Yes, you can still change your seat on an EasyJet flight even after you have checked in for your 2026 journey. To do this, you need to log back into the EasyJet website or mobile app and navigate to your booking. Under the "Manage Booking" section, you can select a different seat from the available options. However, unless you have an "Extra Legroom" or "Up Front" seat included in your fare (such as with a FLEXI fare or EasyJet Plus membership), you will likely have to pay a fee for the new seat. This fee varies depending on the route and the desirability of the seat. Once you have made the change and paid any necessary fees, you must re-issue your boarding pass, as your previous one with the old seat number will no longer be valid at the gate. If you try to change seats at the airport, the staff can assist you, but the fees at the counter are generally higher than they are through the app, so it's best to handle any changes digitally before you head to the terminal.