| Westlake to Orbetello | 4,518.16 mi (7,271.27 km) |
| Westlake to Oria | 4,865.00 mi (7,829.47 km) |
| Westlake to Oristano | 4,504.84 mi (7,249.84 km) |
| Westlake to Orta Nova | 4,750.52 mi (7,645.22 km) |
| Westlake to Orte | 4,566.41 mi (7,348.93 km) |
| Westlake to Ortona | 4,654.32 mi (7,490.41 km) |
| Westlake to Orvieto | 4,544.69 mi (7,313.97 km) |
| Westlake to Orzinuovi | 4,351.71 mi (7,003.40 km) |
| Westlake to Osimo | 4,570.92 mi (7,356.19 km) |
| Westlake to Ospitaletto | 4,351.60 mi (7,003.23 km) |
| Westlake to Ostuni | 4,852.96 mi (7,810.08 km) |
| Westlake to Ottaviano | 4,719.12 mi (7,594.69 km) |
| Westlake to Ovada | 4,327.08 mi (6,963.77 km) |
| Westlake to Ozieri | 4,496.33 mi (7,236.14 km) |
| Westlake to Paceco | 4,755.10 mi (7,652.59 km) |
