The airport with the most flight options and likely most cost efficient is Phoenix, Sky Harbor International (PHX). After arriving you will then drive approximately 2 hours north to Sedona, the location of the wedding and reception The other option to fly into is Flagstaff airport, FLG, which is much smaller, offering fewer flights. United and American fly through this airport via Denver, Phoenix and Dallas-Fort Worth. Upon arrival into FLG, you will then drive 29 miles south to Sedona.
There are shuttle services that will transport you from PHX round-trip. Once in Sedona, you will likely have limited need for a vehicle and they do utilize UBER.