| Owings Mills to Olivares | 3,724.26 mi (5,993.62 km) |
| Owings Mills to Olivenza | 3,640.36 mi (5,858.60 km) |
| Owings Mills to Olot | 3,993.91 mi (6,427.57 km) |
| Owings Mills to Onate | 3,742.83 mi (6,023.51 km) |
| Owings Mills to Onda | 3,933.10 mi (6,329.72 km) |
| Owings Mills to Onteniente | 3,951.91 mi (6,359.98 km) |
| Owings Mills to Orihuela | 3,958.58 mi (6,370.72 km) |
| Owings Mills to Osuna | 3,781.72 mi (6,086.08 km) |
| Owings Mills to Ourense | 3,505.37 mi (5,641.35 km) |
| Owings Mills to Oviedo | 3,574.65 mi (5,752.85 km) |
| Owings Mills to Paiporta | 3,942.18 mi (6,344.32 km) |
| Owings Mills to Pajara | 3,604.07 mi (5,800.19 km) |
| Owings Mills to Palafolls | 4,021.73 mi (6,472.34 km) |
| Owings Mills to Palafrugell | 4,033.02 mi (6,490.52 km) |
| Owings Mills to Palamos | 4,033.67 mi (6,491.57 km) |
