| Dubuque to Zottegem | 4,202.60 mi (6,763.43 km) |
| Dubuque to Zulte | 4,187.27 mi (6,738.76 km) |
| Dubuque to Zwevegem | 4,187.91 mi (6,739.79 km) |
| Dubuque to Zwijndrecht | 4,209.01 mi (6,773.74 km) |
| Dubuque to Asenovgrad | 5,357.51 mi (8,622.08 km) |
| Dubuque to Aytos | 5,404.52 mi (8,697.74 km) |
| Dubuque to Balchik | 5,397.39 mi (8,686.27 km) |
| Dubuque to Bankya | 5,262.37 mi (8,468.97 km) |
| Dubuque to Bansko | 5,317.90 mi (8,558.34 km) |
| Dubuque to Berkovitsa | 5,235.30 mi (8,425.40 km) |
| Dubuque to Blagoevgrad | 5,295.06 mi (8,521.57 km) |
| Dubuque to Botevgrad | 5,275.22 mi (8,489.64 km) |
| Dubuque to Burgas | 5,422.14 mi (8,726.09 km) |
| Dubuque to Byala Slatina | 5,252.12 mi (8,452.47 km) |
| Dubuque to Chirpan | 5,364.17 mi (8,632.81 km) |
