AirHint found the following cheapest one-way flights from Chicago (ORD) to Sydney (SYD) in December 2025 (see full year).
One-Way flights
| 08 Dec | Hawaiian Airlines | ||
| 12 Dec | Frontier Airlines | ||
| 16 Dec | Air Canada | ||
| 23 Dec | Air Canada | ||
| 22 Dec | Fiji Airways |
Also check the deals for return flights from Chicago to Sydney in December.
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