Cheapest one-way flights from Ontario to London in May from $305

Best time to book flights for Ontario (ONT) to London (LGW) flights at AirHint

AirHint found the following cheapest one-way flights from Ontario (ONT) to London (LGW) in May 2025 (see full year).

One-Way flights

03 May Frontier Airlines
02 May Frontier Airlines
16 May Frontier Airlines
15 May Frontier Airlines
09 May Frontier Airlines
11 May jetBlue
04 May jetBlue
07 May jetBlue
05 May British Airways
17 May jetBlue

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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