| Gretna to Hoyo de Manzanares | 4,723.61 mi (7,601.91 km) |
| Gretna to Huelva | 4,655.16 mi (7,491.76 km) |
| Gretna to Huercal de Almeria | 4,895.06 mi (7,877.83 km) |
| Gretna to Huercal-Overa | 4,906.48 mi (7,896.22 km) |
| Gretna to Huesca | 4,850.87 mi (7,806.72 km) |
| Gretna to Huetor Vega | 4,830.33 mi (7,773.66 km) |
| Gretna to Huetor-Tajar | 4,804.78 mi (7,732.55 km) |
| Gretna to Humanes de Madrid | 4,735.96 mi (7,621.80 km) |
| Gretna to Ibi | 4,939.49 mi (7,949.34 km) |
| Gretna to Ibiza | 5,029.96 mi (8,094.93 km) |
| Gretna to Icod de los Vinos | 4,346.89 mi (6,995.64 km) |
| Gretna to Igualada | 4,962.22 mi (7,985.92 km) |
| Gretna to Illescas | 4,739.20 mi (7,627.00 km) |
| Gretna to Inca | 5,078.00 mi (8,172.26 km) |
| Gretna to Ingenio | 4,429.60 mi (7,128.76 km) |
