| Westbrook to Orbetello | 3,939.29 mi (6,339.68 km) |
| Westbrook to Oria | 4,290.54 mi (6,904.95 km) |
| Westbrook to Oristano | 3,915.19 mi (6,300.89 km) |
| Westbrook to Orta Nova | 4,175.34 mi (6,719.56 km) |
| Westbrook to Orte | 3,989.42 mi (6,420.34 km) |
| Westbrook to Ortona | 4,080.21 mi (6,566.46 km) |
| Westbrook to Orvieto | 3,968.09 mi (6,386.02 km) |
| Westbrook to Orzinuovi | 3,780.97 mi (6,084.89 km) |
| Westbrook to Osimo | 3,999.07 mi (6,435.88 km) |
| Westbrook to Ospitaletto | 3,781.66 mi (6,086.00 km) |
| Westbrook to Ostuni | 4,279.13 mi (6,886.59 km) |
| Westbrook to Ottaviano | 4,140.46 mi (6,663.42 km) |
| Westbrook to Ovada | 3,751.66 mi (6,037.72 km) |
| Westbrook to Ozieri | 3,908.97 mi (6,290.87 km) |
| Westbrook to Paceco | 4,165.89 mi (6,704.35 km) |
