| Duncan to Devnya | 6,060.97 mi (9,754.19 km) |
| Duncan to Dimitrovgrad | 6,052.21 mi (9,740.08 km) |
| Duncan to Dobrich | 6,051.99 mi (9,739.74 km) |
| Duncan to Dospat | 6,021.00 mi (9,689.87 km) |
| Duncan to Dupnitsa | 5,952.92 mi (9,580.30 km) |
| Duncan to Elhovo | 6,080.18 mi (9,785.10 km) |
| Duncan to Etropole | 5,956.62 mi (9,586.26 km) |
| Duncan to Gabrovo | 6,001.92 mi (9,659.16 km) |
| Duncan to Gorna Oryahovitsa | 6,001.32 mi (9,658.19 km) |
| Duncan to Gotse Delchev | 6,009.43 mi (9,671.24 km) |
| Duncan to Harmanli | 6,068.64 mi (9,766.53 km) |
| Duncan to Haskovo | 6,056.89 mi (9,747.62 km) |
| Duncan to Ihtiman | 5,969.58 mi (9,607.11 km) |
| Duncan to Isperih | 6,010.66 mi (9,673.22 km) |
| Duncan to Kardzhali | 6,063.99 mi (9,759.05 km) |
