If your checked bag exceeds the standard weight limit on United Airlines in 2026, you will be charged an overweight baggage fee in addition to the standard checked bag fee. For Economy passengers, the weight limit is 50 lbs (23 kg). If your bag weighs between 51 and 70 lbs, the fee is typically $100 to $200 per bag, depending on your destination. If the bag is between 71 and 100 lbs, the fee can jump to $400 or more for international routes. Note that United generally refuses to carry any bag over 100 lbs (45 kg) for safety reasons. For those in United Business, United First, or with Premier Gold status and higher, the weight limit is increased to 70 lbs (32 kg) at no extra charge. A high-value "pro-tip" for 2026 is to weigh your bag at home; if you are over 50 lbs, it is often significantly cheaper to pack a second "overflow" bag and pay a second bag fee (around $45–$100) than to pay the heavy overweight penalty for a single large suitcase.