Cheapest return flights from Philadelphia to Sydney in December from $1646

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

Return flights

28 Dec - 31 Jan United
28 Dec - 30 Jan United
27 Dec - 10 Jan United
24 Dec - 30 Jan Air Canada
23 Dec - 31 Jan Air Canada
19 Dec - 10 Jan Frontier Airlines
21 Dec - 30 Jan Qatar Airways
21 Dec - 31 Jan Qatar Airways
22 Dec - 31 Jan Hawaiian Airlines
22 Dec - 30 Jan Hawaiian Airlines
16 Dec - 23 Dec Japan Airlines

Also check the deals for one-way flights from Philadelphia to Sydney in December.

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