Fees apply to each piece of checked baggage on Sun Country Airlines. According to their baggage limits, checked baggage is limited to 50 pounds and 62 linear inches in weight. Your first and second checked bags will cost you separately if you select the bag option when booking your reservation or checking in online; if you decide to check a bag at the airport, there will be a fee. Whether you pay in advance or at the airport, a third checked bag will cost.