| Oldenzaal to Navodari | 1,132.74 mi (1,822.97 km) |
| Oldenzaal to Negresti-Oas | 790.67 mi (1,272.46 km) |
| Oldenzaal to Nehoiu | 999.39 mi (1,608.36 km) |
| Oldenzaal to Ocna Mures | 861.97 mi (1,387.21 km) |
| Oldenzaal to Odobesti | 1,013.37 mi (1,630.86 km) |
| Oldenzaal to Odorheiu Secuiesc | 921.94 mi (1,483.72 km) |
| Oldenzaal to Oltenita | 1,065.56 mi (1,714.85 km) |
| Oldenzaal to Onesti | 982.84 mi (1,581.74 km) |
| Oldenzaal to Oradea | 759.55 mi (1,222.37 km) |
| Oldenzaal to Orastie | 858.23 mi (1,381.19 km) |
| Oldenzaal to Oravita | 837.44 mi (1,347.73 km) |
| Oldenzaal to Orsova | 877.84 mi (1,412.75 km) |
| Oldenzaal to Otelu Rosu | 840.39 mi (1,352.47 km) |
| Oldenzaal to Otopeni | 1,023.67 mi (1,647.44 km) |
| Oldenzaal to Ovidiu | 1,132.76 mi (1,822.99 km) |
