For friends traveling in from outside of the greater Wichita area, flying to (ICT) Wichita Dwight D. Eisenhower National Airport is the easiest and closest option for the wedding. If this is your first time visiting the Midwest, consider flying into Kansas City first (KCI) to enjoy some proper BBQ before driving down to Wichita (~3 hour drive).
The city isn't accessible via public transit so you'll want to rent a car or carpool with other attendees for the weekend.