| Big Spring to Nasaud | 5,998.22 mi (9,653.20 km) |
| Big Spring to Navodari | 6,285.77 mi (10,115.97 km) |
| Big Spring to Negresti-Oas | 5,937.30 mi (9,555.17 km) |
| Big Spring to Nehoiu | 6,157.67 mi (9,909.82 km) |
| Big Spring to Ocna Mures | 6,025.18 mi (9,696.60 km) |
| Big Spring to Odobesti | 6,160.84 mi (9,914.92 km) |
| Big Spring to Odorheiu Secuiesc | 6,076.07 mi (9,778.49 km) |
| Big Spring to Oltenita | 6,233.73 mi (10,032.22 km) |
| Big Spring to Onesti | 6,125.93 mi (9,858.74 km) |
| Big Spring to Oradea | 5,927.28 mi (9,539.03 km) |
| Big Spring to Orastie | 6,030.14 mi (9,704.57 km) |
| Big Spring to Oravita | 6,018.35 mi (9,685.59 km) |
| Big Spring to Orsova | 6,058.33 mi (9,749.93 km) |
| Big Spring to Otelu Rosu | 6,017.87 mi (9,684.82 km) |
| Big Spring to Otopeni | 6,191.19 mi (9,963.76 km) |
