Cheapest one-way flights from Ontario to London in May from $400

AirHint found the following cheapest one-way flights from Ontario (ONT) to London (LHR) in May 2026 (see full year).

One-Way flights

10 May British Airways
03 May British Airways
04 May British Airways
11 May British Airways

Also check the deals for return flights from Ontario to London in May.

Skyscanner

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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