In 2019, the busiest domestic route at Adolfo Suárez, Madrid–Barajas International Airport, an international airport serving Madrid in Spain, is Catalonia Barcelona (served with three carriers), while the least busy domestic route is AsturiasOviedo,  (served with two carriers).
In 2019, the busiest domestic route at Adolfo Suárez, Madrid–Barajas International Airport, an international airport serving Madrid in Spain, is Catalonia Barcelona (served with three carriers), while the least busy domestic route is AsturiasOviedo,  (served with two carriers).