Arlanda - Mora by car 310 km:
If you are going by car the best route would be E4 and Route 80 and 70 (marked blue).
Take the exit from Arlanda (3 km) towards Sundsvall/Uppsala. At Gävle (135 km) take the exit onto Route 56/Route80 towards Falun/Sandviken. Stay on Route 80 pass Hofors and Falun. Just before Rättvikturn right at Route 70 towards Rättvik and stay on Route 70 towards Mora.
Choose the road marked with black if you prefer a more tourist route.