Varna is the main city on the Bulgarian Black Sea Coast. Information about flights to Varna is available on the web page of Varna Airport. You can also fly to Bourgas Airport which is at about two hours drive from Varna. The buses from Bourgas to Varna are at approximately every one hour; the last for the day being at 18:00. There are shuttle buses as well which depart when full. From Sofia one can get to Varna by train or bus. The trains cover the distance for 7 to 8 hours; the cost is 10 - 15 EUR. The buses are a bit faster, more expensive and at every half hour. Check the Bulgarian Railroads and Sofia Central Bus Station sites for details and timetable.