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

Return flights

05 Dec - 09 Dec	Frontier Airlines
05 Dec - 19 Dec	Hawaiian Airlines
27 Dec - 05 Jan	WestJet
22 Dec - 30 Dec	Alaska Airlines
17 Dec - 27 Dec	WestJet
17 Dec - 06 Jan	Frontier Airlines
22 Dec - 01 Jan	Alaska Airlines

Also check the deals for one-way flights from Phoenix 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 Phoenix to Sydney in December from 967€

Return flights