Hot Climate and Travel After Tummy Tuck?

Fluctuations in weight after an abdominoplasty would not be unusual.  Travel could certainly cause these variations and I would not be too concerned about it.  

Whenever you go to a warm or tropical climate, you are more likely to retain water, particularly if you consume alcoholic beverages or salt-laden food.  Try to cut back on the salt and liquor and remember that a long flight will also cause fluid retention.  I would not consider this to be related to your abdominoplasty without additional information.