Originally Posted by KevinSFO

I have a similar situation on my SFO-LAX-PPT flight in July. I paid with $ at a great fare, but I have a seven hour connection at LAX. I called Delta and was told that changing to a later first flight would add about $700 to the price, despite the fact that I could buy a one-way SFO-LAX on DL at the desired time for about $130. It's really hard to find the logic in this stuff, but I'm sure someone in Delta Revenue Management has a spreadsheet which says this makes sense.