It comes as the carrier predicts demand for winter sun bookings to increase following a positive start to the year, with north African destinations proving particularly popular.
Additional routes include a new flight to Boa Vista from Birmingham, weekly flights to Sid from Glasgow, Birmingham and East Midlands and a new weekly flight to Sharm El Sheikh from Manchester, Gatwick and Newcastle.
Following the addition of Marsa Alam as a new winter destination with two weekly flights from Gatwick, the company has added 80,000 more seats to the town for the winter season.
Elsewhere, there will be a weekly Monday flight to Sharm El Sheikh from Manchester and Gatwick plus a weekly Wednesday flight from Newcastle.
Hurghada, meanwhile, will gain an additional Gatwick and Manchester Saturday flight from Easter 2024.
Tui will also add a third weekly flight to Boa Vista from Birmingham, as well as weekly UK departures to Sal from Newcastle, Glasgow and East Midlands.
Tunisia will gain an additional 15,000 seats with new flights to Enfidha from Bristol, Gatwick, Manchester and Birmingham, starting from Easter 2024, and Morocco will have additional flights from Easter 2024 to Agadir from Birmingham, and to Marrakesh from Birmingham and Bristol.
Andrew Flintham, managing director for Tui UK, said: "Our North Africa destinations have gone from strength to strength with UK customers and remain a very important part of our vast holiday programme.
"I am really pleased we can offer customers further choice with 150,000 more seats for winter 2023 to amazing destinations."
