Sit on the Left side of the plane for the best views on flights from London to Keflavik. The takeoff right-side advantage is modest — suburban London and the Thames are pleasant but not dramatic. The left side wins overall because the approach into Keflavik over the Reykjanes lava fields and the Atlantic coastline is genuinely striking, and during the cruise the left side faces south toward the open North Atlantic with occasional views of the Scottish coastline and Faroe Islands in the distance.

During takeoff from Heathrow (LHR), sit on the Right side for the best views. Heathrow typically departs westbound on runways 27L/27R, so a right-side seat looks north over the Thames valley, Windsor, and the western suburbs of London during climb-out. You get a clear view of the river bending through the landscape and the urban sprawl giving way to the Chilterns. Notable sights include: River Thames bend near Windsor, Windsor Castle and Great Park, Slough and western London suburbs, Chiltern Hills escarpment to the north.

When landing at Keflavik Nas (KEF), sit on the Left side for the best views. Keflavik typically lands on runway 28 or 10, approaching from the east over the Reykjanes Peninsula. A left-side seat on approach gives you the view south toward the Atlantic and the volcanic lava fields of Reykjanes, while on a runway 10 approach from the west, the left side looks toward Reykjavik and Faxaflói Bay. Either way, the left side captures the dramatic volcanic terrain and coastal scenery of the peninsula. Notable sights include: Reykjanes lava fields and volcanic terrain, Faxaflói Bay and Reykjavik in the distance, Atlantic Ocean coastline of the peninsula, geothermal steam plumes near Svartsengi (Blue Lagoon area).

The flight from Heathrow (LHR) to Keflavik Nas (KEF) takes Approximately 2 hours 45 minutes to 3 hours.

After departing northwest over the UK, the route crosses northern Scotland and the Orkney or Shetland Islands, then tracks across the open North Atlantic. The Faroe Islands may be visible on the left (south) side roughly 90 minutes in as small dark specks in the grey ocean. The final approach crosses the volcanic Reykjanes Peninsula with its distinctive black lava fields and geothermal activity.