| Trondheim to Navodari | 1,502.29 mi (2,417.70 km) |
| Trondheim to Negresti-Oas | 1,183.80 mi (1,905.14 km) |
| Trondheim to Nehoiu | 1,394.47 mi (2,244.18 km) |
| Trondheim to Ocna Mures | 1,286.98 mi (2,071.20 km) |
| Trondheim to Odobesti | 1,381.33 mi (2,223.04 km) |
| Trondheim to Odorheiu Secuiesc | 1,315.28 mi (2,116.74 km) |
| Trondheim to Oltenita | 1,482.15 mi (2,385.30 km) |
| Trondheim to Onesti | 1,344.47 mi (2,163.72 km) |
| Trondheim to Oradea | 1,213.59 mi (1,953.08 km) |
| Trondheim to Orastie | 1,312.42 mi (2,112.14 km) |
| Trondheim to Oravita | 1,345.25 mi (2,164.97 km) |
| Trondheim to Orsova | 1,375.54 mi (2,213.72 km) |
| Trondheim to Otelu Rosu | 1,322.30 mi (2,128.04 km) |
| Trondheim to Otopeni | 1,442.51 mi (2,321.50 km) |
| Trondheim to Ovidiu | 1,504.57 mi (2,421.37 km) |
