| Boston to Nasaud | 1,144.45 mi (1,841.81 km) |
| Boston to Navodari | 1,424.83 mi (2,293.04 km) |
| Boston to Negresti-Oas | 1,084.90 mi (1,745.97 km) |
| Boston to Nehoiu | 1,291.22 mi (2,078.02 km) |
| Boston to Ocna Mures | 1,153.55 mi (1,856.46 km) |
| Boston to Odobesti | 1,306.66 mi (2,102.86 km) |
| Boston to Odorheiu Secuiesc | 1,214.80 mi (1,955.04 km) |
| Boston to Oltenita | 1,354.73 mi (2,180.22 km) |
| Boston to Onesti | 1,276.67 mi (2,054.60 km) |
| Boston to Oradea | 1,050.62 mi (1,690.82 km) |
| Boston to Orastie | 1,147.26 mi (1,846.33 km) |
| Boston to Oravita | 1,119.85 mi (1,802.23 km) |
| Boston to Orsova | 1,160.73 mi (1,868.01 km) |
| Boston to Otelu Rosu | 1,126.55 mi (1,813.00 km) |
| Boston to Otopeni | 1,313.25 mi (2,113.47 km) |
