Check that Travel Agency's reviews online. Is flight included in the package?
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Then 25k for hotel, sightseeing, transfer and only breakfast sounds good. make sure to check the itinerary and the hidden costs if any
The flight fare isn't included.
Is the flight tickets are excluding ?? and for how many days?
25k including flight is a reasonable fare to Thailand but it also depends what are the place they would take you. To and fro flights might cost you within 15k. You can cover Bangkok and Phuket or Krabi or Pattaya.
Firstly you need to analyze about the travel agency rather than focussing upon the package cost.