The flight distance from Incheon International Airport (ICN) in Seoul, South Korea to St Mary's Airport (KSM) in St Mary'S, United States is 5,389 kilometers (3,348 miles / 2,910 nautical miles). The estimated flight time for this route is approximately 7h, flying northeast at a heading of 36°.

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 South Korea with United States. It is an intercontinental flight between Asia and North America. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 04:44 in Seoul, it's 10:44 in St Mary'S. With a 18-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 St Mary'S (KSM) to Seoul (ICN) follows a heading of 274° (west). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Incheon International Airport (ICN) and St Mary's Airport (KSM) detail pages, or use our flight duration calculator to compare other routes.