By train
Rovaniemi is the terminus of most trains from the south. The line extends only a little further northeast to Kemijärvi. The journey from Helsinki takes 9–12 hours and is reasonably comfortable in a sleeper. You can also take your car with you. The railway station is located right next to the city centre and is within an easy walking distance - you facing north when you exit the station, and the city center is to your right, to the northeast. Most of the long-distance buses stop here as well.
By plane
Rovaniemi Airport (http://www.finavia.fi/air...) RVN or EFRO, located eight kilometers north from the city center, is the largest airport in northern Finland. Most of the flights go south to Helsinki, but it fields a limited number of international flights mostly to North Russian destinations like Murmansk. To get to the city center you have to take a bus or a taxi. Flights from Helsinki, operated by Finnair or Blue1 or Norwegian, may be cheaper than corresponding train.
By bus
Gold Line (http://www.goldline.fi/) and Oy Matkahuolto Ab (http://www.matkahuolto.fi/en/) operate daily night buses to Rovaniemi from Helsinki via Helsinki-Vantaa Airport. Coming by bus from the south is relatively cheap but requires about 14 hours of sitting.
The bus station is in the city center and is just a few hundred meters away from the railway station.