Oversized/Overweight Bags Luggage weighing between 41 and 50 pounds will be charged $75 per bag, per flight, whereas bags ranging 51 to 100 pounds will set you back $100 per bag, per flight.

Frontier Airlines is known for its strict 2026 baggage policies, where the standard weight limit for a checked bag is only 40 pounds (18.1 kg), rather than the industry-standard 50 pounds. If your bag exceeds this limit, you will be hit with significant fees. Bags weighing between 41 and 50 pounds typically incur a $75 surcharge, while bags between 51 and 99 pounds are charged $100 per direction. Any bag over 100 pounds will not be accepted at all. These fees are added on top of the base checked bag price you already paid. To avoid these "vacation-killing" costs, it is a high-priority recommendation to weigh your bag at home or use the scales near the check-in counters. If you are just a few pounds over, consider moving heavy items like shoes or electronics into your personal item (backpack), as Frontier does not typically weigh personal items as long as they fit in the sizer.