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

Return flights

22 Jul - 04 Aug	Iberia
23 Jul - 31 Jul	Iberia
20 Jul - 27 Jul	Iberia
20 Jul - 01 Aug	Iberia
01 Jul - 12 Aug	United
20 Jul - 03 Aug	KLM
17 Jul - 31 Jul	Iberia
06 Jul - 27 Jul	Iberia
15 Jul - 27 Jul	Iberia
21 Jul - 27 Jul	Iberia
18 Jul - 25 Jul	Lufthansa
27 Jul - 12 Aug	KLM
21 Jul - 02 Aug	Iberia
09 Jul - 21 Jul	Iberia
27 Jul - 02 Aug	Iberia
23 Jul - 02 Aug	Iberia
24 Jul - 02 Aug	Iberia
27 Jul - 14 Aug	jetBlue
11 Jul - 24 Jul	Iberia
17 Jul - 25 Jul	Iberia

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

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 July from 762€

Return flights