AirHint found the following cheapest one-way flights from Washington (DCA) to Sydney (SYD) in December 2025 (see full year).
One-Way flights
| 04 Dec | Qantas | ||
| 06 Dec | Qantas | ||
| 15 Dec | Qantas | ||
| 19 Dec | Air Canada | ||
| 26 Dec | Qantas | ||
| 20 Dec | Fiji Airways | ||
| 18 Dec | Delta |
Also check the deals for return flights from Washington to Sydney in December.
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