AirHint found the following cheapest return flights from London (LON) to Toronto (YYZ) in September 2026 (see full year).

Return flights

24 Sep - 02 Oct	Air Canada
10 Sep - 24 Sep	Air Canada
14 Sep - 28 Sep	Air Canada
01 Sep - 29 Sep	Air Canada
01 Sep - 30 Sep	Air Canada
15 Sep - 29 Sep	Air Canada
07 Sep - 21 Sep	Air Canada
07 Sep - 16 Sep	Air Canada
22 Sep - 27 Sep	Air Canada
04 Sep - 19 Sep	SWISS
15 Sep - 22 Sep	Air Canada
19 Sep - 03 Oct	Air Canada
30 Sep - 15 Oct	SWISS
02 Sep - 02 Oct	Aer Lingus
28 Sep - 05 Oct	Air Transat	direct
19 Sep - 03 Oct	Air Transat	direct
24 Sep - 02 Oct	Air Transat	direct
25 Sep - 02 Oct	Lufthansa	direct
02 Sep - 02 Oct	Lufthansa	direct
29 Sep - 03 Oct	Scandinavian Airlines

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 $541

Return flights