Are there nonstop flights from Chicago (ORD) to Sydney (SYD)?

No. The fastest connection is via Los Angeles, about 18h 29m of total flying time.

What is the fastest connection from Chicago (ORD) to Sydney (SYD)?

via Los Angeles ≈ 18h 29m, via San Francisco ≈ 18h 33m, via Honolulu ≈ 18h 38m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 47,000 JAL miles (economy, one way, based on the published award charts).

Chicago O'Hare International Airport (ORD) to Sydney Kingsford Smith International Airport (SYD)・14,862 km

No nonstop flights. The fastest connection is via Los Angeles (LAX), about 18h 29m of flying time (layover not included).

With milesANA 30,000 miles+ (via HND)JAL 47,000 miles+ (via LAX)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

20 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.