Due to COVID-19 Kereta Api Indonesia has made new rules for boarding a train, amongst others the need to show a negative corona test. Check the KAI website before booking.
Looking for a train ticket to Kebumen? Find here easily all available train tickets and other relevant information. You can search for cheap train tickets to Kebumen and easily compare ticket prices for different dates and stations.
These are the stations near Kebumen for which you can book a train ticket online. There may be more stations near Kebumen but they are only for local trains.