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

Return flights

06 Dec - 13 Dec	Qantas
01 Dec - 14 Dec	American Airlines
30 Dec - 12 Jan	American Airlines
07 Dec - 17 Dec	United	direct
04 Dec - 14 Dec	United	direct
04 Dec - 07 Dec	United	direct
02 Dec - 12 Dec	United	direct
07 Dec - 14 Dec	United
29 Dec - 11 Jan	United
11 Dec - 08 Jan	Spirit Airlines
25 Dec - 09 Jan	United	direct
24 Dec - 01 Jan	United	direct
25 Dec - 06 Jan	Spirit Airlines
28 Dec - 11 Jan	Air New Zealand
19 Dec - 28 Dec	Spirit Airlines
25 Dec - 06 Jan	United	direct
24 Dec - 04 Jan	United	direct
18 Dec - 28 Dec	Air New Zealand
18 Dec - 28 Dec	United	direct
18 Dec - 08 Jan	Air New Zealand

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 $811

Return flights