The flight distance from Sydney Kingsford Smith International Airport (SYD) in Sydney, Australia to Union Island International Airport (UNI) in Union Island, Saint Vincent is 15,957 kilometers (9,915 miles / 8,616 nautical miles). The estimated flight time for this route is approximately 20h, flying east southeast at a heading of 118°.

This is an ultra-long-haul route, one of the longest in aviation. It requires wide-body aircraft with extended range capability such as the Airbus A350-900ULR or Boeing 777-200LR. Passengers should prepare for an extended flight with multiple meal services.

This is an international route connecting Australia with Saint Vincent. It is an intercontinental flight between Oceania and North America. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 15:43 in Sydney, it's 00:43 in Union Island. With a 15-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

The return flight from Union Island (UNI) to Sydney (SYD) follows a heading of 229° (southwest). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Sydney Kingsford Smith International Airport (SYD) and Union Island International Airport (UNI) detail pages, or use our flight duration calculator to compare other routes.