These aircraft belong to different categories, including A320neo, A321neo, and A321XLR.
The agreement includes 620 new installed engines and associated spare engines, as well as a long-term, multi-year service agreement.
In 2019, IndiGo had selected LEAP-1A engines and signed a long-term service agreement for engines to power 280 A320neo family aircraft.
Consequently, the new agreement secures the LEAP-1A engine and its long-term service agreements for a total of 590 IndiGo A320neo family aircraft.
Currently, the airline is operating seven A320neo and 15 A321neo aircraft with LEAP-1A engines.
"This is a pivotal milestone that reflects our long-standing commitment to rapidly strengthen our network, both domestically and internationally," said Ronojoy Dutta, Chief Executive Officer of IndiGo.