A study of the determinants of the demand for foreign travel, based on a model capable of analyzing the consumer's choice of journey destination. The model includes several constructs that have been ignored by most travel demand economists--namely, the inclusion of a time constraint; the modification of the budget constraint to include the transportation costs between alternative destinations; and the modification of the time constraint to include the time costs incurred when traveling between alternative destinations. The model is tested empirically by estimating demand equations suggested by the constraint variables and destinational characteristics defined in the model. The tests provide estimates of the demand function for international air travel and permit an investigation of the importance of several variables that have thus far been ignored by travel demand economists. 22 pp. Ref.