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

Return flights

10 Dec - 24 Dec	Qantas
08 Dec - 10 Dec	Qantas
05 Dec - 12 Dec	Qantas
29 Dec - 11 Jan	United
24 Dec - 31 Dec	United	direct
07 Dec - 20 Dec	Frontier Airlines
04 Dec - 07 Jan	Delta
05 Dec - 07 Jan	Delta
06 Dec - 07 Jan	Delta
25 Dec - 09 Jan	United	direct
25 Dec - 31 Dec	Frontier Airlines
24 Dec - 04 Jan	United	direct
22 Dec - 05 Jan	Frontier Airlines
25 Dec - 31 Dec	United	direct
29 Dec - 04 Jan	Frontier Airlines
29 Dec - 04 Jan	United	direct
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 724€

Return flights