| Skien to Navodari | 1,302.57 mi (2,096.28 km) |
| Skien to Negresti-Oas | 964.50 mi (1,552.21 km) |
| Skien to Nehoiu | 1,183.59 mi (1,904.80 km) |
| Skien to Ocna Mures | 1,063.55 mi (1,711.62 km) |
| Skien to Odobesti | 1,177.98 mi (1,895.77 km) |
| Skien to Odorheiu Secuiesc | 1,101.92 mi (1,773.36 km) |
| Skien to Oltenita | 1,267.87 mi (2,040.44 km) |
| Skien to Onesti | 1,141.58 mi (1,837.20 km) |
| Skien to Oradea | 979.28 mi (1,576.00 km) |
| Skien to Orastie | 1,082.04 mi (1,741.37 km) |
| Skien to Oravita | 1,102.01 mi (1,773.52 km) |
| Skien to Orsova | 1,135.80 mi (1,827.90 km) |
| Skien to Otelu Rosu | 1,084.95 mi (1,746.07 km) |
| Skien to Otopeni | 1,226.37 mi (1,973.65 km) |
| Skien to Ovidiu | 1,304.23 mi (2,098.96 km) |
