Cloud federation has emerged as a new paradigm in which different service providers collaborate to overcome limitation of cloud resource during sudden spikes in demand and improve quality of service (QoS) for delivered cloud services. The growing number of cloud federation to provide cloud services has made service selection a complex task due to varied nature of parameters like price, QoS and trust of different federations. In this context, formal decision making methodology is required to find the best federation which can deliver a services with high QoS and trust in a cost effective way. The proposed model conducts a multi-criteria decision analysis to select best cloud federation in specific time period in accordance with user preference over each parameter. The experimental result and analysis validate the effectiveness of our proposed model.