✈ ORD → SYD
18H 27M IN ECONOMY = A FELONY AGAINST YOURSELF. UPGRADE.
Flight from Chicago to Sydney
From O'Hare (ORD), USA North America → Kingsford Smith (SYD), Australia Oceania
How long is the flight from Chicago to Sydney?
A nonstop flight from Chicago (ORD) to Sydney (SYD) takes about 18 hours 27 minutes, covering a great-circle distance of 9,235 miles (14,862 km). Actual scheduled time varies by airline, routing, and wind — expect ±15 to 30 minutes from this estimate.
Avg flight time
18h 27m
Nonstop, scheduled
Distance
9,235 mi
14,862 km · great-circle
Avg speed
806 km/h
Door-to-door including taxi
Time zones & jet lag
Chicago timezone
UTC-5
America/Chicago
Sydney timezone
UTC+10
Australia/Sydney
Time difference
+15h
15 hours ahead
Jet lag (rough)
~15d
Eastward — worse
CO₂ footprint per passenger
Economy class, single passenger. Source: DEFRA 2024 averages.
This flight emits roughly 3.6× the CO₂ of an equivalent train trip and 0.9× a car driven alone over the same distance.