Sit on the Left side of the plane for the best views on flights from Denver to Washington. Left side delivers the Rocky Mountain Front Range on departure and the Potomac River and DC monuments on arrival. The right side offers plains and generic suburban terrain for most of the flight. Left wins both ends decisively.

During takeoff from Denver International (DEN), sit on the Left side for the best views. DEN typically departs westbound on runways 16L/R or 25, then turns east toward IAD. A left/south-facing seat catches the Front Range of the Rockies as the aircraft climbs and banks. You get a clear view of the entire mountain wall from Pikes Peak in the south up through the Denver foothills. Notable sights include: Front Range of the Rocky Mountains, Pikes Peak (14,115 ft), Denver city grid and downtown skyline, Cherry Creek Reservoir.

When landing at Washington Dulles International (IAD), sit on the Left side for the best views. IAD approaches from the west or northwest on runways 01L/R or 19L/R. A left-seat passenger gets the Potomac River, the National Mall corridor, and the DC skyline on approach. The Capitol dome and Washington Monument are visible on the left side as you descend over Northern Virginia. Notable sights include: Potomac River, Washington DC National Mall and monuments, Dulles Access Road corridor, Blue Ridge Mountains on the western horizon.

The flight from Denver International (DEN) to Washington Dulles International (IAD) takes Approximately 3 hours 30 minutes.

The flight tracks east-northeast across the Great Plains of Kansas and Missouri, passing over the flat agricultural patchwork of western Kansas, the Missouri River valley near Kansas City, and the rolling terrain of Missouri and Illinois. The Ohio River valley marks the transition into the Appalachian foothills of West Virginia and western Virginia before descending into the DC metro area.