FWIW, one common tactic for flying cheaper out of Tucson is to fly out of Phoenix.
Admittedly, it's another couple of hours of driving/riding, but popular enough that it supports a handful of shuttle services that are made up of mostly Tucson-Phoenix routes. This works well for Tucsonans, but it would extend your drive time.
A quick Yahoo Travel* check shows flights from ~$200 (Travel dates 13th or 14th and 18th) for PHX-IND.
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Admittedly, it's another couple of hours of driving/riding, but popular enough that it supports a handful of shuttle services that are made up of mostly Tucson-Phoenix routes. This works well for Tucsonans, but it would extend your drive time.
A quick Yahoo Travel* check shows flights from ~$200 (Travel dates 13th or 14th and 18th) for PHX-IND.
*Yahoo Travel is really Travelocity, I believe