The flight distance from George Bush Intcntl/Houston Airport (IAH) in Houston, United States to St Mary's Airport (KSM) in St Mary'S, United States is 5,957 kilometers (3,702 miles / 3,217 nautical miles). The estimated flight time for this route is approximately 8h, flying north northwest at a heading of 327°.

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 a domestic route within United States. Both airports operate in the same country, which may simplify travel requirements and documentation. Despite being a domestic route, there is a 3-hour time difference between the two cities.

Time zone information: When it's 22:30 in Houston, it's 19:30 in St Mary'S. The 3-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

The return flight from St Mary'S (KSM) to Houston (IAH) follows a heading of 94° (east). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the George Bush Intcntl/Houston Airport (IAH) and St Mary's Airport (KSM) detail pages, or use our flight duration calculator to compare other routes.