| Chicago Heights to Popovo | 5,280.88 mi (8,498.76 km) |
| Chicago Heights to Provadia | 5,331.38 mi (8,580.02 km) |
| Chicago Heights to Radnevo | 5,321.67 mi (8,564.40 km) |
| Chicago Heights to Radomir | 5,200.85 mi (8,369.96 km) |
| Chicago Heights to Rakitovo | 5,269.75 mi (8,480.84 km) |
| Chicago Heights to Rakovski | 5,287.23 mi (8,508.98 km) |
| Chicago Heights to Razgrad | 5,281.89 mi (8,500.38 km) |
| Chicago Heights to Razlog | 5,251.80 mi (8,451.96 km) |
| Chicago Heights to Ruse | 5,247.86 mi (8,445.62 km) |
| Chicago Heights to Samokov | 5,233.32 mi (8,422.22 km) |
| Chicago Heights to Sandanski | 5,260.06 mi (8,465.25 km) |
| Chicago Heights to Sevlievo | 5,256.77 mi (8,459.95 km) |
| Chicago Heights to Shumen | 5,308.87 mi (8,543.80 km) |
| Chicago Heights to Silistra | 5,279.10 mi (8,495.89 km) |
| Chicago Heights to Sliven | 5,317.18 mi (8,557.17 km) |
