By plane
"à re Ãstersund Airport" is located on "Frösön", just outside town.There are four airlines operating at "à re Ãstersund Airport".
Stockholm Arlanda - Ãstersund:
Scandinavian Airlines SAS
Flynordic
UmeÃ¥ - Ãstersund
Nordic Regional
LuleÃ¥-Ãstersund
Nordic Regional
Kiruna-Ãstersund
Flynordic
Helsinki-Ãstersund Only during the winter
Finnair
By train
SJ the national train line (http://www.sj.se/) has regular service between Ãstersund and many cities in Sweden. Price and time wise it's more expensive than flying, but if you wish to see the country, a good option indeed. Expect times to and from Stockholm to run anywhere from 5.5 hours on the X2000 their high speed train to 6.5 hours on a slightly slower train. Also keep in mind that swedish rail traffic has seen severe disruptions in service due to snow the last five years with trains being delayed for several hours and canceld.
Another nice way to go to Ãstersund is by the Inlandsbanan. It's a slow diesel train that starts in Mora and ends in Gällivare. They make a stop in Ãstersund, so you can get on and off the train. The train is rather touristic, but it's a very special way to get to Ãstersund.