Dec - 14 Dec	Porter Airlines (Canada) Ltd
16 Dec - 10 Jan	Air Transat
01 Dec - 07 Dec	Aer Lingus
01 Dec - 09 Dec	Aer Lingus
03 Dec - 07 Dec	Aer Lingus
05 Dec - 15 Dec	Icelandair
02 Dec - 10 Dec	TAP
11 Dec - 30 Jan	TAP
05 Dec - 14 Dec	Air Transat
11 Dec - 31 Jan	TAP
09 Dec - 08 Jan	Icelandair
13 Dec - 11 Jan	TAP
12 Dec - 30 Jan	TAP
14 Dec - 07 Jan	TAP
01 Dec - 10 Dec	TAP
13 Dec - 07 Jan	TAP
10 Dec - 08 Jan	Icelandair
10 Dec - 05 Jan	TAP
07 Dec - 27 Dec	Scandinavian Airlines

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 $493

Return flights