Originally Posted by lowfareair

Update: Southwest on the phone says HOU and IAH are not co-terminals and they would need to charge the price difference in order to rebook him to HOU for today even though they are the ones who cancelled the flight to IAH today, otherwise he will need to wait until tomorrow to fly out. Waiting for a "coordinator" now. Any suggestions to get them to agree? They already refused us paying the extra points and then dropping the same amount into his account as a one time courtesy.

Edit: Turns out it was a misinformed CSR. She came back and said after speaking to someone, they can honor them as co-terminals with no change cost.