On February 18, 1918, he emigrated to the French Republic (Paris), and in March, 1919 he moved to the United States. Until 1923, he had no his own income, sometimes he gave pilot lessons and lectured in secondary schools. But it was changed in 1923, when he founded an aviation company, later Sikorsky became the owner of the design and construction company "Sikorsky Aircraft". By 1939 he had built about 15 types of aircraft.