Sit on the Left side of the plane for the best views on flights from Frankfurt to Keflavik. The left side wins overall because the takeoff view over Frankfurt, the Main River, and the Taunus is genuinely rewarding, and during the cruise over Scotland and the North Atlantic the left side faces south toward the Scottish Highlands and later the Faroe Islands. The right-side landing advantage at Keflavik is real but shorter in duration than the cumulative left-side benefits during climb and cruise.

During takeoff from Frankfurt Main (FRA), sit on the Left side for the best views. Frankfurt typically departs westbound on runway 07L/25R or northwestbound on 18. A left-side seat during westbound departure gives you a clear view over Frankfurt city center, the Main River bends, and the Taunus hills to the north. As the aircraft turns northwest toward Iceland, the left side continues to face the more interesting terrain. Notable sights include: Frankfurt city center and Sachsenhausen skyline, Main River bends west of the airport, Taunus hills ridge to the north, Rhine River valley visible as you climb through 8,000-12,000 ft.

When landing at Keflavik Nas (KEF), sit on the Right side for the best views. Keflavik sits on the Reykjanes Peninsula and aircraft typically approach from the east or southeast on runway 28 or 19. A right-side seat on approach gives you views over Reykjavik, Faxafloi Bay, and Mount Esja across the water. The left side faces mostly open Atlantic and the barren lava fields of the peninsula interior. Notable sights include: Reykjavik city and harbor across Faxafloi Bay, Mount Esja (914m) rising behind Reykjavik, Reykjanes lava fields and geothermal steam plumes, Faxafloi Bay itself.

The flight from Frankfurt Main (FRA) to Keflavik Nas (KEF) takes Approximately 3 hours 15 minutes to 3 hours 45 minutes.

The flight tracks northwest over the Ruhr region, then across the Netherlands coast near the Wadden Sea, over the North Sea, crossing Scotland near Inverness and the northern Highlands, then out over the North Atlantic passing within range of the Faroe Islands (roughly 100-150 miles to the left), before descending toward the Reykjanes Peninsula. The Scottish Highlands crossing around 35,000 ft offers the most visually dramatic terrain of the cruise phase, with the Great Glen and Cairngorms visible on clear days.