The flight distance from San Francisco International Airport (SFO) in San Francisco, United States to Union Island International Airport (UNI) in Union Island, Saint Vincent is 6,611 kilometers (4,108 miles / 3,569 nautical miles). The estimated flight time for this route is approximately 9h, flying east at a heading of 98°.

This is a long-haul route typically operated by wide-body aircraft such as the Boeing 777 or Airbus A350. Full meal service, in-flight entertainment, and comfort amenities are standard.

This is an international route connecting United States with Saint Vincent. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 14:26 in San Francisco, it's 18:26 in Union Island. The 4-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

The return flight from Union Island (UNI) to San Francisco (SFO) follows a heading of 306° (northwest). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

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