Many factors determine how long a flight will be. Distance between the origin and destination is most important. But other things such as flight path, airline, aircraft type, and headwinds or tailwinds also play a role in influencing flight duration.
On this site, we list average flight times between airport pairs for direct, nonstop flights. Itineraries without any connections or stopovers. Please note that the first times listed in the posts are the air time, the amount of time between takeoff and landing. For purposes of planning a multi-segment trip, or for just knowing how long it will be until one gets off the plane, a longer time, the gate to gate time is needed. Approximate gate to gate times are listed later in the posts.
There are a number of ways to efficiently use this travel website. On the left hand side of the page is a menu of links to our category pages, which are based on state and country the airport is in. So if you are interesting in how long the flight is from San Francisco to Tokyo, you might click on the CA link to see California airports. And then select the right post. Another way to find the duration of the flight is to use the search box on each page. E.g. by typing in the city pair your flying between, or the two airport codes.