| Great Falls to Olivares | 4,979.92 mi (8,014.41 km) |
| Great Falls to Olivenza | 4,880.75 mi (7,854.81 km) |
| Great Falls to Olot | 5,040.51 mi (8,111.92 km) |
| Great Falls to Onate | 4,830.97 mi (7,774.70 km) |
| Great Falls to Onda | 5,063.15 mi (8,148.35 km) |
| Great Falls to Onteniente | 5,110.42 mi (8,224.42 km) |
| Great Falls to Orihuela | 5,136.67 mi (8,266.66 km) |
| Great Falls to Osuna | 5,028.54 mi (8,092.66 km) |
| Great Falls to Ourense | 4,673.05 mi (7,520.55 km) |
| Great Falls to Oviedo | 4,695.24 mi (7,556.26 km) |
| Great Falls to Paiporta | 5,085.56 mi (8,184.42 km) |
| Great Falls to Pajara | 5,113.05 mi (8,228.66 km) |
| Great Falls to Palafolls | 5,076.27 mi (8,169.47 km) |
| Great Falls to Palafrugell | 5,076.78 mi (8,170.29 km) |
| Great Falls to Palamos | 5,079.45 mi (8,174.58 km) |
