National Express is set to add over 16,000 seats per week to its intercity and airport routes from 4 December.
The company says the expansion comes in response to service reductions by a competing operator.
The additional seats will be available on frequented routes connecting London, Birmingham, Bristol, Cardiff, Leeds, Leicester, Newcastle, Newport, Nottingham and Manchester.
Says Ed Rickard, Network Director at National Express: “We recognise the growing need for reliable, affordable and convenient public transport options. By increasing capacity and frequency on our key intercity and airport routes, we’re making it even easier for people to get to where they need to be.
“We’re expecting to see strong demand and have the flexibility to add more capacity when needed, especially as people start to make travel plans for the festive season.”
The investment follows a rise of 25% in customer numbers in 2023.