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

Return flights

25 Dec - 14 Jan	Delta
14 Dec - 31 Dec	Turkish Airlines
25 Dec - 05 Jan	Qantas
30 Dec - 11 Jan	United	direct
24 Dec - 04 Jan	United	direct
18 Dec - 04 Jan	Air New Zealand
18 Dec - 08 Jan	Delta
20 Dec - 08 Jan	United

Also check the deals for one-way flights from Houston 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 Houston to Sydney in December from 1392€

Return flights