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

Return flights

15 Sep - 23 Sep	Ryanair
12 Sep - 20 Sep	easyJet
13 Sep - 20 Sep	easyJet
10 Sep - 24 Sep	easyJet
25 Sep - 10 Oct	Ryanair
20 Sep - 02 Oct	Ryanair
19 Sep - 26 Sep	easyJet
08 Sep - 21 Sep	Ryanair
14 Sep - 21 Sep	Ryanair
01 Sep - 08 Sep	Ryanair
07 Sep - 14 Sep	Ryanair
07 Sep - 16 Sep	easyJet
21 Sep - 05 Oct	easyJet
21 Sep - 19 Oct	Turkish Airlines
29 Sep - 04 Oct	Ryanair
20 Sep - 03 Oct	Ryanair

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 $664

Return flights