You can get to Sumy from Kharkiv by mini-bus (buses are departing every hour or two during the day time), by bus or by train from Kharkiv Train Station.

Schedule of mini-buses from Kharkiv to Sumy:

To reserve a seat in the mini-bus, please call one of the phone numbers in advance. A one-way ticket costs 200 UAH ($8 USD). Travel time from Kharkiv to Sumy is 3 hours.

Location of the bus station at Kharkiv Railway Station is the parking lot in front of the train terminal.