AirHint found the following cheapest return flights from Chicago (ORD) to Sydney (SYD) in March 2026 (see full year).

Return flights

09 Mar - 23 Mar	Frontier Airlines
03 Mar - 17 Mar	Frontier Airlines
03 Mar - 12 Mar	Qantas
07 Mar - 14 Mar	Alaska Airlines
15 Mar - 20 Mar	Qantas
15 Mar - 22 Mar	Etihad Airways
19 Mar - 26 Mar	Qantas
06 Mar - 20 Mar	Frontier Airlines
13 Mar - 20 Mar	Hawaiian Airlines
14 Mar - 22 Mar	Frontier Airlines
30 Mar - 11 Apr	Air Canada
27 Mar - 05 Apr	Air Canada
20 Mar - 05 Apr	Frontier Airlines
20 Mar - 04 Apr	American Airlines
21 Mar - 05 Apr	Air Canada

Also check the deals for one-way flights from Chicago to Sydney in March.

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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Cheapest return flights from Chicago to Sydney in March from $957

Return flights