Norwegian saw passenger numbers rise by 12% in August to almost 2.9 million.
Europe’s third largest low cost carrier achieved a 96% load factor on long haul routes.
The increase in carryings came as the airline increased year-on-year capacity by 17%.
Chief executive Bjørn Kjos said: “The August traffic figures show that our positive development continues with more passengers and high load factor in all markets.
“We’re particularly satisfied with the development of our intercontinental operation, appealing to an increasing number of passengers on both sides of the Atlantic.”
Norwegian operated 99.6% of scheduled flights in August, with 77.6% departing on time.