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

Return flights

29 Sep - 06 Oct	Lufthansa
22 Sep - 06 Oct	Lufthansa
29 Sep - 04 Oct	Porter Airlines (Canada) Ltd
30 Sep - 05 Oct	Air Transat
23 Sep - 06 Oct	Lufthansa
28 Sep - 03 Oct	WestJet
29 Sep - 07 Oct	Porter Airlines (Canada) Ltd
23 Sep - 27 Sep	WestJet
30 Sep - 07 Oct	WestJet
23 Sep - 26 Sep	WestJet
30 Sep - 16 Oct	WestJet
26 Sep - 03 Oct	Air Transat
17 Sep - 27 Sep	WestJet
21 Sep - 22 Sep	Air Transat
17 Sep - 22 Sep	WestJet
21 Sep - 23 Sep	Air Transat
17 Sep - 24 Sep	Air Canada
21 Sep - 28 Sep	WestJet
17 Sep - 26 Sep	WestJet
23 Sep - 30 Sep	Air Transat

Also check the deals for one-way flights from Toronto to London 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 Toronto to London in September from 462€

Return flights