Sit on the Left side of the plane for the best views on flights from St. Louis to Denver. While takeoff favors the right side for the St. Louis riverfront view, the left side wins overall because the Front Range approach into Denver is a far more dramatic and sustained scenic feature, visible for many minutes during descent.

During takeoff from Lambert St Louis International (STL), sit on the Right side for the best views. Departing STL to the west, the right side offers a brief look back at the Gateway Arch and downtown St. Louis skyline along the Mississippi riverfront before the plane turns onto its westward heading. Left side shows mostly suburban sprawl. Notable sights include: Gateway Arch, Mississippi River, downtown St. Louis skyline, Missouri River confluence.

When landing at Denver International (DEN), sit on the Left side for the best views. On approach to Denver from the east, the left side faces south and west, giving a clear, sustained view of the Front Range of the Rockies rising abruptly from the plains, including peaks near Denver like Longs Peak and the foothills west of the city. This is the most dramatic terrain feature of the entire route. Notable sights include: Front Range of the Rocky Mountains, Longs Peak, Denver foothills, South Platte River valley.

The flight from Lambert St Louis International (STL) to Denver International (DEN) takes 2h 15m.

Flat agricultural plains of Kansas and eastern Colorado, with the Kansas and Republican River valleys visible below before the terrain rises toward the High Plains near Denver