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

Return flights

11 Sep - 25 Sep	TAP
03 Sep - 19 Sep	TAP
03 Sep - 18 Sep	TAP
02 Sep - 18 Sep	TAP
02 Sep - 19 Sep	TAP
16 Sep - 19 Sep	TAP
15 Sep - 19 Sep	TAP
04 Sep - 11 Sep	TAP
03 Sep - 12 Sep	TAP
04 Sep - 21 Sep	TAP
29 Sep - 27 Oct	Finnair	direct
26 Sep - 11 Oct	Air Canada
26 Sep - 11 Oct	British Airways	direct
17 Sep - 02 Oct	Aer Lingus	direct
08 Sep - 04 Oct	WestJet

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 $621

Return flights