Because ILM is so far away from ICT, we recommend simply booking a flight. Other options to ILM do exist, but going by plane will save you valuable time. Book as soon as you can, as there may be limited availability.
For these medium length trips, it's important to book your tickets as soon as possible. While there are flight, bus or by car transportation options available, the sooner to book the better. While prices for buses or trains might not fluctuate as much as flights, their availability certainly will. It's recommended to book these flights at least 2 weeks away, but even more if you are able. Shuttle service may be available to ILM. If you're traveling with a large group, you should probably take a shuttle as it will reduce the price per person. Alternatively, there are shared shuttle services available. With this option, you'll want to book as soon as possible to allow the shuttle service enough time to coordinate your pickup and dropoff.