Adding Bags or Upgrading a Seat After You've Already Booked

A checked bag added online with Ryanair a week before departure might cost around 25 euros. The same bag, added at the bag drop desk at the airport, can cost 59 euros or more, and if you try to bring it to the gate as an unpaid oversized item, the gate fee is often the highest tier of all, sometimes over 70 euros. The bag has not changed. Only the moment you decided to pay for it has.

Why the price climbs the closer you get to departure

Budget airlines price ancillary extras like bags, seat selection and priority boarding on a rising scale deliberately, the same way concert tickets get more expensive as a show approaches. It is not a glitch or an oversight; it is the business model. Full-service carriers like British Airways or Lufthansa are somewhat more forgiving, but even they typically charge more for an airport bag purchase than an online one.

How to add extras after booking

1. Go to 'Manage My Booking' on the airline's own website. Use the booking reference and the name exactly as it appears on the ticket.
2. Compare the bag and seat prices shown there. These are almost always cheaper than airport prices, even if they feel expensive in the moment.
3. Add a seat upgrade separately from a cabin upgrade. A seat with extra legroom in economy is usually a small fee; a move to business class is a different, much larger purchase, sometimes requiring a call to the airline instead of the website.
4. Save or screenshot the updated confirmation. Airport staff can look up your booking, but having proof of purchase avoids any confusion at bag drop.

Upgrading a seat later on a full-service ticket

On full-service airlines, upgrading from economy to premium economy or business after booking is usually possible through the manage-booking portal, through a phone call, or via a bid-based upgrade program like Lufthansa's, where you offer a price and the airline may accept it closer to departure if the cabin has empty seats. Frequent flyer miles can sometimes be used for the same purpose, often at a better value than paying cash outright.

What we can't do from here

EuroHostelTraveler is an independent publication that writes about how airline pricing and policies work. We do not sell tickets, hold reservations, or have any way to add a bag or upgrade a seat on your booking. All of that has to be done through the airline you booked with directly, ideally before you ever reach the airport.

The rule that saves the most money here is almost boringly simple: whatever extra you think you might need, add it online the moment you suspect you'll need it, because the price only ever goes up from there, right up until the very expensive version of it waiting for you at the gate.