Every object has its own natural frequency when the frequency of a source is equal to the objects natural frequency the object will be tends to vibrate this may result in flutter for an aircraft during its cruise speed.Flutter, an unstable oscillatory aerodynamic condition with high frequency and large amplitude ensuing from fluid structure interaction is of precise interest for many aero elastic researchers. This demon results in a catastrophic failure of structure rapidly. Therefore, there is an immense requirement of predicting the flutter speed accurately considering the various uncertain conditions obviously. The general theory of aero elastic instability and the crux of elementary mechanism of flutter have been explained profoundly by many earlier researchers. Flutter problem has been of great interest since early years of flight these will lead to aerodynamic instability and life reduction of an aircraft wing and its components.So while designing an aircraft these flutter has to be consider. We had analyzed a subsonic passenger aircraft in its cruise speed using optimization tools CFD and FEA tools. In our paper we would like to exposure the results computationally including both fluid and structural interaction problem. By this way we can able to predict accurately the nature of an aircraft during its flutter. The structural deformation and stress distribution will be calculated at various conditions
