| Chicago Heights to Norwich | 3,982.67 mi (6,409.49 km) |
| Chicago Heights to Nottingham | 3,881.43 mi (6,246.55 km) |
| Chicago Heights to Nuneaton | 3,882.45 mi (6,248.21 km) |
| Chicago Heights to Oadby | 3,894.94 mi (6,268.30 km) |
| Chicago Heights to Oakengates | 3,840.12 mi (6,180.08 km) |
| Chicago Heights to Oakham | 3,905.65 mi (6,285.54 km) |
| Chicago Heights to Oldbury | 3,862.25 mi (6,215.69 km) |
| Chicago Heights to Oldham | 3,827.80 mi (6,160.25 km) |
| Chicago Heights to Ollerton | 3,878.85 mi (6,242.41 km) |
| Chicago Heights to Olton | 3,872.23 mi (6,231.76 km) |
| Chicago Heights to Omagh | 3,606.53 mi (5,804.16 km) |
| Chicago Heights to Ormesby | 3,832.99 mi (6,168.60 km) |
| Chicago Heights to Ormskirk | 3,798.44 mi (6,113.00 km) |
| Chicago Heights to Orpington | 3,977.76 mi (6,401.59 km) |
| Chicago Heights to Ossett | 3,843.77 mi (6,185.96 km) |
