Sit on the Left side of the plane for the best views on flights from Washington to St. Louis. Left seats capture the most scenic departure over Washington DC and the Potomac River, which outweighs the landing advantage of right seats. The westbound flight path offers limited dramatic midpoint scenery, making the takeoff experience the primary visual highlight.

During takeoff from Washington Dulles International (IAD), sit on the Left side for the best views. Left seats offer views of the Potomac River and Washington DC landmarks during the initial climb westward. Right seats face away from the city toward Virginia's rural terrain. Notable sights include: Potomac River, Washington Monument and Capitol Building area, Arlington County urban grid, Blue Ridge Mountains (distant western horizon).

When landing at Lambert St Louis International (STL), sit on the Right side for the best views. Right seats provide excellent views of the Mississippi River and St. Louis's urban core during the descent and approach from the east. The Gateway Arch and downtown skyline are visible on approach. Notable sights include: Mississippi River, St. Louis downtown and Gateway Arch, Illinois bluffs east of the river, Missouri River confluence (distant).

The flight from Washington Dulles International (IAD) to Lambert St Louis International (STL) takes 1h 15m.

The flight crosses the Appalachian foothills and ridge-and-valley terrain of West Virginia and eastern Kentucky. The New River Gorge and Kanawha River valley are visible from altitude on clear days. The landscape transitions from the Blue Ridge Mountains near Washington to rolling forested terrain, with scattered small towns and mining areas visible. No major dramatic landmarks dominate the midpoint—the terrain is primarily forested ridges and valleys with limited urban development.