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

Return flights

04 Dec - 13 Dec	Korean Air
28 Dec - 11 Jan	Korean Air
28 Dec - 10 Jan	Korean Air
05 Dec - 16 Dec	China Airlines
03 Dec - 16 Dec	China Airlines
05 Dec - 15 Dec	China Airlines
02 Dec - 06 Dec	China Airlines
06 Dec - 13 Dec	China Airlines
05 Dec - 07 Dec	China Airlines
01 Dec - 14 Dec	China Airlines
27 Dec - 18 Jan	Korean Air
27 Dec - 28 Jan	STARLUX Airlines
29 Dec - 16 Jan	STARLUX Airlines
02 Dec - 27 Dec	China Airlines
30 Dec - 14 Jan	China Airlines
30 Dec - 15 Jan	China Airlines
29 Dec - 15 Jan	China Airlines
28 Dec - 08 Jan	Delta
27 Dec - 10 Jan	China Airlines
13 Dec - 25 Dec	Korean Air

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 726€

Return flights