Cathay Pacific raised capacity between Hong Kong and London last month to cope with demand for student travel.
The carrier reported that travel sentiment remained strong in September.
Passenger numbers rose by 480% year-on-year to 1.5 million in the months with the load factor up by 11.2 percentage points to 83.7%.
Chief customer and commercial officer Lavinia Lau said: “As we exited the busy peak summer months for passenger travel, we saw increased student traffic in September ahead of the start of the new school year, in particular to the UK.
“To cater for the strong demand, we increased the frequency of our flights between Hong Kong and the UK in September, with our services from Hong Kong achieving load factors of 98%.
“In addition to student traffic, there was a notable increase in outbound passenger travel from Hong Kong during the last week of September coinciding with the id-Autumn Festival and National Day holidays.
“We also saw strong demand from the Greater Bay Area and the rest of the Chinese mainland for travel both into Hong Kong and to destinations beyond around the holiday period.”
She added: “Looking ahead at the coming months, on the travel side we will continue to increase capacity as much as is feasible to provide more choice and flexibility for our customers.
“Earlier this month, we resumed our Chicago passenger service, which received a very encouraging response from our customers.
With the next holiday period not until Christmas, we will remain agile to capture demand, including connecting traffic via the Hong Kong hub.”