| Estoril to Idar-Oberstein | 1,119.36 mi (1,801.43 km) |
| Estoril to Idstein | 1,174.60 mi (1,890.34 km) |
| Estoril to Illertissen | 1,172.21 mi (1,886.49 km) |
| Estoril to Illingen | 1,096.25 mi (1,764.24 km) |
| Estoril to Ilmenau | 1,288.99 mi (2,074.43 km) |
| Estoril to Ilsede | 1,325.18 mi (2,132.67 km) |
| Estoril to Ilsenburg | 1,325.92 mi (2,133.87 km) |
| Estoril to Ilsfeld | 1,166.64 mi (1,877.53 km) |
| Estoril to Ilvesheim | 1,156.03 mi (1,860.45 km) |
| Estoril to Immenstadt im Allgau | 1,158.22 mi (1,863.98 km) |
| Estoril to Ingelheim | 1,156.84 mi (1,861.75 km) |
| Estoril to Ingolstadt | 1,244.04 mi (2,002.09 km) |
| Estoril to Iserlohn | 1,203.14 mi (1,936.26 km) |
| Estoril to Isernhagen-Sud | 1,321.38 mi (2,126.55 km) |
| Estoril to Ismaning | 1,238.49 mi (1,993.16 km) |
