The right side wins mainly on the strength of the Front Range mountain view during climb-out, since the long cruise over Kansas and Missouri farmland is flat and largely featureless on both sides; the left side's Arch and river view on landing is a nice but brief bonus that doesn't match the mountain drama.
Flown DEN to STL? Did we get it right?
Flight Path
Denver to St. Louis is 768 miles (1,236 km), a flight of about 2 hours 10 minutes.
Flat wheat and corn farmland of eastern Colorado, Kansas, and northern Missouri, with the Missouri River crossed roughly around the Kansas City area partway through the route
Great circle distance and headings ›Phase by phase

Takeoff from DEN
RIGHTDEN's departures often use the south-facing 17-series runways before turning east; during that turn the Front Range and the snow-capped peaks west of Denver swing across the right-side windows for a couple of minutes before the plane settles onto its eastbound cruise track.

Landing at STL
LEFTOn the descent into STL from the west, the final approach path passes just north of downtown, putting the Gateway Arch, the Mississippi River, and the St. Louis skyline into view on the left side of the aircraft.
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About This Route
Which side of the plane should I sit on flying from Denver International (DEN) to Lambert St Louis International (STL)?
Sit on the Right side of the plane for the best views on flights from Denver to St. Louis. The right side wins mainly on the strength of the Front Range mountain view during climb-out, since the long cruise over Kansas and Missouri farmland is flat and largely featureless on both sides; the left side's Arch and river view on landing is a nice but brief bonus that doesn't match the mountain drama.
What can I see during takeoff from Denver International in Denver?
During takeoff from Denver International (DEN), sit on the Right side for the best views. DEN's departures often use the south-facing 17-series runways before turning east; during that turn the Front Range and the snow-capped peaks west of Denver swing across the right-side windows for a couple of minutes before the plane settles onto its eastbound cruise track. Notable sights include: Front Range foothills, Longs Peak area, Denver's northern suburbs, South Platte River valley.
What can I see when landing at Lambert St Louis International in St. Louis?
When landing at Lambert St Louis International (STL), sit on the Left side for the best views. On the descent into STL from the west, the final approach path passes just north of downtown, putting the Gateway Arch, the Mississippi River, and the St. Louis skyline into view on the left side of the aircraft. Notable sights include: Gateway Arch, Mississippi River, downtown St. Louis skyline, Eads Bridge.
How long is the flight from Denver to St. Louis?
The flight from Denver International (DEN) to Lambert St Louis International (STL) takes about 2 hours 10 minutes. The shortest flight path between them is 768 miles (1,236 km); winds and air traffic control usually add a few percent.
What does the Denver to St. Louis flight path pass over?
Flat wheat and corn farmland of eastern Colorado, Kansas, and northern Missouri, with the Missouri River crossed roughly around the Kansas City area partway through the route