This paper estimates the expenditures of Swiss travellers by means of a hedonic regression. Based on the constituting elements of a trip (number of travel companions from the same household, duration of trip, choice of destination, means of transport and accommodation), the overall and marginal costs of a trip (and thus expenditures) are estimated by log-linear regression. The key determinants of travel expenditure are (1) with regard to domestic tourism the number of participating household members, and (2) with regard to international tourism the duration of a trip. With regard to all forms of tourism, the type of accommodation has the comparably highest effect on trip expenditures.