Originally Posted by
Nirvana91
If you have a flight A-B and then B-A, if you do it as a round trip, and the A-B portion decreased in price but the B-A portion increased in price, you couldn't make any modifications to the total itinerary without the change affecting both portions (so your B-A would go up in price also.
This bit of info is often repeated here, but its totally wrong. The website lets you select only one leg of a round trip to reprice, leaving the other leg untouched.
I'm not sure why this gets repeated so much.
There are many valid reasons to only book one ways on Southwest, but this isn't one of them.