List of busiest passenger flight routes

These are lists of the busiest flight routes by the number of passengers flown, by seat capacity and by aircraft movements.

Note that these statistics do not consider the number of passengers actually carried (load factor).

[16] Busiest flight routes inside the EU, UK, Switzerland, Iceland and Norway.

[a][b][c] For routes from the EU, UK, Switzerland, Iceland and Norway to other countries inside Europe except to Turkey, the busiest was in 2019 Paris/CDG – Moscow/Sheremetyevo with 830,980.

Busiest flight routes by city pairs within the United States:[35] The statistics below are based on metro areas, not individual airports.