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

Return flights

18 Oct - 25 Oct	Air New Zealand
15 Oct - 29 Oct	Air New Zealand
06 Oct - 18 Oct	Frontier Airlines
15 Oct - 10 Nov	Air New Zealand
13 Oct - 20 Oct	Air New Zealand
24 Oct - 09 Nov	Air Canada
15 Oct - 22 Oct	United

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 $1320

Return flights