AirHint found the following cheapest return flights from Ontario (ONT) to London (LGW) in January 2026 (see full year).

Return flights

13 Jan - 07 Feb	Frontier Airlines
05 Jan - 31 Jan	Frontier Airlines
08 Jan - 31 Jan	Iberia
14 Jan - 22 Jan	Alaska Airlines
02 Jan - 07 Jan	British Airways

Also check the deals for one-way flights from Ontario to London in January.

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 Ontario to London in January from $616

Return flights