Sit on the Left side of the plane for the best views on flights from Denver to Frankfurt. Left side wins at both ends of the flight. The Rocky Mountain Front Range on departure is one of the most dramatic views in North American aviation, and the Frankfurt approach on the left gives you the Rhine, the Main, and the city skyline. For the oceanic crossing, neither side has a significant advantage, but the left side also offers better views of Greenland's ice sheet and Iceland if the routing passes near them, which transatlantic flights from Denver frequently do.

During takeoff from Denver International (DEN), sit on the Left side for the best views. DEN typically departs westbound on runway 16L/34R or uses east-west runways. On a transatlantic routing heading northeast, a left-side seat gives you the Rocky Mountain Front Range — the entire stretch from Pikes Peak in the south to Longs Peak in the north — as the aircraft climbs and turns northeast. The urban grid of Denver itself also passes beneath on the left. Notable sights include: Rocky Mountain Front Range (Pikes Peak to Longs Peak), Denver city grid and downtown skyline, Cherry Creek Reservoir, South Platte River corridor.

When landing at Frankfurt Main (FRA), sit on the Left side for the best views. Frankfurt airport typically lands from the west on runways 07L/07R, meaning the approach comes in over the Rhine-Main region from the west. A left-side seat on approach gives you the Rhine River, the Frankfurt city skyline, and the Taunus hills to the north. The right side faces south toward flat agricultural land. Notable sights include: Rhine River and its broad bends, Frankfurt am Main skyline (Bankenviertel towers), Taunus hills to the north, Main River confluence with the Rhine near Mainz.

The flight from Denver International (DEN) to Frankfurt Main (FRA) takes Approximately 9 to 10 hours.

After crossing the Great Plains and the Upper Midwest (Mississippi River visible on clear days), the route typically tracks over eastern Canada — Hudson Bay or the Gulf of St. Lawrence depending on the jet stream. The southern tip of Greenland with its ice sheet and fjords is often visible. Depending on the North Atlantic Track system routing, Iceland or the Faroe Islands may appear. The flight then crosses Scotland or Ireland before descending over the North Sea and into Central Europe over the Netherlands or Belgium.