| Boom to Navodari | 1,213.33 mi (1,952.67 km) |
| Boom to Negresti-Oas | 881.15 mi (1,418.07 km) |
| Boom to Nehoiu | 1,079.72 mi (1,737.63 km) |
| Boom to Ocna Mures | 942.19 mi (1,516.31 km) |
| Boom to Odobesti | 1,098.41 mi (1,767.73 km) |
| Boom to Odorheiu Secuiesc | 1,005.85 mi (1,618.76 km) |
| Boom to Oltenita | 1,138.98 mi (1,833.00 km) |
| Boom to Onesti | 1,070.25 mi (1,722.40 km) |
| Boom to Oradea | 838.99 mi (1,350.22 km) |
| Boom to Orastie | 932.16 mi (1,500.16 km) |
| Boom to Oravita | 899.11 mi (1,446.97 km) |
| Boom to Orsova | 940.12 mi (1,512.98 km) |
| Boom to Otelu Rosu | 908.58 mi (1,462.22 km) |
| Boom to Otopeni | 1,098.15 mi (1,767.31 km) |
| Boom to Ovidiu | 1,212.91 mi (1,951.99 km) |
