Sit on the Left side of the plane for the best views on flights from Denver to Seattle. The left side delivers the most dramatic sustained scenery: the full Rocky Mountain Front Range on departure, then the Cascades of Washington state on the approach corridor, and the Columbia River valley visible mid-flight. The right side at landing is excellent but brief; the left side earns it over the full two-hour flight.

During takeoff from Denver International (DEN), sit on the Left side for the best views. DEN typically departs westbound on runway 16R/34L or uses runways oriented north-south. On a northwest-bound departure toward Seattle, the left (south) side gives you the Front Range of the Rockies including Pikes Peak and the Denver metro sprawl, while climbing out over the plains. As the aircraft turns northwest, the left side transitions to face the high Rockies directly. Notable sights include: Front Range of the Rocky Mountains, Pikes Peak (14,115 ft) to the south, Denver city grid and downtown skyline, Rocky Mountain foothills.

When landing at Boeing Fld King Co International (BFI), sit on the Right side for the best views. Flights from Denver to Boeing Field typically approach from the south or southeast, with BFI using runways oriented roughly north-south (13R/31L). On approach from the south, the right (west) side gives you Elliott Bay, the Seattle downtown skyline, and Puget Sound, while the left side faces the Cascades. Right side wins for the dramatic urban waterfront combination. Notable sights include: Elliott Bay and Puget Sound, Seattle downtown skyline, Lake Washington, Mount Rainier on the horizon to the southeast.

The flight from Denver International (DEN) to Boeing Fld King Co International (BFI) takes Approximately 2 hours 15 minutes.

Southern Idaho high desert and Snake River Plain, Boise visible to the north, Blue Mountains of northeastern Oregon, Columbia River Gorge region as the route descends toward the Pacific Northwest, Cascade Range foothills of Washington state