Night Train Sofia Istanbul

Hi Roland, great to hear that you're looking into the Sofia - Istanbul night train. Note that it runs all year round. You can check this page from the Bulgarian railway website to view more information about it.

You can view the timetable if you scroll down, it opens as a pdf file. The current one displays timetable information until the 11th of June, but I suspect they'll be updating their website around May to include later dates! Reservations can be made in person at the station.

Also, the dedicated Interrail Page for this night train gives an approximate overview of the reservation fees.