AirHint found the following cheapest return flights from Ontario (ONT) to London (LHR) in November 2025 (see full year).

Return flights

05 Nov - 12 Nov	Iberia
04 Nov - 18 Nov	British Airways
11 Nov - 18 Nov	British Airways
10 Nov - 18 Nov	Iberia
12 Nov - 19 Nov	Iberia
10 Nov - 26 Nov	Iberia
03 Nov - 14 Nov	Iberia
05 Nov - 23 Nov	Iberia
25 Nov - 02 Dec	British Airways
13 Nov - 24 Nov	Iberia
15 Nov - 23 Nov	Iberia
26 Nov - 03 Dec	Iberia
26 Nov - 16 Dec	Iberia
26 Nov - 01 Dec	Iberia
27 Nov - 01 Dec	Avianca

Also check the deals for one-way flights from Ontario to London in November.

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 Ontario to London in November from $657

Return flights