Norwegian carried more than 2.3 million passengers in June 2014, an increase of 21 per cent compared to the same month last year.
The load factor at the low-cost airline was 82.5 per cent. up 2.9 percentage points.
The total passenger traffic increased by 45 per cent, while the capacity increased by 39 per cent this month.
“I’m pleased that we keep increasing the load factors even with major capacity growth.
“This proves that our offer of quality flights at affordable fares is welcomed by the customers.
“We continue to attract new customers in markets outside Scandinavia, in line with our international strategy,” said Norwegian chief executive Bjørn Kjos.
In June, Norwegian took delivery of a brand new Boeing 737-800, as well as a new 787 Dreamliner.
Norwegian will take delivery of 14 Boeing 737-800 aircraft and four 787 Dreamliners during 2014.
Norwegian boasts one of the most modern and environmentally friendly fleets in Europe.
Norwegian operated 99.8 percent of its scheduled flights in June, whereof 83.4 percent departed on time.
The on-time performance was affected by industrial action among air traffic controllers in France.
The carrier launched low-cost flights to the United States earlier this month.