Sit on the Left side of the plane for the best views on flights from London to Denver. While the right side wins at Heathrow departure, the left side delivers the more spectacular payoff: the full Rocky Mountain Front Range panorama on approach to Denver is one of the most dramatic arrival views in commercial aviation. Across the Atlantic cruise the views are similar on both sides, but the left side also picks up the southern coast of Greenland's ice sheet and Labrador's fjord coastline during the transatlantic crossing.

During takeoff from Heathrow (LHR), sit on the Right side for the best views. Heathrow departures on the westbound runway 27L/27R head west, so the right (north) side gets a clear view over central London as the aircraft climbs and turns. You'll see the Thames snaking through the city, the dense urban grid of West London, and on clear days the Wembley arch is unmistakable. The left side faces south toward Surrey suburbs with far less to see. Notable sights include: River Thames through central London, Wembley Stadium arch, Windsor Castle and Windsor Great Park to the west, M25 motorway ring.

When landing at Denver International (DEN), sit on the Left side for the best views. Denver International sits east of the city, and aircraft typically approach from the east on runway 34L/34R heading northwest or on 26 heading west. On a northwest approach, the left (south/west) side delivers a stunning panorama of the entire Front Range — the Rocky Mountain wall stretching from Pikes Peak in the south to Longs Peak in the north. The right side faces northeast toward the flat plains with little of interest. Notable sights include: Front Range of the Rocky Mountains, Longs Peak and the Indian Peaks, Denver city skyline against the mountain backdrop, Cherry Creek Reservoir.

The flight from Heathrow (LHR) to Denver International (DEN) takes Approximately 9 to 10 hours.

The route tracks northwest from London over Ireland's west coast, then across the North Atlantic. Southern Greenland's ice cap and outlet glaciers are visible on clear days. The route crosses Labrador and Quebec's boreal forest, then the Great Lakes region may be visible to the south depending on exact routing. Over the US the route crosses the Missouri River basin and the flat Great Plains of Nebraska and Kansas before the Rockies appear on the horizon.