Cheapest return flights from Chicago to Sydney in October from 820€

AirHint found the following cheapest return flights from Chicago (ORD) to Sydney (SYD) in October 2025 (see full year).

Return flights

22 Oct - 24 Oct Alaska Airlines
22 Oct - 31 Oct Alaska Airlines
28 Oct - 04 Nov Korean Air
27 Oct - 17 Nov Frontier Airlines
18 Oct - 26 Oct Frontier Airlines
07 Oct - 25 Nov Hawaiian Airlines
23 Oct - 07 Nov Fiji Airways
24 Oct - 26 Oct Turkish Airlines
09 Oct - 20 Nov United
12 Oct - 23 Nov United

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

Skyscanner

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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