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

Return flights

05 Dec - 12 Dec	Icelandair
01 Dec - 07 Dec	Aer Lingus
04 Dec - 14 Dec	Icelandair
08 Dec - 14 Dec	Icelandair
05 Dec - 07 Dec	Aer Lingus
04 Dec - 10 Dec	Icelandair
06 Dec - 13 Dec	Icelandair
03 Dec - 14 Dec	TAP
04 Dec - 12 Dec	Air Transat
05 Dec - 10 Dec	Icelandair
18 Dec - 10 Jan	Icelandair
06 Dec - 04 Jan	Air Transat
09 Dec - 06 Jan	Air Transat
09 Dec - 03 Jan	Air Transat
30 Dec - 24 Jan	Aer Lingus
18 Dec - 04 Jan	Icelandair
27 Dec - 01 Jan	Icelandair
14 Dec - 04 Jan	TAP
14 Dec - 18 Jan	TAP
15 Dec - 04 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 452€

Return flights