Sit on the Left side of the plane for the best views on flights from Kansas City to Seattle. Left side wins both ends of the flight. The Missouri River views on departure are solid, but the Mount Rainier and Cascade approach into SeaTac on the left side is the decisive factor — it is one of the best mountain approach views in the continental US.

During takeoff from Kansas City International (MCI), sit on the Left side for the best views. MCI typically departs runway 19L/19R heading south before turning northwest, or departs runway 1 heading north. On the dominant southward departure, the left side gets a clear view back over Kansas City's downtown skyline and the Missouri River bends. The river's distinctive meanders are easily spotted from low altitude. Notable sights include: Missouri River meanders, Kansas City downtown skyline, Kansas River confluence at Kaw Point, suburban grid of the metro spreading west into Kansas.

When landing at Seattle Tacoma International (SEA), sit on the Left side for the best views. SeaTac primarily lands on runways 16L/16R heading south, meaning the approach comes from the north over Puget Sound. The left side faces east and gets a direct, sustained view of Mount Rainier dominating the horizon, plus the full length of the Cascade Range. This is one of the most spectacular approach views in domestic aviation. Notable sights include: Mount Rainier, Cascade Range, Puget Sound, Lake Washington.

The flight from Kansas City International (MCI) to Seattle Tacoma International (SEA) takes Approximately 3 hours 30 minutes.

The flight tracks northwest over the Nebraska Sandhills, a visually distinctive landscape of grass-covered dunes and hundreds of small lakes and wetlands. Crossing into Wyoming, the Laramie Range and high plains are visible. The flight then crosses the Snake River Plain in southern Idaho, a broad flat volcanic plateau, before crossing the Blue Mountains of northeast Oregon and the Columbia River Gorge region before descending into Washington state over the Cascades.