AirHint found the following cheapest return flights from Washington (DCA) to Sydney (SYD) in October 2025 (see full year).
Return flights
| 21 Oct - 29 Oct | Qantas | ||
| 26 Oct - 02 Nov | Delta | ||
| 29 Oct - 19 Nov | Delta | ||
| 21 Oct - 02 Nov | Delta | ||
| 22 Oct - 29 Oct | Delta | ||
| 19 Oct - 02 Nov | Delta | ||
| 24 Oct - 09 Nov | Delta | ||
| 31 Oct - 03 Nov | Delta | ||
| 20 Oct - 03 Nov | Qantas |
Also check the deals for one-way flights from Washington to Sydney in October.
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