Cheapest return flights from Washington to Sydney in December from $1100

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

Return flights

04 Dec - 14 Dec Frontier Airlines
02 Dec - 13 Dec Frontier Airlines
30 Dec - 12 Jan United
04 Dec - 26 Dec Air New Zealand
27 Dec - 19 Jan Korean Air
26 Dec - 11 Jan Cathay Pacific
23 Dec - 30 Dec United
17 Dec - 11 Jan Frontier Airlines
17 Dec - 05 Jan Cathay Pacific
22 Dec - 04 Jan Hawaiian Airlines

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

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