| Portsmouth to Celbridge | 290.07 mi (466.82 km) |
| Portsmouth to Clondalkin | 284.50 mi (457.86 km) |
| Portsmouth to Clonmel | 303.74 mi (488.82 km) |
| Portsmouth to Cobh | 319.38 mi (513.99 km) |
| Portsmouth to Cork | 327.23 mi (526.62 km) |
| Portsmouth to Donegal | 395.94 mi (637.20 km) |
| Portsmouth to Douglas | 325.53 mi (523.89 km) |
| Portsmouth to Drogheda | 299.83 mi (482.53 km) |
| Portsmouth to Dublin | 281.23 mi (452.59 km) |
| Portsmouth to Dun Dealgan | 314.83 mi (506.67 km) |
| Portsmouth to Ennis | 365.13 mi (587.61 km) |
| Portsmouth to Enniscorthy | 262.38 mi (422.26 km) |
| Portsmouth to Finglas | 284.44 mi (457.77 km) |
| Portsmouth to Galway | 378.57 mi (609.25 km) |
| Portsmouth to Glanmire | 324.54 mi (522.30 km) |
