| Killarney to Navodari | 1,811.90 mi (2,915.98 km) |
| Killarney to Negresti-Oas | 1,478.60 mi (2,379.58 km) |
| Killarney to Nehoiu | 1,678.33 mi (2,701.00 km) |
| Killarney to Ocna Mures | 1,540.85 mi (2,479.75 km) |
| Killarney to Odobesti | 1,697.00 mi (2,731.06 km) |
| Killarney to Odorheiu Secuiesc | 1,604.48 mi (2,582.15 km) |
| Killarney to Oltenita | 1,736.41 mi (2,794.48 km) |
| Killarney to Onesti | 1,668.56 mi (2,685.29 km) |
| Killarney to Oradea | 1,437.65 mi (2,313.67 km) |
| Killarney to Orastie | 1,530.11 mi (2,462.47 km) |
| Killarney to Oravita | 1,493.26 mi (2,403.17 km) |
| Killarney to Orsova | 1,534.29 mi (2,469.20 km) |
| Killarney to Otelu Rosu | 1,505.17 mi (2,422.33 km) |
| Killarney to Otopeni | 1,695.92 mi (2,729.31 km) |
| Killarney to Ovidiu | 1,811.45 mi (2,915.25 km) |
