I've never seen a mosquito in the departure/transit area of BKK airport, probably because locals are obsessive about spraying for insects and the land around the airport aren't really mosquito-breeding bounds.

The risk level would be similar to that of flying out of Boston Logan Airport because planes from Florida land in the terminals there.


FWIW, I'm generally not a fan of repellent spray so I usually just use vaseline to cover exposed skin. Safe/stable/cost effective without risking the chemicals.