Sit on the Left side of the plane for the best views on flights from Frankfurt to Seattle. Left side wins both the departure and arrival phases. During the transatlantic crossing the view differences are minimal over open ocean and Canadian wilderness, but the left side also offers slightly better angles over southern Greenland's ice sheet and the Canadian Rockies on the polar routing. The Mount Rainier view on approach is the single best moment of the flight.

During takeoff from Frankfurt Main (FRA), sit on the Left side for the best views. Frankfurt's main departure runway 25L/C sends aircraft westbound, putting the left side facing south over the Rhine-Main region. You get a clear view of the Rhine River bending south toward Mainz and the Taunus hills rising to the north. The city of Frankfurt's skyline is briefly visible behind and to the left before you climb out over the Rheingau. Notable sights include: Rhine River near Mainz confluence, Frankfurt city skyline (briefly), Taunus hills, Wiesbaden urban area.

When landing at Seattle Tacoma International (SEA), sit on the Left side for the best views. SeaTac primarily uses runways 16L/16R for southbound landings, meaning the approach comes from the north over Puget Sound. The left side faces east, giving a direct view of Mount Rainier dominating the horizon and the Cascade Range extending north and south. The right side faces west over Puget Sound and the Olympic Peninsula, which is also scenic, but Rainier is the more dramatic single landmark. Notable sights include: Mount Rainier, Cascade Range, Lake Washington, Seattle city skyline.

The flight from Frankfurt Main (FRA) to Seattle Tacoma International (SEA) takes Approximately 10 to 11 hours.

The great circle route from Frankfurt to Seattle passes over the Netherlands and North Sea coast, then across southern Norway or Scotland depending on winds, out over the North Atlantic, across southern Greenland's ice cap and fjord coastline, over Baffin Island and Hudson Bay, across the Canadian boreal forest of Manitoba and Saskatchewan, over the Canadian Rockies in British Columbia, and then descending over the Cascade Range into Seattle. Greenland's ice sheet and the Canadian Rockies are the most visually striking midpoint features.