Sit on the Left side of the plane for the best views on flights from Seattle to Toronto. Left side wins both ends of the flight. During the flight itself, the left side also faces south toward the U.S. Rockies and Great Plains as the route tracks northeast across British Columbia, Alberta, and Saskatchewan, offering occasional views of the Canadian Rockies in the distance during the first hour of cruise.

During takeoff from Seattle Tacoma International (SEA), sit on the Left side for the best views. SEA primarily uses runways 16L/16R for southbound departures, then aircraft turn northeast toward Canada. A left-side seat captures Elliott Bay, downtown Seattle, and the Olympic Mountains across Puget Sound during the initial climb and turn. The right side faces east toward the Cascades but the turn geometry puts the best urban and water views on the left. Notable sights include: Elliott Bay and downtown Seattle skyline, Puget Sound, Olympic Mountains (across the Sound to the west), Lake Washington.

When landing at Lester B Pearson International (YYZ), sit on the Left side for the best views. Pearson typically uses runways 05/23 or 06L/06R, with westbound arrivals often on runway 23 or 24L approaching from the east. A left-side seat on approach from the east gives a clear view of Lake Ontario, the Toronto downtown skyline including the CN Tower, and the waterfront. The right side faces north toward suburban sprawl with fewer distinctive features. Notable sights include: Lake Ontario, Toronto downtown skyline and CN Tower, Toronto Islands, Niagara Peninsula (visible to the southwest on clear days).

The flight from Seattle Tacoma International (SEA) to Lester B Pearson International (YYZ) takes Approximately 4 hours 15 minutes to 4 hours 45 minutes.

The route tracks northeast from Seattle across the Cascade Range, then over the interior of British Columbia, crossing the Canadian Rockies near Jasper or Banff (visible as a dramatic snow-covered mountain wall from cruise altitude), then flattening out over the Alberta and Saskatchewan prairies — a vast patchwork of agricultural grid squares. The route then crosses Manitoba and northwestern Ontario, passing over boreal forest, the Canadian Shield's exposed granite and countless lakes, before descending into the Great Lakes region over Lake Huron and Georgian Bay.