Its eastern terminus is the intersection at the Trans-Canada Highway (Route 1) in the Town of Badger,[1] and the route ends at the Town of Buchans.

[2] The intersection at the Trans-Canada Highway is very unusual in nature, with a median at the access, and motorists would face a stop signs at the Trans-Canada Highway intersection soon after a stop sign upon returning from their journey on Route 370.

Route 370 begins at a Y-Intersection between Main Street and Lakeview Avenue in Buchans and heads east to leave the town, passing along the northern shores of Beothuk Lake for several kilometres, crossing the Buchans River and passing by Mary March Wilderness Park.

It then passes through Buchans Junction, where it crosses the Mary March River and has an intersection with a local road leading to Millertown.

The highway now winds its way through hilly rural terrain for several kilometres following the Exploits River, where it has an intersection with Route 371 (Millertown Junction Road), an unsigned gravel road.