The Norwegian group carried more than 2.7m passengers last month, up 10% year on year.
Norwegian Air had almost 2.4 million passengers while regional carrier Widerøe had 340,955 passengers.
Norwegian’s load factor was up by 0.4 percentage points to 85.7%, in a month that had a capacity increase of 11% compared to August last year.
Geir Karlsen, chief executive of Norwegian, said: “I am pleased that we continued the positive trend from July to August. We had a significant increase in capacity year on year, while at the same time improving both the load factor and the yields from August 2023.”
Norwegian also reported “good booking momentum” into the autumn and winter seasons.
Karlsen said: “The launch of several new and exciting routes, in addition to an already extensive network, suggests a busy autumn season lies ahead for Norwegian.
“Norwegian’s autumn sales campaign was well received by our customers. We are excited to see the pace of bookings continuing into the autumn and winter seasons across a good mix of traditionally popular routes and new destinations.
“The autumn school holiday weeks are beginning to look quite busy with many popular destinations filling up rather quickly.”