The investment is the final phase of the £1.3bn Manchester Airport Transformation Programme (MAN-TP), first announced in 2015 with a 10-year plan to "revolutionise the customer experience" at the Northern hub.
The latest instalment will fund new facilities, technology and equipment, as well as a new range of shops, bars, restaurants and airport lounges.
The first phase saw Terminal 2 more than double in size, with the new facility, the airport said, having received positive feedback from passengers and airlines since opening in July 2021.