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

Return flights

24 Oct - 09 Nov	Hawaiian Airlines
26 Oct - 31 Oct	Hawaiian Airlines
15 Oct - 29 Oct	Air New Zealand
01 Oct - 04 Oct	Fiji Airways
02 Oct - 08 Oct	Frontier Airlines
06 Oct - 20 Oct	Delta
02 Oct - 06 Oct	British Airways

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

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 October from $1358

Return flights