The standard weight limit for spirit airlines baggage weight is forty pounds (18.1 kg). Additional fees, which vary according on the weight of the luggage and can range from $79 to $150, apply if this limit is exceeded. luggage measuring 41–50 pounds are subject to overweight fees; luggage weighing 100 pounds or more are subject to significantly higher fees. We do not take bags weighing more than 100 pounds. To avoid heavy fines, travelers should pack carefully and divide their belongings among several bags if needed.