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

Return flights

03 Mar - 10 Mar	Frontier Airlines
03 Mar - 20 Mar	Frontier Airlines
06 Mar - 20 Mar	Frontier Airlines
19 Mar - 29 Mar	Frontier Airlines
12 Mar - 28 Mar	Hawaiian Airlines
15 Mar - 31 Mar	Etihad Airways
14 Mar - 22 Mar	Frontier Airlines
14 Mar - 28 Mar	Spirit Airlines
19 Mar - 31 Mar	Frontier Airlines
20 Mar - 29 Mar	Frontier Airlines
30 Mar - 11 Apr	Frontier Airlines
30 Mar - 10 Apr	Air Canada
29 Mar - 20 Apr	Qantas
21 Mar - 05 Apr	Air Canada
28 Mar - 18 Apr	Qantas
27 Mar - 17 Apr	Air Canada
27 Mar - 18 Apr	Air Canada
15 Mar - 01 Apr	Qantas
25 Mar - 01 Apr	Qantas
20 Mar - 04 Apr	Frontier Airlines

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 743€

Return flights