| Olton to Nasaud | 1,212.94 mi (1,952.04 km) |
| Olton to Navodari | 1,490.60 mi (2,398.89 km) |
| Olton to Negresti-Oas | 1,154.02 mi (1,857.21 km) |
| Olton to Nehoiu | 1,356.91 mi (2,183.74 km) |
| Olton to Ocna Mures | 1,219.22 mi (1,962.15 km) |
| Olton to Odobesti | 1,374.03 mi (2,211.28 km) |
| Olton to Odorheiu Secuiesc | 1,281.76 mi (2,062.79 km) |
| Olton to Oltenita | 1,417.88 mi (2,281.86 km) |
| Olton to Onesti | 1,344.86 mi (2,164.35 km) |
| Olton to Oradea | 1,116.05 mi (1,796.11 km) |
| Olton to Orastie | 1,210.74 mi (1,948.49 km) |
| Olton to Oravita | 1,179.03 mi (1,897.46 km) |
| Olton to Orsova | 1,220.04 mi (1,963.47 km) |
| Olton to Otelu Rosu | 1,188.04 mi (1,911.96 km) |
| Olton to Otopeni | 1,376.82 mi (2,215.78 km) |
