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

Return flights

01 Jun - 15 Jun	Alaska Airlines
01 Jun - 08 Jun	British Airways
05 Jun - 27 Jun	Iberia
17 Jun - 24 Jun	British Airways
14 Jun - 04 Jul	British Airways
03 Jun - 25 Jun	British Airways
16 Jun - 11 Jul	British Airways
16 Jun - 28 Jun	British Airways
23 Jun - 30 Jun	British Airways
23 Jun - 09 Jul	British Airways
29 Jun - 09 Jul	British Airways
18 Jun - 30 Jul	British Airways
22 Jun - 29 Jun	British Airways
18 Jun - 06 Jul	British Airways
28 Jun - 18 Jul	British Airways
23 Jun - 18 Jul	British Airways
26 Jun - 18 Jul	British Airways
24 Jun - 18 Jul	British Airways
07 Jun - 15 Jun	British Airways

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

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 June from 1034€

Return flights