Up To 20 Daily Flights: United Airlines’ 10 Most-Served European Airports

United Airlines has more flights between the US nd Europe than any other operator, with London Heathrow being its most served destination. The carrier’s European dominance has been assisted by the launch of flights to four more cities. In May, it started flying to Bilbao, Faro, and Palermo, followed by Funchal in early June. This became the Star Alliance member’s fifth destination in Portugal, a first for any North American operator.