By plane
If you're not coming to Sibiu from another Romanian town, plane is an excellent option, as there are direct connections to Sibiu International Airport from many European cities, especially those in Germany and Italy.
Carpatair , Transylvania's largest airline, offers daily connections to Munich, Bergamo and Treviso, and connections three times a week to Bologna, Verona, Rome and Stuttgart.
TAROM , Romania's national carrier, as well as LUFTHANSA flies five times a week from Sibiu to Munich and also five times a week to Vienna. For those with money to splurge, there are also flights three times a week to Bucharest, even though you're better off taking the train if you're coming from inside Romania. There are frequent specials, though, so look at the TAROM website before deciding one way or the other.
Blue Air , direct low cost flights to Cologne, Stuttgart and Madrid.
By train
Despite Sibiu's location in the centre of the Romania, it is quite a lot harder to get here than to other cities like Brasov and Cluj-Napoca, mainly due to Sibiu's location outside the main railway line which joins Bucharest to Hungary and beyond. However, train remains the easiest, cheapest and most comfortable way to get here. Remember, though, that from Bucharest, there are just two trains daily to Sibiu one in the morning, one in the night. Also, Sibiu is one of the only cities of Romania not served by the modern and snazzy InterCity network from Bucharest, even though there are InterCity trains from Cluj Napoca.
From Bucharest, the train most tourists take is the day train A 1621 which leaves Bucharest North at 10:30AM and arrives at Sibiu at 17:31, nearly 7 hours later and stopping at most towns along the way. The train is pretty uncomfortable and crowded- hopefully, however, CFR Romanian Railways will soon introduce InterCity trains on this route.
Coming from Cluj Napoca, the main city of Transylvania, is a much better opportunity to get to Sibiu. In fact, many tourists do just that, as part of their Transylvanian tour. From Cluj Napoca, there are two fairly-convenient trains a day, one at 5:41AM and one at 2:57PM, taking around 3.5 h. The trains are smooth-running and very comfortable.
The train schedule changes every summer and winter so it is better to check it online. (http://www.infofer.ro)
By bus
Sibiu is well connected to Bucharest and Cluj Napoca. From Cluj Napoca there are buses almost every hour, provided by Dacos, Fany and Transmixt, taking around 3.5 h. The buses are smooth-running, very comfortable and cheap.