| Olgiate Olona to Navodari | 966.11 mi (1,554.80 km) |
| Olgiate Olona to Negresti-Oas | 704.35 mi (1,133.54 km) |
| Olgiate Olona to Nehoiu | 842.36 mi (1,355.65 km) |
| Olgiate Olona to Ocna Mures | 719.49 mi (1,157.91 km) |
| Olgiate Olona to Odobesti | 875.61 mi (1,409.16 km) |
| Olgiate Olona to Odorheiu Secuiesc | 788.38 mi (1,268.78 km) |
| Olgiate Olona to Oltenita | 874.20 mi (1,406.88 km) |
| Olgiate Olona to Onesti | 858.55 mi (1,381.71 km) |
| Olgiate Olona to Oradea | 628.90 mi (1,012.11 km) |
| Olgiate Olona to Orastie | 689.59 mi (1,109.78 km) |
| Olgiate Olona to Oravita | 622.45 mi (1,001.74 km) |
| Olgiate Olona to Orsova | 660.31 mi (1,062.66 km) |
| Olgiate Olona to Otelu Rosu | 650.70 mi (1,047.21 km) |
| Olgiate Olona to Otopeni | 840.04 mi (1,351.92 km) |
| Olgiate Olona to Ovidiu | 964.29 mi (1,551.88 km) |
