AirHint found the following cheapest return flights from Bangkok (DMK) to Sydney (SYD) in December 2025 (see full year).

Return flights

27 Dec - 17 Jan	AirAsia
27 Dec - 13 Jan	AirAsia
29 Dec - 19 Jan	AirAsia
29 Dec - 17 Jan	AirAsia
29 Dec - 18 Jan	AirAsia
29 Dec - 13 Jan	AirAsia
31 Dec - 20 Jan	AirAsia
31 Dec - 19 Jan	AirAsia
31 Dec - 17 Jan	AirAsia
31 Dec - 18 Jan	AirAsia
20 Dec - 31 Dec	Nok Air
01 Dec - 08 Dec	Thai AirAsia
06 Dec - 09 Dec	AirAsia
03 Dec - 09 Dec	Thai AirAsia
03 Dec - 11 Dec	Thai AirAsia
04 Dec - 11 Dec	Thai AirAsia
09 Dec - 16 Dec	Thai AirAsia
09 Dec - 14 Dec	Thai AirAsia
01 Dec - 11 Dec	Thai AirAsia
07 Dec - 16 Dec	Thai AirAsia

Also check the deals for one-way flights from Bangkok to Sydney 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 Bangkok to Sydney in December from $510

Return flights