Changing flight with Early Bird
 

I am not very experienced with Southwest, but if you book a flight and pay for Early bird, but then have to change your flights, how does it work. Do you get to keep the early bird on the new flight? Is the money refunded? Is the money non-refundable?

As long as you don't cancel and just change your flight... it stays with your updated reservation. The exception I believe would be if you change your flight less than 25hrs before departure, then it doesn't carry over.

Update: here is Southwest's official policy:
If an EarlyBird Check-In Customer chooses to change a flight, will the EarlyBird Check-In options transfer to the new flight?It depends. EarlyBird Check-In is tied to the Customer’s reservation for which the EarlyBird Check-In purchase was made and will be transferred to the Customer’s new flight if he/she changes the flight at least 25 hours prior to the original flight’s scheduled departure time and so long as the change is to a flight that will depart in more than 25 hours. Since EarlyBird Check-In is associated with a reservation, any changes must be made within the same reservation record (same confirmation number) in which the Customer purchased EarlyBird Check-In.