Thailand has many strengths being one of the most attractive travel destination in the world. A rapid growth of Thailand’s tourism has provided considerable prosperity to the country. It is 7.6% of GDP in 2011 and rising. This research used monthly data of international tourist arrivals to Thailand during 1995 to 2011 provided by Tourism Authority of Thailand as dependent variable. Lag effect, macroeconomic factors, dummy variables for seasonal effects and disruptions were used as independent variables. The purpose is to estimate tourist arrivals by month and by source because it will give a more accurate and usable estimate. The estimated models can be used to test for the effects of disruptions by quantifying the effect of tourist arrivals and the economic impact.
The findings suggest that care should be taken when launching short-term promotions and trend monitoring is very important because tourists from different sources respond differently against changes in factors affecting their demands for travel. Understanding the determinants of international tourist arrivals by source provides valuable information to the Thai tourism industry on how, when and where to target promotion programs.

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