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	Hawaiian Airlines
02 Dec - 13 Dec	Fiji Airways
30 Dec - 12 Jan	United
09 Dec - 23 Dec	Fiji Airways
04 Dec - 26 Dec	Frontier Airlines
27 Dec - 19 Jan	Korean Air
23 Dec - 30 Dec	United
26 Dec - 11 Jan	Frontier Airlines
17 Dec - 11 Jan	Frontier Airlines
24 Dec - 31 Dec	Qantas
17 Dec - 05 Jan	Hawaiian Airlines
19 Dec - 31 Dec	Delta
29 Dec - 02 Jan	Qantas
10 Dec - 08 Jan	British Airways
24 Dec - 03 Jan	British Airways

Also check the deals for one-way flights from Washington 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 Washington to Sydney in December from 1215€

Return flights