AirHint found the following cheapest return flights from Washington (IAD) to Sydney (SYD) in October 2025 (see full year).
Return flights
| 22 Oct - 29 Oct | Delta | ||
| 22 Oct - 10 Nov | Delta | ||
| 22 Oct - 03 Nov | Delta | ||
| 29 Oct - 12 Nov | Delta | ||
| 26 Oct - 02 Nov | Delta | ||
| 23 Oct - 10 Nov | Delta | ||
| 24 Oct - 09 Nov | Delta | ||
| 26 Oct - 09 Nov | Turkish Airlines |
Also check the deals for one-way flights from Washington to Sydney in October.
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