| Willoughby to Olivares | 3,890.19 mi (6,260.66 km) |
| Willoughby to Olivenza | 3,802.29 mi (6,119.20 km) |
| Willoughby to Olot | 4,122.29 mi (6,634.19 km) |
| Willoughby to Onate | 3,875.93 mi (6,237.70 km) |
| Willoughby to Onda | 4,076.74 mi (6,560.88 km) |
| Willoughby to Onteniente | 4,101.28 mi (6,600.37 km) |
| Willoughby to Orihuela | 4,111.83 mi (6,617.35 km) |
| Willoughby to Osuna | 3,946.51 mi (6,351.29 km) |
| Willoughby to Ourense | 3,651.03 mi (5,875.77 km) |
| Willoughby to Oviedo | 3,711.85 mi (5,973.65 km) |
| Willoughby to Paiporta | 4,088.51 mi (6,579.82 km) |
| Willoughby to Pajara | 3,820.99 mi (6,149.29 km) |
| Willoughby to Palafolls | 4,151.98 mi (6,681.97 km) |
| Willoughby to Palafrugell | 4,161.37 mi (6,697.08 km) |
| Willoughby to Palamos | 4,162.41 mi (6,698.76 km) |
