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

Return flights

31 Aug - 12 Sep	WestJet
31 Aug - 07 Sep	WestJet
31 Aug - 08 Sep	WestJet
21 Aug - 01 Sep	WestJet
29 Aug - 14 Sep	WestJet
31 Aug - 06 Sep	WestJet
31 Aug - 05 Sep	WestJet
29 Aug - 07 Sep	WestJet
27 Aug - 15 Sep	WestJet
29 Aug - 15 Sep	WestJet
29 Aug - 31 Aug	WestJet
22 Aug - 31 Aug	Azores Airlines
27 Aug - 31 Aug	WestJet
26 Aug - 29 Aug	WestJet
23 Aug - 28 Aug	Azores Airlines
24 Aug - 29 Aug	WestJet
26 Aug - 31 Aug	WestJet
24 Aug - 27 Aug	WestJet
25 Aug - 29 Aug	WestJet
25 Aug - 31 Aug	Air Transat

Also check the deals for one-way flights from Toronto to London in August.

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 August from $736

Return flights