| Helena to Decatur (Alabama) | 1,543.71 mi (2,484.36 km) |
| Helena to Decatur (Georgia) | 1,697.39 mi (2,731.68 km) |
| Helena to Decatur (Illinois) | 1,246.39 mi (2,005.87 km) |
| Helena to Deer Park (New York) | 1,954.70 mi (3,145.78 km) |
| Helena to Deer Park (Texas) | 1,479.36 mi (2,380.81 km) |
| Helena to Deerfield (Illinois) | 1,226.78 mi (1,974.31 km) |
| Helena to Deerfield Beach (Florida) | 2,234.00 mi (3,595.28 km) |
| Helena to Defiance (Ohio) | 1,415.96 mi (2,278.77 km) |
| Helena to DeForest (Wisconsin) | 1,129.53 mi (1,817.80 km) |
| Helena to DeKalb (Illinois) | 1,190.84 mi (1,916.47 km) |
| Helena to Del Aire (California) | 937.08 mi (1,508.08 km) |
| Helena to Del City (Oklahoma) | 1,078.69 mi (1,735.99 km) |
| Helena to Del Rio (Texas) | 1,332.76 mi (2,144.87 km) |
| Helena to DeLand (Florida) | 2,049.56 mi (3,298.45 km) |
| Helena to Delano (California) | 836.87 mi (1,346.81 km) |
