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

Return flights

15 Sep - 30 Sep	Ryanair
15 Sep - 06 Oct	Ryanair
15 Sep - 24 Sep	Ryanair
15 Sep - 27 Sep	Ryanair
09 Sep - 16 Sep	Ryanair
05 Sep - 14 Sep	Air Transat
09 Sep - 01 Oct	Ryanair
08 Sep - 22 Sep	Air Transat
24 Sep - 29 Sep	Ryanair
07 Sep - 14 Sep	Air Transat
08 Sep - 14 Sep	Air Transat
03 Sep - 18 Sep	Air Transat
03 Sep - 08 Oct	Air Transat
19 Sep - 13 Oct	Air Transat	direct
09 Sep - 09 Oct	Air Transat	direct
09 Sep - 05 Oct	Air Transat
04 Sep - 06 Oct	Air Transat	direct
05 Sep - 05 Oct	Air Transat
05 Sep - 08 Oct	Air Transat
22 Sep - 19 Oct	Air Transat	direct

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 $410

Return flights