Liverpool John Lennon airport overcame strike action by a group of workers to see passenger numbers edge up by 3% in August.
The year-on-year growth saw more than 535,000 passengers use the airport last month – the highest monthly figure in seven years.
The summer peak month performance contributed to a 2.5% increase in business for the year to date.
Almost 3.5 million passengers have used the airport this year – more than 86,000 than in 2017.
Eighty airport staff represented by the GMB union took strike action over pay over August bank holiday and is threatening a series of further strikes
But new services helped boost passenger levels, including flights to Palma and Malaga by Blue Air; to Pula, Dalaman and Palermo by easyJet; Shannon by Ryanair and Wideroe to Bergen.
Higher passenger loads were also seen on existing well established routes.
Queue times for passengers to go through airport security remained low throughout August with 98% of passengers taking ten minutes or less.
Growth is expected to continue in the coming months with a number of new routes, including Wizz Air flights to Cluj, Iasi and Bucharest; Ryanair to Paphos and easyJet to Toulouse.