This article is about establishing a common transition altitude over all territory of Russian Federation. The main objective is to prove the necessity of a common transition altitude in Russian airspace and to define, which variant of transition altitude (low, medium, high) is the most suitable to be implemented in Russia. ICAO and IFALPA points of view, data and experience from different states and regions all over the world were examined in order to show all the advantages and disadvantages of different approaches towards common transition altitude. The research showed that the most appropriate common transition altitude in Russia will be 10000 feet (3050 meters), it will cover almost all the international aerodromes and regions in the country. Only several exceptions are needed in mountainous areas. This article can be used to further study of the possibility of implementation of common transition altitude, because it can’t take into consideration all the local features of all the FIRs (Flight Information Regions) in Russia. The conclusion is establishing a common transition altitude over such a big part of the world as Russian Federation will lead to improvement of the flight safety, harmonization with ICAO and IFALPA policies and flexibility in airspace design.