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

Return flights

30 Dec - 11 Jan	AirAsia X
28 Dec - 30 Dec	AirAsia X
30 Dec - 19 Jan	AirAsia X
31 Dec - 31 Jan	China Southern
30 Dec - 30 Jan	China Southern
29 Dec - 06 Jan	China Southern
26 Dec - 02 Jan	Air China
28 Dec - 12 Jan	AirAsia X
28 Dec - 07 Jan	AirAsia X
29 Dec - 05 Jan	China Southern
30 Dec - 06 Jan	AirAsia X
25 Dec - 28 Dec	AirAsia X

Also check the deals for one-way flights from Sydney to Istanbul 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 Sydney to Istanbul in December from 1045€

Return flights