Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Springfield to Dubuque as you normally would.
SGF and DBQ are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. SGF to DBQ refers to a flight route from Springfield-Branson Airport to Dubuque Airport.