While the Chennai-based carrier added as many as 29 aircraft in the past 26 months, its operations increased by 111 per cent during this period.
"We have got the delivery of the last three Q400 NextGen turboprop aircraft from Bombardier. This takes the total size of the fleet to 51 and completes the order for 15 Q400s," SpiceJet said in a statement.
These aircraft have been ordered to connect tier-II and tier-III markets and apart from some short-haul destinations.
During the period between October 2010 and December 2012, SpiceJet added 29 aircraft - 14 Boeings and 15 Bombardiers. During this period, its daily flights grew 111 percent, the airline said.
The 78-seater Q400 NextGen turboprop aircraft is widely accepted as the best short-haul plane in the world.
SpiceJet has options to get 15 more Q400s.
These aircraft purchases were financed by the EDC (Export Credit of Canada) facility agreed in June 2011.
"SpiceJet has grown aggressively in the last 26 months adding 29 aircraft" company chief executive Neil Mills said.
SpiceJet, with 19.5 percent market share as of November, currently operates over 330 daily flights to 39 domestic cities and five international routes.