From the app you can access the Interrail Reservations Self-Service, which is also available on their website. For more information on how to book seat reservations, check out this article.
In the Reservations Self-Service, you can make reservations for almost all trains that require one. Most reservation tickets are e-tickets, but in some cases, you are required to have a paper ticket instead. Both can be ordered via self-service, and the paper ticket will be shipped by mail to your home address. Please keep in mind that the delivery of paper tickets takes extra time, so you need to order these well in advance. If there is not enough time, this will be shown during booking and you will not be able to complete the booking. In this case, you can try to book this train directly at the train station instead (subject to availability). If you are waiting for a long time for your (paper) seat reservation tickets to arrive, check out this article.
These are the trains that can be booked via the self-service tool:
E-tickets:
- Domestic trains in Denmark
- Domestic trains in Hungary
- Domestic trains in Switzerland
- Domestic and international trains in Slovakia
- Domestic and international trains in the Czech Republic
- All domestic Italian day and night trains
- EuroCity Italy -Switzerland trains
- All domestic and international TGV's (France, France-Germany, France-Switzerland, France –Italy, France-Spain)
- InterCity France
- ECB (Germany - Austria - Italy)
- Thalys
- Eurostar
- Railjet trains that are run by ÖBB (only in and between Germany, Austria, Switzerland, and Italy)
- Nightjet trains that are run by ÖBB (only in and between Germany, Belgium, Austria, Switzerland, Italy)
- InterCityEurope/InterCity/EuroCity within and between Germany, Austria, Switzerland, Italy, Netherlands, France
- SJ trains in Sweden
Paper tickets:
- Domestic trains in Norway
- Domestic trains in Finland
- Domestic and international trains in Slovenia
- Domestic and international trains in Croatia
- Domestic and International trains in Poland
- Domestic and international trains in Romania
- International trains in Hungary
- International trains in Scandinavia
- Certain trains run by OBB
Note: There are seasonal night trains from/to Switzerland to the following countries available as paper tickets: Hungary, Slovenia, Croatia, Serbia. Please keep in mind, that they are bookable in Self-service only if the departure or arrival country is Switzerland. It is NOT bookable from Austria or between Eastern European countries.