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

Return flights

02 Dec - 15 Dec	Delta
01 Dec - 11 Dec	STARLUX Airlines
05 Dec - 19 Dec	STARLUX Airlines
01 Dec - 08 Dec	STARLUX Airlines
31 Dec - 15 Jan	STARLUX Airlines
05 Dec - 29 Dec	China Airlines
30 Dec - 14 Jan	China Airlines
08 Dec - 30 Dec	China Airlines
26 Dec - 06 Jan	STARLUX Airlines
24 Dec - 28 Dec	STARLUX Airlines
30 Dec - 10 Jan	China Airlines
09 Dec - 24 Dec	China Airlines
09 Dec - 20 Jan	China Airlines
26 Dec - 10 Jan	STARLUX Airlines
29 Dec - 05 Jan	STARLUX Airlines
26 Dec - 11 Jan	STARLUX Airlines
25 Dec - 15 Jan	China Airlines
10 Dec - 30 Dec	China Airlines
02 Dec - 06 Jan	China Airlines
12 Dec - 27 Dec	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 712€

Return flights