Sit on the Right side of the plane for the best views on flights from Boston to Seattle. The right side wins overall. While left is better at Boston departure, the right side captures the northern Rockies and Cascades during cruise, and delivers the spectacular Puget Sound and Olympic Mountains approach into SeaTac. Across the full flight, right provides more sustained geographic interest including the Cascades crossing and the final approach scenery.

During takeoff from General Edward Lawrence Logan International (BOS), sit on the Left side for the best views. Logan's primary eastward departures off Runway 33L/22R swing the aircraft north and west over the city. The left side captures Boston Harbor, the downtown skyline, and the Charles River basin as you climb out. Right side faces the open Atlantic with little of interest. Notable sights include: Boston Harbor and its islands, downtown Boston skyline including the Prudential and Hancock towers, Charles River and Cambridge, Mystic River and Chelsea waterways.

When landing at Seattle Tacoma International (SEA), sit on the Right side for the best views. SeaTac primarily lands from the north on Runways 16L/16R, meaning the aircraft approaches from the north heading south. The right side faces west toward Puget Sound, the Olympic Peninsula, and on clear days the Olympic Mountains. The left side looks east toward the Cascades but is partially obscured by the fuselage angle during final approach. Notable sights include: Puget Sound and its island-dotted waters, Elliott Bay and downtown Seattle skyline, Olympic Mountains across the sound, Vashon Island below.

The flight from General Edward Lawrence Logan International (BOS) to Seattle Tacoma International (SEA) takes Approximately 5 hours 30 minutes to 6 hours.

The flight tracks across upstate New York and the Great Lakes region, then over the northern Great Plains of Minnesota and North Dakota. The Missouri River drainage and Montana high plains follow. The most dramatic section is the crossing of the northern Rocky Mountains over Montana and Idaho, where the Bitterroot Range and Clearwater Mountains are visible. The Cascades crossing over Washington state precedes descent, with Mount Rainier visible to the south as a dominant snow-capped volcanic cone and Mount Adams further south on the horizon.