Virgin Australia's domestic passenger traffic, as measured in RPKs, decreased by 4.4% year on year in May.
The carrier's overall passenger numbers fell by 4.2% year on year to 1.55 million.
Domestic passenger numbers fell by 5.1% to 1.35 million and international passenger numbers rose by 2.9% to 198,000 in May, the carrier says.
The airline's overall capacity, as measured in ASKs, increased by 4.4% during the period. Its domestic capacity went up by 5%, while international capacity grew by 3.3%.
Virgin Australia's overall passenger load factor dropped by 5.1 percentage points to 71%. Its domestic passenger load factor fell by 6.8 percentage points to 69.3% and international passenger load factor decreased by 2.2 percentage points to 73.8%.