A DUI charge is expensive, particularly when you total all the combined costs. This includes legal fees, court costs, fines, and an increase in insurance premiums. Insurance premiums will tend to go up significantly after a DUI conviction because the driver is now considered to be high-risk. The average cost of a DUI in Florida is around $3,500, just in the cost of fines. A DUI is a serious offense that carries heavy penalties as a result.