| Duncan to Hoyo de Manzanares | 4,907.11 mi (7,897.23 km) |
| Duncan to Huelva | 4,878.33 mi (7,850.91 km) |
| Duncan to Huercal de Almeria | 5,106.11 mi (8,217.48 km) |
| Duncan to Huercal-Overa | 5,111.56 mi (8,226.26 km) |
| Duncan to Huesca | 5,009.76 mi (8,062.42 km) |
| Duncan to Huetor Vega | 5,043.05 mi (8,116.01 km) |
| Duncan to Huetor-Tajar | 5,018.76 mi (8,076.92 km) |
| Duncan to Humanes de Madrid | 4,922.65 mi (7,922.24 km) |
| Duncan to Ibi | 5,129.26 mi (8,254.75 km) |
| Duncan to Ibiza | 5,210.18 mi (8,384.98 km) |
| Duncan to Icod de los Vinos | 4,675.82 mi (7,525.01 km) |
| Duncan to Igualada | 5,118.99 mi (8,238.21 km) |
| Duncan to Illescas | 4,927.11 mi (7,929.42 km) |
| Duncan to Inca | 5,246.04 mi (8,442.68 km) |
| Duncan to Ingenio | 4,757.80 mi (7,656.95 km) |
