If your checked bag exceeds the 20kg weight limit on a Ryanair flight in 2026, you will be hit with an "Excess Baggage Fee" for every extra kilogram. This fee is typically around £11 to £15 per kilo if paid at the airport. This means that if your bag weighs 23kg, you could be asked to pay an additional £45 on the spot, which is often more than the original cost of the bag itself. Ryanair is notoriously strict with these limits because their business model relies on fast turnaround times and fuel efficiency; every extra kilo adds up across hundreds of flights. If your bag is significantly over, they may even refuse to carry it if it exceeds the "Health and Safety" limit for baggage handlers (usually 32kg). To avoid these high fees, the best strategy is to weigh your bag at home or use a portable luggage scale. If you know you will be over, it is much cheaper to "Pre-purchase" an additional weight allowance on the Ryanair app at least two hours before your flight, which can save you up to 50% compared to paying the "At-the-Gate" penalty.