Maybe you're the sort of traveler who loves planning your trip down to the finest detail. Or perhaps you'd rather hop in your rental car and play it by ear. However you like to go about it, there are some basic facts about Rockford, IL Airport (RFD-Greater Rockford) you should know.Rockford, IL Airport (RFD-Greater Rockford) is situated 5 miles to the south from downtown Rockford.