| Ano Syros to Navodari | 512.69 mi (825.10 km) |
| Ano Syros to Negresti-Oas | 723.77 mi (1,164.79 km) |
| Ano Syros to Nehoiu | 550.86 mi (886.52 km) |
| Ano Syros to Ocna Mures | 619.99 mi (997.77 km) |
| Ano Syros to Odobesti | 585.36 mi (942.05 km) |
| Ano Syros to Odorheiu Secuiesc | 612.78 mi (986.18 km) |
| Ano Syros to Oltenita | 467.44 mi (752.27 km) |
| Ano Syros to Onesti | 616.12 mi (991.55 km) |
| Ano Syros to Oradea | 681.92 mi (1,097.44 km) |
| Ano Syros to Orastie | 586.94 mi (944.59 km) |
| Ano Syros to Oravita | 550.26 mi (885.56 km) |
| Ano Syros to Orsova | 519.24 mi (835.63 km) |
| Ano Syros to Otelu Rosu | 572.78 mi (921.80 km) |
| Ano Syros to Otopeni | 494.33 mi (795.54 km) |
| Ano Syros to Ovidiu | 508.41 mi (818.20 km) |
