Service encounter has been an important topic in service management. Many researchers argued that customer-to-customer interaction may affect customers' evaluation of service experience. The objective of this research was to explore the tourists' evaluation on customer-to-customer interactions. This research adopted questionnaires to investigate tourists who traveled to foreign areas. In conclusion, the customer-to-customer interaction incidents could be extracted into six factors. There are significant differences in customer-to-customer interactions for traveler with distinct demographic, psychological, sociological, and situational variables.