AirHint found the following cheapest return flights from Ontario (ONT) to London (LHR) in December 2026 (see full year).
Return flights
| 01 Dec - 15 Dec | British Airways | ||
| 15 Dec - 27 Dec | KLM | ||
| 14 Dec - 31 Dec | KLM | ||
| 18 Dec - 25 Dec | British Airways | ||
| 10 Dec - 24 Dec | British Airways |
Also check the deals for one-way flights from Ontario to London in December.
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