AirHint found the following cheapest return flights from London (LHR) to Toronto (YYZ) in August 2025 (see full year).

Return flights

30 Aug - 14 Sep	Air Canada
30 Aug - 10 Sep	Air Canada
30 Aug - 11 Sep	Air Canada
29 Aug - 14 Sep	Air Canada
30 Aug - 18 Sep	Air Canada
30 Aug - 03 Sep	Air Canada
30 Aug - 21 Sep	Air Canada
30 Aug - 13 Sep	Air Canada
30 Aug - 12 Sep	Air Canada
31 Aug - 13 Sep	Air Canada
30 Aug - 31 Aug	Air Canada
28 Aug - 31 Aug	British Airways
24 Aug - 31 Aug	Delta
25 Aug - 31 Aug	Delta
24 Aug - 26 Aug	TAP
24 Aug - 27 Aug	TAP
26 Aug - 30 Aug	Aer Lingus
24 Aug - 28 Aug	TAP
26 Aug - 27 Aug	Aer Lingus
25 Aug - 27 Aug	Iberia

Also check the deals for one-way flights from London to Toronto 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 London to Toronto in August from $478

Return flights