Cheapest return flights from Washington to Sydney in December from $1232

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

Return flights

02 Dec - 09 Dec American Airlines
04 Dec - 26 Dec American Airlines
09 Dec - 31 Dec Qantas
27 Dec - 19 Jan Air Canada
26 Dec - 11 Jan United
17 Dec - 05 Jan Air Canada
20 Dec - 02 Jan Frontier Airlines
19 Dec - 02 Jan Air New Zealand
19 Dec - 03 Jan Air New Zealand

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

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