AirHint found the following cheapest return flights from Chicago (ORD) to Sydney (SYD) in December 2026 (see full year).
Return flights
| 01 Dec - 18 Dec | Air Canada | ||
| 07 Dec - 11 Dec | Air Canada | ||
| 01 Dec - 23 Dec | ANA | ||
| 01 Dec - 08 Dec | ANA |
Also check the deals for one-way flights from Chicago to Sydney in December.
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