Yes, you can pay for hold luggage at the airport, but in 2026, it is significantly more expensive than paying online. Airlines like Ryanair, EasyJet, and even legacy carriers now implement "Airport Gate Fees" or "Counter Fees" that can be double or triple the pre-booked price. For example, a bag that costs $30 to add during online check-in might cost $70 to $100 at the airport counter. Additionally, some "Basic Economy" fares on modern airlines only allow baggage to be added via the mobile app, and staff at the airport may direct you to use your phone even while standing at the desk. To avoid these "convenience penalties," it is always best to weigh your bag at home and purchase the required allowance at least 24 hours before departure. If you find your bag is overweight at the check-in desk, many airports now have "re-packing stations" where you can shift weight to your carry-on to avoid excess weight fees.