AirHint found the following cheapest return flights from Chicago (ORD) to Sydney (SYD) in March 2026 (see full year).
Return flights
| 19 Mar - 07 Apr | Qantas | ||
| 19 Mar - 06 Apr | Frontier Airlines | ||
| 18 Mar - 05 Apr | Spirit Airlines | ||
| 19 Mar - 05 Apr | Frontier Airlines | ||
| 14 Mar - 28 Mar | Frontier Airlines | ||
| 24 Mar - 30 Mar | Hawaiian Airlines |
Also check the deals for one-way flights from Chicago to Sydney in March.
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