UFC pays for flights and accommodation for 2 people. I think it's *probably* 2 rooms in a hotel in Abu Dhabi (super nice hotel).
So if he is taking 3 people (cornering him & working with him etc) then I guess he needs flights for 2 of them, that are not covered by UFC. Las Vegas to Abu Dhabi flights can be had for around 600 or 700USD (not sure if single or return).
Considering he had a main-event fight just 3months ago in June for UAE Warriors that he WON (and that was, oddly, in Abu Dhabi... so i'd imagine he took his coaches for that one and could afford to do it)
....it's a bit surprising.
EDIT: OK so he is fighting for UAE WArriors, not UFC. Am sure he will be well paid by them, he just got paid in June!