| Dallas to Oerlinghausen | 5,058.70 mi (8,141.19 km) |
| Dallas to Oestrich-Winkel | 5,106.57 mi (8,218.24 km) |
| Dallas to Offenburg | 5,160.77 mi (8,305.46 km) |
| Dallas to Oftersheim | 5,151.98 mi (8,291.31 km) |
| Dallas to Ohrdruf | 5,176.24 mi (8,330.36 km) |
| Dallas to Ohringen | 5,192.98 mi (8,357.29 km) |
| Dallas to Olbernhau | 5,275.99 mi (8,490.88 km) |
| Dallas to Olching | 5,300.31 mi (8,530.02 km) |
| Dallas to Oldenburg | 4,999.60 mi (8,046.08 km) |
| Dallas to Oldenburg in Holstein | 5,049.07 mi (8,125.69 km) |
| Dallas to Olfen | 5,021.22 mi (8,080.87 km) |
| Dallas to Olpe | 5,063.10 mi (8,148.27 km) |
| Dallas to Olsberg | 5,074.75 mi (8,167.02 km) |
| Dallas to Oranienburg | 5,189.01 mi (8,350.90 km) |
| Dallas to Ortenberg | 5,132.72 mi (8,260.32 km) |
