I agree with SD. Go ahead and book the flights(on SW assuming you are from KC) to SD and PHX now since they will be the ones that go up the most as we get closer. Hotel rooms probably wont be too big of an issue to either SA or PHX unless you have specific places you want to stay, can probably wait a week or two.
On tickets, I would either ask the highest ranked donor you know to put you on their order, put your own order in, or wait until the day before the game and scalp. With only 2 of you, unless you have certain people you want to sit by, you should be able to snag some for a good price.