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

Return flights

06 Sep - 14 Sep	Aer Lingus
06 Sep - 13 Sep	Aer Lingus
11 Sep - 19 Sep	Aer Lingus
04 Sep - 07 Sep	Aer Lingus
15 Sep - 27 Sep	Aer Lingus
12 Sep - 26 Sep	Aer Lingus
04 Sep - 18 Sep	Aer Lingus
11 Sep - 21 Sep	Aer Lingus
10 Sep - 17 Sep	Aer Lingus
23 Sep - 30 Sep	Aer Lingus
25 Sep - 06 Oct	Aer Lingus
19 Sep - 07 Oct	Aer Lingus
27 Sep - 04 Oct	Aer Lingus
14 Sep - 05 Oct	Aer Lingus
19 Sep - 03 Oct	Aer Lingus
21 Sep - 05 Oct	Aer Lingus
17 Sep - 01 Oct	Lufthansa
26 Sep - 05 Oct	Air Canada
23 Sep - 07 Oct	Lufthansa
17 Sep - 03 Oct	Lufthansa

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 $411

Return flights