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.

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

Figures are only available for EU countries, Switzerland, Iceland and Norway.

[b][c][d] 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:[36] The statistics below are based on metro areas, not individual airports.