Jet2 and Jet2holidays have seen bookings exceed a 25% hike in summer capacity.
Meanwhile, winter bookings were described as being “satisfactory”.
The trading update came from parent company Dart Group at its annual meeting.
Executive chairman Philip Meeson said: “The positive start to the financial year as reported in our preliminary results statement of 12 July 2018 has continued, with leisure travel bookings growing slightly ahead of our 25% summer 2018 seat capacity increase and winter bookings satisfactory at this stage.”
He added: “Demand for both our flight-only offering and our higher margin package holiday product remains strong and package holiday customer numbers as a proportion of total departing customers have increased slightly for summer 2018.
“Overall the board expects the group to meet the recently upgraded market expectations of profit before foreign exchange revaluations and taxation for the year ending 31 March 2019.
A further trading update will be issued on publication of the company’s interim results on November 15.”