AirHint found the following cheapest return flights from Ontario (ONT) to Athens (ATH) in December 2025 (see full year).

Return flights

04 Dec - 11 Dec	British Airways
05 Dec - 10 Dec	British Airways
09 Dec - 11 Jan	British Airways
24 Dec - 07 Jan	British Airways
08 Dec - 29 Dec	British Airways
01 Dec - 08 Dec	British Airways
01 Dec - 15 Dec	British Airways
25 Dec - 08 Jan	British Airways
17 Dec - 25 Dec	British Airways
17 Dec - 10 Jan	British Airways
22 Dec - 30 Dec	British Airways
24 Dec - 31 Dec	British Airways
22 Dec - 29 Dec	British Airways
25 Dec - 31 Dec	British Airways
01 Dec - 01 Jan	British Airways
29 Dec - 05 Jan	British Airways
15 Dec - 06 Jan	British Airways
28 Dec - 05 Jan	British Airways
17 Dec - 11 Jan	British Airways
21 Dec - 08 Jan	British Airways

Also check the deals for one-way flights from Ontario to Athens in December.

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 Athens in December from $764

Return flights