| Helena to Dallas (Oregon) | 556.00 mi (894.80 km) |
| Helena to Dallas (Texas) | 1,247.31 mi (2,007.35 km) |
| Helena to Dalton (Georgia) | 1,623.97 mi (2,613.53 km) |
| Helena to Daly City (California) | 814.37 mi (1,310.60 km) |
| Helena to Damascus (Maryland) | 1,816.45 mi (2,923.30 km) |
| Helena to Damascus (Oregon) | 506.33 mi (814.86 km) |
| Helena to Dana Point (California) | 954.50 mi (1,536.11 km) |
| Helena to Danbury (Connecticut) | 1,929.36 mi (3,105.01 km) |
| Helena to Dania Beach (Florida) | 2,244.99 mi (3,612.95 km) |
| Helena to Danville (California) | 790.97 mi (1,272.95 km) |
| Helena to Danville (Illinois) | 1,298.17 mi (2,089.21 km) |
| Helena to Danville (Indiana) | 1,362.48 mi (2,192.70 km) |
| Helena to Danville (Kentucky) | 1,517.15 mi (2,441.62 km) |
| Helena to Danville (Virginia) | 1,805.57 mi (2,905.78 km) |
| Helena to Daphne (Alabama) | 1,695.25 mi (2,728.25 km) |
