1. By Road: The approximate driving distance between Columbus, Ohio, and Washington, D.C., is around 480 miles (772 kilometers). This distance can vary based on the exact routes taken and any traffic conditions.
2. By Air: The distance between Columbus, Ohio (CMH) and Washington Dulles International Airport (IAD) is approximately 350 miles (563 kilometers) as the crow flies. However, the actual flight distance can be slightly longer due to factors such as wind patterns and flight paths.
It's important to note that these distances are approximate and may vary depending on specific locations and transportation modes.