| SeaTac to Castelletto sopra Ticino | 5,348.50 mi (8,607.57 km) |
| SeaTac to Castelli Calepio | 5,385.10 mi (8,666.48 km) |
| SeaTac to Castelnovo ne' Monti | 5,468.89 mi (8,801.33 km) |
| SeaTac to Castelnuovo Berardenga | 5,561.37 mi (8,950.15 km) |
| SeaTac to Castelnuovo di Porto | 5,659.24 mi (9,107.67 km) |
| SeaTac to Castelnuovo di Verona | 5,418.32 mi (8,719.95 km) |
| SeaTac to Castelnuovo Rangone | 5,475.17 mi (8,811.43 km) |
| SeaTac to Castelvetrano | 5,936.20 mi (9,553.39 km) |
| SeaTac to Castelvetro di Modena | 5,478.57 mi (8,816.90 km) |
| SeaTac to Castenaso | 5,490.79 mi (8,836.57 km) |
| SeaTac to Castenedolo | 5,404.58 mi (8,697.82 km) |
| SeaTac to Castiglion Fiorentino | 5,571.85 mi (8,967.02 km) |
| SeaTac to Castiglione del Lago | 5,587.39 mi (8,992.03 km) |
| SeaTac to Castiglione delle Stiviere | 5,413.77 mi (8,712.62 km) |
| SeaTac to Castrolibero | 5,921.76 mi (9,530.15 km) |
