SIA has "a temporary surplus of pilots and are managing it through this scheme, which is entirely voluntary", he said.
SIA has more than 2400 pilots - mostly captains and first officers.
The global financial crisis had led to excess capacity and slower growth than anticipated, Ionides said.
"This voluntary scheme will enable us to address the short-term surplus, while at the same time provide staff with the opportunity to take leave for personal reasons should they wish to do so," Ionides said.
SIA saw its net profit in the first-half of the fiscal year ending March fall by 30 per cent year-on-year, weighed down by high fuel prices and weak demand in the travel and cargo markets.
This followed a 69 per cent plunge in net profit in the carrier's financial year ended March 2012.
- AAP