By plane
Flying is the most practical and fastest means of reaching much of Lapland, but for most destinations services are sparse and prices often steep. There are commercial airports in Enontekiö, Ivalo, Kemi/Tornio, Kittilä and Rovaniemi. Best options for airlines are Finnair, Blue1 and Finncomm Airlines. Air Baltic flies to Rovaniemi and Kittilä from Riga.
By train
Trains will get you to the provincial capital Rovaniemi, at the edge of the Arctic Circle or to the northernmost railway station in Kolari.
If entering from Sweden, there is a gap in the network between the Swedish border at Tornio and Kemi, but the connecting bus is free with Inter Rail and Scanrail.
By bus
Long distance buses cover practically all of even the smallest places. They are the cheapest and slowest means of transportation. Although there are bus stops of course, they can also be stopped by hand sign when you happen to meet one as a hiker on a lonely countryside road.
By car
You can reach the most places in Lapland by car, but traffic even on main roads is sparse and distances are great. Driving in Arctic conditions can be hazardous in winter. Winter tires M+S are mandatory from 1 December through the end of February. The most dangerous weather is in fact when the temperature is around freezing, when slippery but near-invisible black ice forms on the roads.
Stay very alert, particularly at dawn and dusk, for wild animals. Reindeer are a common cause of accidents, while collisions with much larger moose are rarer but very often lethal. If you hit a reindeer, you always must inform the locals, even if the animal seems to be unharmed, as they will in turn inform the owner of the deer. You won't be charged with anything unless you were drunk or speeding. Bring emergency supplies in case of a collision or breakdown, especially in winter. Locals will help if they can, but you may be in for a long, very cold wait.
Unlike moose which usually runs to the road suddenly and alone, the reindeers hang around peacefully in groups and collisions are usually easy to avoid when slowing down at once when first reindeers appear in sight.
Liikenneturva, the Finnish road safety agency, maintains a Tips for winter driving page in English. (http://www.liikenneturva....).