Route 670 provides limited-stop East-West service between Chantilly and Franconia-Springfield Metro / VRE Station. The route travels primarily along the US 50, I-66 and I-495 corridors.
Popular locations along the route include:
- Monument Drive Transit Station
- Vienna Metro Station
- Springfield Town Center
- Chantilly Crossing Shopping Center
- Greenbriar Town Center
- Fairfax Towne Center
