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It depends where in the USA you are departing from and where in Australia you are landing. A typical flight between US and Perth, Australia would have a flying time of about 18 hours, 57 minutes. This assumes an average air speed for a commercial airliner of 500 mph, which is equivalent to 805 km/hr or 434 knots. Your exact flight time may vary depending on wind speeds.

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16y ago

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