VARIESThe path tells you which side
Every route follows a great circle — the shortest path on a sphere. That arc determines which landmarks fall on which side of the cabin.
Pull up your flight on a tracking app and the route looks curved. Los Angeles to London goes over Greenland. Chicago to Tokyo passes near Alaska. It seems wrong until you hold a string taut between those cities on a globe. The string follows the same path the plane does.
That path is called a great circle. It's the shortest distance between two points on a sphere, and it almost never looks like a straight line on the flat maps we're used to. Airlines figured this out early. The physics of fuel burn made the decision for them.
What makes this relevant to your window seat: the arc of the path determines which side of the cabin faces which geography. On a London to Los Angeles flight, the great circle swings north over Iceland and Greenland, so left-side passengers get the ice sheet. From Chicago to Tokyo, the polar route puts the Aleutian Islands on the left. These aren't coincidences. They're built into the geometry.
Want the specific left-or-right answer for your flight?
Look up my route →Great circles on a flat map
A Mercator projection stretches the poles. Greenland looks the size of Africa. A "straight" line on this map between London and LA would cross the mid-Atlantic, missing Iceland entirely. But that line covers about 500 more miles than the great circle route that passes over Iceland.
Pilots and dispatchers plan along the great circle, then adjust. Jet streams push eastbound flights further north in winter. Restricted airspace carves detours. Volcanic ash or weather systems force reroutes. The filed flight plan is the great circle, negotiated with reality.
For your window seat, the filed plan is what matters. The adjustments rarely shift the route far enough to move a landmark from one side of the cabin to the other.
Why this matters corridor by corridor
Some corridors have geometry that strongly favors one side. Others split the difference. Here's how the major long-haul paths break down.
Transatlantic
The great circle from the US East Coast to Western Europe arcs through the North Atlantic, passing near or over Newfoundland, southern Greenland, and Iceland. Eastbound flights ride the jet stream and tend to track even further north. This puts the best geography on the left side outbound from the US. The JFK to London route is the textbook example: left side for Greenland on the way over, left side for the English countryside on approach into Heathrow.
Transpacific
US-to-Japan flights from San Francisco and Seattle arc far north, sometimes passing within sight of the Aleutian Islands. Left wins on these routes for the Alaska coast and the Aleutian chain. But from Los Angeles, the routing swings the departure views to the right side, where the LA basin and coastline spread out below. The path geometry flips the answer depending on which West Coast city you leave from.
US transcontinental
Coast-to-coast flights stay at mid-latitudes, so the great circle effect is smaller. The scenery question comes down to which geographic features the route crosses and at what angle. JFK to LAX passes south of the Grand Canyon on most routings. SFO to JFK crosses the Sierra Nevada and the Rockies. The terrain is different enough on each routing that the answer changes with the city pair.
US to Hawaii
These routes head southwest from the West Coast over open Pacific for most of the flight. The departure and arrival views carry all the scenic weight. From LA, the right side gets the coastline on climbout. Arriving in Honolulu, the left side faces Diamond Head and Waikiki. On a five-hour flight with four hours of empty ocean in the middle, the first and last twenty minutes make the call.
Polar routes
Flights between North America and East Asia often fly near or over the North Pole. Chicago to Tokyo is a classic polar routing. The great circle from O'Hare to Narita passes close to the Aleutian chain and sometimes clips the edge of the Arctic. These flights are shorter than you'd expect because the pole is closer than the equator to both cities on the globe.
Polar routes give passengers on the left side views of the Aleutian Islands and parts of Alaska's coastline that are otherwise hard to see. The volcanic peaks of the chain are striking from cruise altitude when the weather cooperates.
What else shifts a flight path
Great circles set the baseline, but several forces bend the actual track:
- Jet streams can add 100+ mph of tailwind. Eastbound transatlantic flights ride the jet stream north; westbound flights dodge it by going further south or north of it.
- ETOPS rules require twin-engine planes to stay within a certain flying time of a diversion airport. This can push Pacific routes closer to the Aleutians or Hawaiian Islands.
- Restricted airspace forces routes around certain countries or military zones.
- Weather reroutes flights around thunderstorms, volcanic ash, and severe turbulence areas.
None of these typically move a flight far enough to change the window seat answer. The Grand Canyon doesn't jump from the right side of the plane to the left because of a jet stream correction. But they can affect whether you see a feature at all, if the reroute takes you too far from it.
See the sun's position along your flight path.
Open the Flight Sun Map →Route-specific guides
For detailed left-or-right breakdowns on the most popular corridors:
Coast-to-coast routes across the Rockies and the Grand Canyon corridor.
View guide →Most scenic flights in the world
Over 2,200 routes scored for scenery on both sides of the cabin.
View guide →Left or right side of the plane?
The four factors that decide every route, with quick-reference tables.
View guide →Frequently asked questions
Why don't planes fly in a straight line?
They do fly the shortest path — it just looks curved on a flat map. The Earth is a sphere, so the shortest distance between two airports follows a great circle, which bows toward the poles on a Mercator projection. A flight from London to Los Angeles heads north over Iceland and Greenland because that route is roughly 500 miles shorter than going due west across the mid-Atlantic.
How does the flight path affect which side of the plane has the best view?
The path determines what geography you fly over and at what angle. A flight from JFK to LAX tracks south of the Grand Canyon on most routings, putting it on the right side. A polar route from Chicago to Tokyo arcs over the Aleutian Islands, visible from the left. Knowing the path tells you which landmarks fall on which side of the cabin.
Do flights from London to Los Angeles fly over Greenland?
Yes. The great circle route from London to Los Angeles passes over southern Iceland and the southern tip of Greenland. On a clear day, passengers on the left side can see Greenland's ice sheet about 3 hours into the flight. The route then crosses Hudson Bay and the Canadian prairies before reaching the US.
Why do transatlantic flights go so far north?
The great circle between Europe and eastern North America curves through the North Atlantic, often passing over or near Iceland, Greenland, and Labrador. This route is the shortest distance on a sphere. Flights also follow the jet stream when traveling eastbound, adding another reason to favor northern tracks.
What is a great circle route?
A great circle is any circle on a sphere whose center coincides with the center of the sphere. It represents the shortest surface distance between two points. Airlines use great circle routes as the basis for flight planning, then adjust for weather, jet streams, restricted airspace, and fuel stops.