Singapore Airlines (SIA) flew more people in June compared to the same month last year but not enough to fill up extra seats that had been added.
Total passenger traffic grew 2.7 per cent to 1.58 million, falling short of capacity which increased by 4.4 per cent, the carrier said on Monday.
Regional arm SilkAir carried a total of 313,000 passengers, a 7.6-per-cent jump from June last year.
The airline's freight business continued to suffer in line with weak global demand.
Total amount of cargo carried slid 6.3 per cent year-on-year.
Despite business challenges, SIA has continued to invest in new products and services to grow market share and boost its bottom line.
Last week, the airline unveiled new seats and other cabin fittings that travellers will experience from September.