463 miles. D3.
Here's another question - how many trips to watch baseball per season, on average?
Right now I'm thinking one visit per month, and one more for post season tournament if they make it, or two during the final month if they're not.
I agree with ILVBB rule. We were a three hour SW flight away and direct so we could leave on Friday afternoon and make the Friday eve start in a pinch.
We looked over the schedule and in general went ~once per month, almost a week during Easter break when they played 5-6 games, plus conference tournaments, Regionals and one CWS. My son's team won 3 of 4 conference championships, and we went to four straight Regionals, so we lucky (not from a financial point of view ) but hey you only are in this position once in your life.
Plan in advance and get the SW credit card at the right time to earn enough points to get a free companion pass. A couple of other cost savers. Pre-book cars on Priceline and get them much cheaper, also it is not well known, but cars are much cheaper if rented off airport. Most parent groups work out deals with local hotels. Finally plan on spending A LOT more than you originally budgeted for stock up food runs, dinners out with roommates, teammates, Margaritas!, it all adds up.