| Delfzijl to Orbetello | 778.20 mi (1,252.40 km) |
| Delfzijl to Oria | 1,018.27 mi (1,638.75 km) |
| Delfzijl to Oristano | 931.08 mi (1,498.43 km) |
| Delfzijl to Orta Nova | 924.30 mi (1,487.52 km) |
| Delfzijl to Orte | 792.24 mi (1,274.99 km) |
| Delfzijl to Ortona | 833.37 mi (1,341.18 km) |
| Delfzijl to Orvieto | 771.17 mi (1,241.09 km) |
| Delfzijl to Orzinuovi | 564.56 mi (908.57 km) |
| Delfzijl to Osimo | 743.47 mi (1,196.50 km) |
| Delfzijl to Ospitaletto | 555.66 mi (894.24 km) |
| Delfzijl to Ostuni | 1,002.64 mi (1,613.59 km) |
| Delfzijl to Ottaviano | 931.71 mi (1,499.44 km) |
| Delfzijl to Ovada | 605.75 mi (974.87 km) |
| Delfzijl to Ozieri | 886.21 mi (1,426.21 km) |
| Delfzijl to Paceco | 1,094.06 mi (1,760.72 km) |
