Which flight is longer?
Two boarding passes. Pick the flight that covers more distance, and watch the distances count up.
How to play
Each round shows two airport pairs, such as London to New York and Singapore to Sydney. Tap the one you think is the longer journey. Easy rounds have a big gap between the two. On Hard the difference can be just a few percent, and a daily puzzle has five rounds.
Difficulty and modes
Easy, Medium and Hard each have their own puzzle every day, so there are three to play. A tick on the tab means you have finished it. Unlimited is endless survival play at the difficulty you choose: keep going until you slip, and try to beat your personal best, which is saved in your browser.
What counts as distance?
GeoKnow uses the great-circle distance between two airports, the shortest path over the Earth's surface. Real flights are usually longer because of winds, airspace and weather. See How it works.
More games: Longer Flight, Route Ranking, Code Quiz, Plane Spotter, Population Match, Border Run, Pinpoint, Antipode, Mystery Country, Flag Mixer, Outline, Neighbour Rush, Capital Hunt, Shortcut, Population Showdown, Overflown.