| Boulder to Santa Ursula | 4,926.00 mi (7,927.63 km) |
| Boulder to Santander | 4,878.33 mi (7,850.91 km) |
| Boulder to Santany | 5,335.84 mi (8,587.20 km) |
| Boulder to Santiago de Compostela | 4,709.24 mi (7,578.79 km) |
| Boulder to Santiago del Teide | 4,915.40 mi (7,910.56 km) |
| Boulder to Santiponce | 5,038.65 mi (8,108.92 km) |
| Boulder to Santomera | 5,224.01 mi (8,407.22 km) |
| Boulder to Santona | 4,893.07 mi (7,874.64 km) |
| Boulder to Santurce-Antiguo | 4,914.71 mi (7,909.46 km) |
| Boulder to Sarria | 4,759.65 mi (7,659.92 km) |
| Boulder to Sauzal | 4,926.52 mi (7,928.48 km) |
| Boulder to Sedavi | 5,190.80 mi (8,353.78 km) |
| Boulder to Segorbe | 5,167.68 mi (8,316.57 km) |
| Boulder to Segovia | 4,971.48 mi (8,000.83 km) |
| Boulder to Senmanat | 5,193.76 mi (8,358.54 km) |
