The estimation of tourism demand is fundamental to the conduct of impactful, efficient, and sustainable investment in the destination site. Tourism in Mexico represents approximately 7% of total GDP, while for the state of Yucatan, it represents close to 2% of its state GDP. This activity positively impacts the economic flow and employment of the population. The study analyzes from a microeconomic approach the demand of air travelers arriving in Merida, Yucatan. With a quantitative approach, non-experimental design, and a sample of 784 people, the factors that determine the length of stay in the city of Merida were determined through a Poisson model with the estimations the use from the Generalized Linear Model. The statistically significant results indicate that age and the pure tourist motive have a positive effect in the length of stay, while education and the perception of airport infrastructure have a negative effect. The average length of stay in Yucatan is 4 nights.