The flight from Seattle (SEA) to Sydney (Mascot) (SYD) takes about 14h 5m nonstop on a widebody airliner, covering 7,750 miles (12,472 km).
Sydney (Mascot) is 17 hours ahead of Seattle. You cross 17 time zones heading east. Eastbound trips like this one tend to be harder to adjust to, so plan for a day or two of jet lag.
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