The best airport to fly into is Detroit
Wayne County (DTW), also known as "Detroit Metro". Ann Arbor
is about a 20-30 minute ride away.
Another option is Commuter
Express, a shuttle company that provides cheaper transport from
Coming on I-94: Take the State Rd. (= State St.) exit, and go north on State St. all the way into the center of Ann Arbor. S. University will be the first street (on your right) as you approach campus. After that, there is E. William (on your left), and then N. University on your right (the street where the Michigan League is). If you go one more block on State St. and make a left on E. Liberty St., you will find parking structures.
There is an Amtrak station in Ann
Arbor. You can visit the following web-site for info on schedules,