Flight delay has always been a concern of scholars, but in previous studies, there has been little discussion of passenger behavior choice after flight delay. The paper based on the prospect theory, taking the Beijing-Shanghai route as an example, constructs the passenger behavior choice model under flight delay, and in order to explore the decision-making behavior of passengers with different attributes under different delay scenarios. The results show that the reference point of passengers' behavioral decision-making is dynamic due to different delay scenarios and passengers' attributes. For the same reason, passengers have different behavioral choices when encountering flight delay. Through empirical analysis, it is found that the choice of passengers based on prospect theory is in line with the actual choice of passengers. The choice model proposed in the paper can effectively describe the passenger's choice behavior.