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

Return flights

31 Dec - 19 Jan	Air Canada
31 Dec - 17 Jan	Lufthansa
31 Dec - 15 Jan	Air Canada
30 Dec - 21 Jan	Air Canada
31 Dec - 16 Jan	Air Canada
30 Dec - 20 Jan	Air Canada
29 Dec - 15 Jan	Air Canada
29 Dec - 12 Jan	Air Canada
30 Dec - 11 Jan	Air Canada
31 Dec - 19 Jan	British Airways	direct
25 Dec - 29 Dec	Iberia
25 Dec - 30 Dec	Air Canada
26 Dec - 28 Dec	Delta
25 Dec - 28 Dec	Virgin Atlantic
27 Dec - 30 Dec	British Airways	direct
29 Dec - 31 Dec	TAP
26 Dec - 30 Dec	British Airways
25 Dec - 31 Dec	Air Canada
26 Dec - 31 Dec	Air Canada
25 Dec - 28 Dec	Air Canada	direct

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 $667

Return flights