What factors determine the actual EMI amount that the borrower will incur?

Aside from the three variables required by the travel loan EMI calculator, the other factors that can determine the EMI are:

Your credit history: Before your travel loan application is approved, the lender takes a look at your past credit history, and specifically, your credit score. If the credit score is good, you will incur a lower rate of interest and thus, lower EMIs. 

Your current occupation: If you are a salaried employee earning a regular income from a well-established company, not only does your travel loan application get easily approved but you incur a lower interest rate as well. 

Your residence: The rate of interest might be lower if you are residing in the house you own as compared to residing in a rented house.