Chart of Glasgow Airport busiest routes to and from Glasgow (2016)

Passenger traffic at Glasgow Airport reached a record high in 2016 when nearly 9.4 million passengers passed through the airport.

Reference 1: Total passengers and Change 2015/16.

Reference 2: London–Heathrow, London–Stansted, London–Gatwick, Dublin, Amsterdam, Dubai–International, Bristol, Belfast–International, Tenerife–South, London–City, Alicante, Birmingham, Palma de Mallorca, London–Luton, Málaga, Southampton, Belfast–City, Berlin–Schonefeld, Paris–Charles de Gaulle and Lanzarote.

Source: http://en.wikipedia.org/wiki/Glasgow_International_Airport