Dublin is one of a small number of airports with direct flights to all six London airports (Heathrow, Gatwick, Stansted, Luton, City and Southend). The Dublin-London air route is the busiest in Europe and the second busiest international route in the world, with over 100 flights a day across Aer Lingus, British Airways and Ryanair.
The only domestic routes available from Dublin are with Aer Lingus to Donegal and Kerry.