Abstract
This paper focuses on online travel agencies (OTAs) as a quantitative data source for tourism marketing. Most research on OTA data has focused on hotel ratings and hotel reviews, and there was insufficient discussion regarding the use of real-time updated data, such as provided plan information. Therefore, we conducted research to characterize such data. First, we constructed a database that continuously collects and accumulates data from OTAs. We verified the reliability of the data by estimating numbers of guests using the data. The results indicate that the reliability of the data depends on the scale of the analyzed city.