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

Return flights

02 Dec - 07 Dec	Korean Air
07 Dec - 24 Dec	Korean Air
02 Dec - 12 Dec	Korean Air
02 Dec - 28 Jan	Korean Air
09 Dec - 20 Jan	Korean Air
03 Dec - 31 Dec	STARLUX Airlines
03 Dec - 13 Dec	STARLUX Airlines
03 Dec - 23 Dec	STARLUX Airlines
03 Dec - 30 Dec	STARLUX Airlines
09 Dec - 29 Dec	Korean Air
24 Dec - 16 Jan	STARLUX Airlines
23 Dec - 28 Dec	Korean Air
22 Dec - 25 Dec	Korean Air
27 Dec - 16 Jan	STARLUX Airlines
04 Dec - 30 Jan	China Airlines
23 Dec - 14 Jan	Korean Air
26 Dec - 06 Jan	STARLUX Airlines
22 Dec - 20 Jan	Korean Air
25 Dec - 12 Jan	China Airlines
27 Dec - 07 Jan	STARLUX Airlines

Also check the deals for one-way flights from Ontario to Bangkok 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 Bangkok in December from $793

Return flights