| Willimantic to Olivares | 3,443.80 mi (5,542.26 km) |
| Willimantic to Olivenza | 3,358.72 mi (5,405.33 km) |
| Willimantic to Olot | 3,706.47 mi (5,964.98 km) |
| Willimantic to Onate | 3,455.80 mi (5,561.57 km) |
| Willimantic to Onda | 3,647.60 mi (5,870.25 km) |
| Willimantic to Onteniente | 3,667.47 mi (5,902.21 km) |
| Willimantic to Orihuela | 3,674.96 mi (5,914.27 km) |
| Willimantic to Osuna | 3,500.95 mi (5,634.23 km) |
| Willimantic to Ourense | 3,220.04 mi (5,182.15 km) |
| Willimantic to Oviedo | 3,288.06 mi (5,291.62 km) |
| Willimantic to Paiporta | 3,657.15 mi (5,885.62 km) |
| Willimantic to Pajara | 3,348.90 mi (5,389.53 km) |
| Willimantic to Palafolls | 3,734.47 mi (6,010.05 km) |
| Willimantic to Palafrugell | 3,745.59 mi (6,027.94 km) |
| Willimantic to Palamos | 3,746.27 mi (6,029.04 km) |
