| Didcot to Nasaud | 1,183.50 mi (1,904.65 km) |
| Didcot to Navodari | 1,457.77 mi (2,346.06 km) |
| Didcot to Negresti-Oas | 1,125.42 mi (1,811.19 km) |
| Didcot to Nehoiu | 1,324.19 mi (2,131.08 km) |
| Didcot to Ocna Mures | 1,186.73 mi (1,909.85 km) |
| Didcot to Odobesti | 1,343.05 mi (2,161.43 km) |
| Didcot to Odorheiu Secuiesc | 1,250.48 mi (2,012.45 km) |
| Didcot to Oltenita | 1,382.60 mi (2,225.08 km) |
| Didcot to Onesti | 1,314.84 mi (2,116.02 km) |
| Didcot to Oradea | 1,083.53 mi (1,743.78 km) |
| Didcot to Orastie | 1,176.11 mi (1,892.77 km) |
| Didcot to Oravita | 1,140.66 mi (1,835.72 km) |
| Didcot to Orsova | 1,181.70 mi (1,901.77 km) |
| Didcot to Otelu Rosu | 1,151.63 mi (1,853.37 km) |
| Didcot to Otopeni | 1,341.99 mi (2,159.72 km) |
