AirHint found the following cheapest one-way flights from Chicago (ORD) to Sydney (SYD) in October 2025 (see full year).
One-Way flights
| 19 Oct | Qantas | ||
| 29 Oct | Frontier Airlines | ||
| 22 Oct | jetBlue | ||
| 25 Oct | Fiji Airways | ||
| 20 Oct | Cathay Pacific | ||
| 23 Oct | Cathay Pacific |
Also check the deals for return flights from Chicago to Sydney in October.
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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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