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

Return flights

09 Sep - 17 Sep	WestJet
09 Sep - 18 Sep	WestJet
18 Sep - 21 Sep	WestJet
01 Sep - 15 Sep	WestJet
18 Sep - 22 Sep	WestJet
30 Sep - 14 Oct	WestJet
30 Sep - 13 Oct	WestJet
29 Sep - 06 Oct	WestJet
27 Sep - 13 Oct	WestJet
16 Sep - 13 Oct	WestJet
17 Sep - 13 Oct	WestJet
05 Sep - 08 Sep	Air Transat
29 Sep - 08 Oct	WestJet
10 Sep - 17 Sep	WestJet
08 Sep - 15 Sep	WestJet
07 Sep - 17 Sep	Air Transat
17 Sep - 24 Sep	Air Transat
29 Sep - 11 Oct	Air Transat
28 Sep - 03 Oct	Icelandair
28 Sep - 12 Oct	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 274€

Return flights