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

Return flights

04 Dec - 11 Dec	Spirit Airlines
29 Dec - 11 Jan	Frontier Airlines
28 Dec - 11 Jan	Spirit Airlines
05 Dec - 12 Dec	Spirit Airlines
24 Dec - 31 Dec	Frontier Airlines
25 Dec - 09 Jan	United	direct
24 Dec - 31 Dec	United	direct
12 Dec - 15 Dec	Spirit Airlines
12 Dec - 15 Dec	United	direct
05 Dec - 12 Dec	United	direct
24 Dec - 04 Jan	Spirit Airlines
24 Dec - 04 Jan	United	direct
18 Dec - 08 Jan	Delta
19 Dec - 02 Jan	Air New Zealand
19 Dec - 02 Jan	United	direct

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 1148€

Return flights