| Constanta to Olivenza | 1,874.15 mi (3,016.16 km) |
| Constanta to Olot | 1,318.86 mi (2,122.50 km) |
| Constanta to Onate | 1,546.32 mi (2,488.57 km) |
| Constanta to Onda | 1,502.32 mi (2,417.75 km) |
| Constanta to Onteniente | 1,548.78 mi (2,492.51 km) |
| Constanta to Orihuela | 1,586.28 mi (2,552.88 km) |
| Constanta to Osuna | 1,816.76 mi (2,923.80 km) |
| Constanta to Ourense | 1,825.90 mi (2,938.50 km) |
| Constanta to Oviedo | 1,708.67 mi (2,749.84 km) |
| Constanta to Paiporta | 1,523.37 mi (2,451.63 km) |
| Constanta to Pajara | 2,583.23 mi (4,157.31 km) |
| Constanta to Palafolls | 1,315.42 mi (2,116.96 km) |
| Constanta to Palafrugell | 1,290.28 mi (2,076.51 km) |
| Constanta to Palamos | 1,293.31 mi (2,081.39 km) |
| Constanta to Palencia | 1,668.65 mi (2,685.43 km) |
