The wingtip can effectively reduce the induced drag, fuel consumption and exhaust emissions, meanwhile, it is eco-friendly and profitable. However, an economic evaluation is necessary before carrying out the wingtip modification project, due to its cost. Based on the Cost-Benefit Analysis, this paper establishes an economic evaluation model of A-type aircraft modified the wingtip, analyzing the influence of the average flight distance, daily utilization rate of the aircraft, the payment method and the discount rate on the wingtip’s ROI. Finally, some case analysis will be given, combined with the evaluation of feasibility and finance, which provides a reference for airlines to modify the wingtip.