AirHint found the following cheapest return flights from Chicago (ORD) to Sydney (SYD) in April 2026 (see full year).
Return flights
| 01 Apr - 19 Apr | Cathay Pacific | ||
| 08 Apr - 25 Apr | Cathay Pacific | ||
| 02 Apr - 06 Apr | Air Canada | ||
| 17 Apr - 02 May | Air Canada |
Also check the deals for one-way flights from Chicago to Sydney in April.
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