The object of this study is find model forecasting that suitable for data the number of international tourist arrivals to Thailand between 2008 – 2014. Method that use forecasting is Winter Exponential Smoothing method and Box-Jenkins method. The result from study method that most suitable with data is Winter Exponential Smoothing (LA) because have MAPE (%) 5.92 % which lower when compare Box-Jenkins method. From future forecasting by Winter Exponential Smoothing method in December every year is month that number of international tourist arrivals to Thailand most which similar above data. Conclusion when future forecasting data still have seasonal like above data.