| Donostia to Castelfidardo | 778.47 mi (1,252.82 km) |
| Donostia to Castelfiorentino | 648.93 mi (1,044.35 km) |
| Donostia to Castelfranco di Sopra | 678.41 mi (1,091.79 km) |
| Donostia to Castelfranco di Sotto | 637.82 mi (1,026.47 km) |
| Donostia to Castelfranco Emilia | 653.46 mi (1,051.64 km) |
| Donostia to Castelfranco Veneto | 703.66 mi (1,132.43 km) |
| Donostia to Castellabate | 895.41 mi (1,441.02 km) |
| Donostia to Castellammare del Golfo | 858.71 mi (1,381.95 km) |
| Donostia to Castellammare di Stabia | 862.80 mi (1,388.54 km) |
| Donostia to Castellamonte | 499.23 mi (803.44 km) |
| Donostia to Castellana Grotte | 993.59 mi (1,599.03 km) |
| Donostia to Castellaneta | 986.81 mi (1,588.12 km) |
| Donostia to Castellanza | 558.93 mi (899.51 km) |
| Donostia to Castellarano | 640.10 mi (1,030.15 km) |
| Donostia to Castelleone | 595.75 mi (958.76 km) |
