| South Portland to Montana | 4,406.15 mi (7,091.01 km) |
| South Portland to Nova Zagora | 4,556.92 mi (7,333.66 km) |
| South Portland to Novi Iskar | 4,436.32 mi (7,139.57 km) |
| South Portland to Novi Pazar | 4,567.44 mi (7,350.58 km) |
| South Portland to Omurtag | 4,547.10 mi (7,317.85 km) |
| South Portland to Panagyurishte | 4,482.63 mi (7,214.09 km) |
| South Portland to Parvomay | 4,541.36 mi (7,308.61 km) |
| South Portland to Pavlikeni | 4,497.40 mi (7,237.87 km) |
| South Portland to Pazardzhik | 4,501.27 mi (7,244.10 km) |
| South Portland to Pernik | 4,431.66 mi (7,132.06 km) |
| South Portland to Peshtera | 4,506.91 mi (7,253.16 km) |
| South Portland to Petrich | 4,488.71 mi (7,223.88 km) |
| South Portland to Pleven | 4,462.43 mi (7,181.59 km) |
| South Portland to Plovdiv | 4,520.31 mi (7,274.74 km) |
| South Portland to Pomorie | 4,617.56 mi (7,431.24 km) |
