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

Return flights

16 Dec - 16 Jan	Thai AirAsia
02 Dec - 19 Jan	Thai AirAsia
04 Dec - 25 Jan	Thai AirAsia
10 Dec - 26 Jan	Thai AirAsia
18 Dec - 13 Jan	Thai AirAsia
17 Dec - 13 Jan	Thai AirAsia
01 Dec - 07 Dec	Thai AirAsia
04 Dec - 11 Dec	Thai AirAsia
02 Dec - 12 Jan	Thai AirAsia
24 Dec - 14 Jan	AirAsia
26 Dec - 14 Jan	AirAsia
25 Dec - 14 Jan	AirAsia
05 Dec - 09 Dec	Thai AirAsia
09 Dec - 15 Dec	Thai AirAsia
08 Dec - 13 Dec	Thai AirAsia
04 Dec - 08 Dec	Thai AirAsia
07 Dec - 14 Dec	Thai AirAsia
05 Dec - 13 Dec	Thai AirAsia
04 Dec - 12 Dec	Thai AirAsia
04 Dec - 13 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 $401

Return flights