Distance From Boulder Airport to Sydney Kingsford Smith International Airport

The distance from Boulder Airport () to Sydney Kingsford Smith International Airport (SYD) is 8157 miles or 13127 kilometers or 7083 nautical miles.

The distance shown below is direct flight distance between airports. Straight-line distance does not account for the surface between the two points. It is the distance a bird or airplane would travel between the two points when flying above the surface. The straight line distance is the direct route between two points, regardless of whether or not there are roads that connect them.

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How long does it take to travel from Boulder ( United States ) to Sydney ( Australia )?

A one-way nonstop (direct) flight between Boulder and Sydney takes around 18 hours 45 minutes.

Estimated flight time from Boulder Airport, Boulder, United States to Sydney Kingsford Smith International Airport, Sydney, Australia is 18 hours 45 minutes under avarage conditions. Your actual flying time may vary depending on wind direction/speed or weather conditions. This calculation does not include the departure and landing times of the aircraft. In addition, it does not cover the person identity check, ticket check-in and baggage collection times at the airport.

Travel Distance Between the Airports • - SYD

Kilometers		13127 km
Statute Miles		8157 miles
Nautical Miles		7083 nm
Avg. Time of Flight		18 hours 45 minutes

Boulder Airport to Sydney Kingsford Smith International Airport Flight Route Map - to SYD Flight Path

Location of Boulder Airport & Sydney Kingsford Smith International Airport is given below.
Click the map to view Boulder to Sydney nonstop flight path and travel direction.

Click to see flight route on Google Map between Boulder, United States and Sydney, Australia. .

Nonstop flight route between Boulder, United States and Sydney, Australia.

Time Difference Between the Airports • - SYD

Time difference between Boulder (United States) and Sydney (Australia) is 16 Hours.
Sydney time is 16 Hours ahead of Boulder.

Location	Local Time
Boulder (United States)	2026-09-17, 11:52:00 MDT
Sydney (Australia)	2026-09-18, 03:52:00 AEST

Why should you arrive 3 hours before international flight? Flyers who are traveling to an international destination should arrive at the airport earlier than domestic flyers. This is because international flights can have additional check-in requirements, like passport verification, that need to be completed before you receive your boarding pass.

Origin

Boulder Airport ( / 3U9) Boulder, United States

Destination

Sydney Kingsford Smith International Airport (SYD / YSSY) Sydney, Australia