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

Return flights

22 Aug - 05 Sep	Lufthansa
19 Aug - 02 Sep	Alaska Airlines
10 Aug - 24 Aug	Air France
01 Aug - 02 Sep	jetBlue
19 Aug - 24 Aug	Alaska Airlines
09 Aug - 12 Aug	Delta
19 Aug - 29 Aug	Alaska Airlines
10 Aug - 17 Aug	Air France
10 Aug - 28 Aug	jetBlue
02 Aug - 19 Aug	jetBlue
02 Aug - 18 Aug	jetBlue
03 Aug - 12 Aug	jetBlue
08 Aug - 22 Aug	jetBlue
20 Aug - 01 Sep	Alaska Airlines
27 Aug - 05 Sep	Alaska Airlines
29 Aug - 12 Sep	Alaska Airlines
31 Aug - 02 Sep	Alaska Airlines

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

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 August from 660€

Return flights