To check your seat on the Eurostar in 2026, the most direct method is using the Eurostar mobile app or the "Manage Your Booking" section on the official website. Once you log in with your six-character booking reference (PNR) and your surname, your digital ticket will display your Carriage (Coach) number and Seat number. If you haven't boarded yet, you can also use this portal to change your seat for free, provided there is availability in your class of service. A high-value tip for 2026: Eurostar has integrated more "seat map" functionality, allowing you to see if you are in a "solo" seat, a "club-four" table, or near the luggage racks. If you are already at the station, your seat information is also printed on your physical boarding pass and displayed on the screens above the platforms. For those using a Eurail or Interrail pass, your seat must be reserved separately, and that specific reservation document will contain your confirmed seat assignment for the cross-channel journey.