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

Return flights

02 Dec - 11 Dec	Scoot
01 Dec - 05 Dec	Scoot
01 Dec - 11 Dec	Scoot
02 Dec - 09 Dec	Scoot
02 Dec - 15 Dec	Scoot
01 Dec - 09 Dec	Scoot
01 Dec - 13 Dec	Scoot
01 Dec - 10 Dec	Scoot
01 Dec - 08 Dec	Scoot
03 Dec - 07 Dec	Jetstar
01 Dec - 14 Jan	Scoot
13 Dec - 01 Jan	Batik Air Malaysia
01 Dec - 30 Jan	Scoot
04 Dec - 13 Jan	Jetstar
12 Dec - 01 Jan	Jetstar
07 Dec - 01 Jan	Jetstar
08 Dec - 01 Jan	Jetstar
02 Dec - 14 Jan	Scoot
01 Dec - 12 Jan	Scoot
01 Dec - 01 Jan	Jetstar

Also check the deals for one-way flights from Sydney 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.

Book a cheap hotel in Bangkok

Cheap car rent in Bangkok

Cheapest return flights from Sydney to Bangkok in December from 335€

Return flights