Sit on the Right side of the plane for the best views on flights from Las Vegas to Barcelona. The right side wins overall due to the dramatic Las Vegas and Red Rock Canyon departure views, which are more visually striking than the landing approach. During the transatlantic cruise, both sides offer similar views over the Atlantic, but the right side also picks up southern Greenland's ice sheet and the Scottish Highlands depending on the exact routing, giving it a slight edge across the full flight.

During takeoff from Mc Carran International (LAS), sit on the Right side for the best views. LAS typically departs north on runway 19L/R or south on 01L/R. On a northeastbound departure toward BCN, aircraft climb out heading roughly northeast, putting the Las Vegas Strip and downtown Las Vegas on the right side, with Red Rock Canyon's sandstone escarpment visible to the right as you gain altitude. The Spring Mountains and Charleston Peak also appear to the right during the turn. Notable sights include: Las Vegas Strip (hotels visible from low altitude), Red Rock Canyon escarpment, Spring Mountains/Charleston Peak (11,918 ft), Lake Mead to the northeast.

When landing at Barcelona (BCN), sit on the Left side for the best views. Barcelona's El Prat airport typically lands on runway 25L/R from the east, meaning aircraft approach from the Mediterranean Sea heading west. The left side gives a clear view of the Barcelona coastline, the city grid including the Eixample district, and the Montjuic hill. The right side faces inland toward flat delta terrain. Notable sights include: Barcelona coastline and beaches, Eixample city grid, Montjuic hill, Llobregat River delta.

The flight from Mc Carran International (LAS) to Barcelona (BCN) takes Approximately 11 to 12 hours.

After departing Nevada, the route crosses the Colorado Plateau and Rocky Mountains, then the Great Plains before reaching the US East Coast near New York or Boston. The North Atlantic crossing passes near Newfoundland, then tracks over the open ocean. Depending on routing, southern Greenland's ice cap may be visible. The European landfall is typically over Ireland or southwestern England, then across France before descending into Catalonia.