Understanding the Frontier Airlines Baggage Policy is crucial to avoid unexpected fees at the airport. Although Frontier is renowned for offering inexpensive base rates, the majority of baggage is extra. One complimentary personal item that fits under the seat is permitted per Frontier Airlines' baggage policy. Additional fees apply for both checked and carry-on baggage, and they differ depending on when and how you buy them. The prices under Frontier Airlines' baggage policy are lower the earlier you pay for your bags, such as when you book online. There are size restrictions and a 40-pound weight limit for checked luggage. Oversized or overweight bags will incur additional fees. Light packing is encouraged by Frontier Airlines' luggage policy in order to reduce expenses.