| SeaTac to Castelfidardo | 5,604.11 mi (9,018.95 km) |
| SeaTac to Castelfiorentino | 5,532.81 mi (8,904.20 km) |
| SeaTac to Castelfranco di Sopra | 5,546.12 mi (8,925.62 km) |
| SeaTac to Castelfranco di Sotto | 5,521.41 mi (8,885.85 km) |
| SeaTac to Castelfranco Emilia | 5,475.32 mi (8,811.68 km) |
| SeaTac to Castelfranco Veneto | 5,432.54 mi (8,742.83 km) |
| SeaTac to Castellabate | 5,832.42 mi (9,386.38 km) |
| SeaTac to Castellammare del Golfo | 5,917.66 mi (9,523.56 km) |
| SeaTac to Castellammare di Stabia | 5,795.46 mi (9,326.89 km) |
| SeaTac to Castellamonte | 5,344.65 mi (8,601.38 km) |
| SeaTac to Castellana Grotte | 5,847.61 mi (9,410.81 km) |
| SeaTac to Castellaneta | 5,857.69 mi (9,427.04 km) |
| SeaTac to Castellanza | 5,361.12 mi (8,627.88 km) |
| SeaTac to Castellarano | 5,470.46 mi (8,803.86 km) |
| SeaTac to Castelleone | 5,401.67 mi (8,693.14 km) |
