International and domestic routes were up 16.5% and 2% respectively thanks to additional capacity from a number of airlines including Thomson and Thomas Cook.
There was strong demand for the airport’s growing list of European city destinations including Eurowings’ Dusseldorf route and Ryanair services to Brussels, Sofia and Valencia.
Ryanair’s recently launched Lisbon route performed particularly well as hundreds of Celtic fans made their way to the Portuguese capital to celebrate the 50th anniversary of the club’s historic 1967 European Cup win.
May also saw the airport’s long-haul services up by 15% thanks to an increase in demand for North American flights including Florida and Emirates’ double daily service to Dubai, while easyJet’s Bristol services and Loganair’s Highland and Island routes helped boost domestic travel.
Amanda McMillan, managing director of Glasgow Airport, said: “May was an extremely successful month which saw the launch of Delta Air Line’s inaugural New York-JFK route and new service to Bergen and the Isle of Man.
“Strengthening our EU connectivity continues to be an area of focus, so Lufthansa’s recent decision to expand its current seasonal weekly service to four flights per week all year round was extremely welcome news.
“In addition to making it easier for tourists from one of our biggest international markets to visit Glasgow, the expansion of this route will play an important role in strengthening Scotland’s connectivity by providing passengers with access to major markets worldwide through Lufthansa’s Munich hub.
“As we look ahead this month the airport is gearing up for what is set to be our busiest June on record as the school term comes to an end and tens of thousands of families pass through our doors to head off on their holidays.”