| Welwyn Garden City to Nasaud | 1,140.11 mi (1,834.83 km) |
| Welwyn Garden City to Navodari | 1,415.69 mi (2,278.33 km) |
| Welwyn Garden City to Negresti-Oas | 1,081.74 mi (1,740.89 km) |
| Welwyn Garden City to Nehoiu | 1,282.04 mi (2,063.25 km) |
| Welwyn Garden City to Ocna Mures | 1,144.45 mi (1,841.82 km) |
| Welwyn Garden City to Odobesti | 1,300.23 mi (2,092.52 km) |
| Welwyn Garden City to Odorheiu Secuiesc | 1,207.76 mi (1,943.69 km) |
| Welwyn Garden City to Oltenita | 1,341.55 mi (2,159.02 km) |
| Welwyn Garden City to Onesti | 1,271.67 mi (2,046.56 km) |
| Welwyn Garden City to Oradea | 1,041.24 mi (1,675.72 km) |
| Welwyn Garden City to Orastie | 1,134.73 mi (1,826.17 km) |
| Welwyn Garden City to Oravita | 1,101.09 mi (1,772.03 km) |
| Welwyn Garden City to Orsova | 1,142.13 mi (1,838.07 km) |
| Welwyn Garden City to Otelu Rosu | 1,111.07 mi (1,788.09 km) |
| Welwyn Garden City to Otopeni | 1,300.73 mi (2,093.33 km) |
