This is a list of large cities closest to SIU. A big city usually has a population of at least 200,000 and you can often fly into a major airport. If you need to book a flight, search for the nearest airport to SIU. You can also look for cities 4 hours from SIU (or 3 hours or 2 hours or 1 hour) or just search in general for more cities near SIU.
Travelmath helps you find cities close to your location. You can use it to look for nearby towns and suburbs if you live in a metropolis area, or you can search for cities near any airport, zip code, or tourist landmark. You'll get a map of the local cities, including the distance and information on each town. This can help in planning a trip or just learning more about a neighboring city so you can discover new places.