A taxi from the airport to bus and railway station will take approx. 20-30 min. and costs 20 lv. (10 Euro).
There are buses and trains from Sofia to Plovdiv every hour or half an hour.
By bus it takes about 2 hours and the ticket costs 12-14 lv. (6-7 Euro). This is the timetable (Go to Domestic Departures – Select station Plovdiv NOT Plovdiv Sever/Yug): https://www.centralnaavtogara.bg/index.php
By train it takes 2.5 – 3.00 hours, second class costs approx. 10 lv. (5 Euro) and first class is 12 lv. (6 Euro): https://www.bdz.bg/en
Plovdiv offers a variety of options for accommodation, ranging from 5-star hotels to modest hostels and Airbnb apartments. The municipality of Plovdiv has made arrangements with selected hotels which will offer a discount to conference participants.