AirHint found the following cheapest return flights from Washington (DCA) to Sydney (SYD) in January 2026 (see full year).

Return flights

21 Jan - 29 Jan	Frontier Airlines
22 Jan - 08 Feb	Alaska Airlines
14 Jan - 22 Jan	Frontier Airlines
26 Jan - 01 Feb	Hawaiian Airlines
12 Jan - 20 Jan	Hawaiian Airlines
29 Jan - 02 Feb	Hawaiian Airlines
14 Jan - 25 Jan	Frontier Airlines
12 Jan - 19 Jan	Hawaiian Airlines
10 Jan - 15 Jan	Hawaiian Airlines
11 Jan - 14 Jan	Hawaiian Airlines
15 Jan - 19 Jan	Frontier Airlines
20 Jan - 03 Feb	Cathay Pacific
09 Jan - 24 Jan	Frontier Airlines
01 Jan - 19 Jan	Delta
01 Jan - 01 Feb	United

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

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 January from $1422

Return flights