Sit on the Right side of the plane for the best views on flights from Boston to Seattle. Left wins at takeoff for the Boston Harbor and skyline views, but right side delivers more consistently across the full flight — the northern Rockies and Cascades are better framed on the right heading westbound, and the Seattle approach from the right is genuinely spectacular with Elliott Bay and the Olympics. Right edges it overall.

During takeoff from General Edward Lawrence Logan International (BOS), sit on the Left side for the best views. Logan's most common westbound departures use runway 22L/22R heading southwest, then turning northwest. The left side gets Boston Harbor, the downtown skyline, and the Charles River basin as you climb out over the city. Right side faces south toward the open Atlantic with less to see. Notable sights include: Boston Harbor and its islands, downtown Boston skyline including the Prudential and Hancock towers, Charles River and Cambridge, Fenway Park neighborhood grid.

When landing at Boeing Fld King Co International (BFI), sit on the Right side for the best views. BFI sits just south of downtown Seattle, and aircraft typically approach from the south or southeast over the Duwamish industrial valley. The right side faces west toward Elliott Bay, the Seattle skyline, and Puget Sound with the Olympic Mountains on the far horizon — one of the most dramatic urban approach views in the US. Notable sights include: Elliott Bay and Puget Sound, Seattle downtown skyline including the Space Needle, Olympic Mountains across the Sound, Duwamish River industrial waterway.

The flight from General Edward Lawrence Logan International (BOS) to Boeing Fld King Co International (BFI) takes Approximately 5 hours 30 minutes to 6 hours.

The flight tracks roughly along the 45th parallel westbound. Notable features include the Great Lakes region near the northern tip of Lake Michigan, then the flat agricultural plains of Minnesota and South Dakota, the Missouri River breaks, the dramatic badlands and high plains of Montana, the northern Rocky Mountain ranges including the Bitterroot and Clearwater ranges over Idaho, and finally the Cascade Range with Mount Rainier prominently visible on descent into Seattle