Cheapest return flights from Washington to Sydney in December from $1402

Best time to book flights for Washington (IAD) to Sydney (SYD) flights at AirHint

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

Return flights

09 Dec - 23 Dec Air New Zealand
09 Dec - 01 Jan Qantas
09 Dec - 31 Dec United
10 Dec - 01 Jan United
09 Dec - 10 Jan Qantas
10 Dec - 02 Jan Air New Zealand
24 Dec - 06 Jan Qantas
24 Dec - 10 Jan Qantas
24 Dec - 09 Jan Qantas
25 Dec - 06 Jan Qantas
25 Dec - 10 Jan Qantas
23 Dec - 10 Jan Delta
22 Dec - 30 Dec Air New Zealand

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

Skyscanner

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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