Eight domestic carriers - Air India, IndiGo, SpiceJet, GoAir, Air India Express, Vistara, AirAsia and Alliance together have 595 planes in their fleet at the moment.
Spicejet in a release said it has added some 23 planes in the last one month alone.
"Who could have thought that from the brink of closure in December 2014, SpiceJet would have a 100-aircraft fleet in 2019," SpiceJet chairman and managing director Ajay Singh said on the induction of 100th plane in the fleet.
The Gurugram-based budget carrier now has 68 Boeing 737s, 30 Bombardier Q-400s and two B737 freighters.
The airline at present operates 575 daily flights on an average to 62 destinations 53 domestic and nine international, it said.
SpiceJet is a key player in the Union government's regional connectivity scheme UDAN operating 42 flights per day to and from various regional destinations, it added.