Spirit Airlines Checked Bag Fees keeps ticket prices low by charging separately for extras like luggage. The fees for checked bags vary depending on when you pay. Purchasing your baggage allowance during booking usually saves money compared to paying at the airport or gate. Typically, the first checked bag costs between $35 and$45 if booked early. Last-minute purchases can double that price. Knowing the baggage fees ahead of time helps travelers budget properly and avoid surprises at check-in.