External determinants cover political factors, the economic situation, the news and travel media, and the marketing activities of tourism organisations. Determinants mean that many vacations are the result of a compromise between the motivations of the tourists and their personal determinants.

External determinants of tourist behavior are the outside forces and environmental factors that influence a person's decision to travel and their choices during a trip. These are distinct from "internal" factors like personal personality or motivation. Key external determinants include economic factors, such as the exchange rate between the home and destination currency, the current global inflation rate, and the availability of disposable income. Social and cultural influences—including travel trends seen on social media, family expectations, and cultural norms—also play a massive role. Political and legal factors are critical as well; these include visa requirements, government travel advisories, and the relative safety or stability of a region. In 2026, technological influences have become a dominant external determinant, with AI-driven personalized marketing and real-time review platforms like TripAdvisor significantly swaying where people choose to go and what they do. Lastly, marketing and media portrayals of a destination can create "perceived value," driving demand even when physical or economic constraints might otherwise suggest a different choice.