There are a variety of situations in which paying off a loan in full before its term ends could be a sound decision.
For example, if you have some savings and using this money will not affect your ability to meet your other financial obligations, clearing your debt will mean that you have one less monthly payment to worry about.
Consolidating your debts with a loan that offers a lower interest rate is another excellent reason to repay your current lender in full, as this has the potential to save you a lot of money in accrued interest costs over the course of your loan term.