The flight distance from Boundary Airport (BYA) in Boundary, United States to St Louis Lambert International Airport (STL) in St Louis, United States is 4,321 kilometers (2,685 miles / 2,333 nautical miles). The estimated flight time for this route is approximately 6h, flying east southeast at a heading of 106°.

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 01:24 in Boundary, it's 04:24 in St Louis. The 3-hour time difference may cause some jet lag. Most travelers adjust within a day or two.

There is a significant elevation difference of 2,323 feet between the two airports. St Louis Lambert International Airport sits lower than Boundary Airport.

The return flight from St Louis (STL) to Boundary (BYA) follows a heading of 327° (north 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 Boundary Airport (BYA) and St Louis Lambert International Airport (STL) detail pages, or use our flight duration calculator to compare other routes.