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

Return flights

30 Sep - 05 Oct	Air Canada
30 Sep - 14 Oct	Air Canada
29 Sep - 14 Oct	Air Canada	direct
29 Sep - 07 Oct	Air Canada	direct
29 Sep - 16 Oct	Air Canada	direct
27 Sep - 18 Oct	Air Canada
27 Sep - 06 Oct	Air Canada
30 Sep - 16 Oct	Air Canada
29 Sep - 18 Oct	Air Canada	direct
27 Sep - 20 Oct	Air Canada
23 Sep - 29 Sep	Lufthansa
24 Sep - 29 Sep	Austrian Airlines
27 Sep - 28 Sep	Air Canada
27 Sep - 30 Sep	Austrian Airlines
24 Sep - 28 Sep	SWISS
27 Sep - 29 Sep	Air Canada
23 Sep - 30 Sep	Austrian Airlines
24 Sep - 30 Sep	Austrian Airlines
23 Sep - 28 Sep	SWISS
26 Sep - 28 Sep	Air Canada

Also check the deals for one-way flights from London to Toronto in September.

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 September from 389€

Return flights