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

Return flights

11 Sep - 23 Sep	Air Dolomiti
10 Sep - 17 Sep	SWISS
17 Sep - 13 Oct	SWISS
17 Sep - 23 Sep	SWISS
09 Sep - 23 Sep	SWISS
18 Sep - 22 Sep	Lufthansa
22 Sep - 06 Oct	Lufthansa
16 Sep - 21 Oct	SWISS
16 Sep - 19 Oct	SWISS
17 Sep - 07 Oct	SWISS
18 Sep - 28 Sep	Lufthansa
18 Sep - 30 Sep	Lufthansa
24 Sep - 30 Sep	Air Dolomiti
16 Sep - 22 Sep	Lufthansa
18 Sep - 24 Sep	Lufthansa
30 Sep - 08 Oct	Lufthansa
30 Sep - 07 Oct	Lufthansa
30 Sep - 21 Oct	SWISS
23 Sep - 02 Oct	SWISS
23 Sep - 16 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.

Book a cheap hotel in Toronto

Cheap car rent in Toronto

Cheapest return flights from London to Toronto in September from 463€

Return flights