South Bend - This is the closest, but smallest airport. It is about 40 minutes away with no public transportation to St. Joe.

Grand Rapids - This is about 1h20min away from St. Joe and is medium sized, with options for rental cars.

Chicago Airports - THIS IS IN THE CENTRAL TIME ZONE. Depending on O'Hare or Midway as well as the time of day because of traffic, these airports are from 1h45min - 2h30min away by car, however these will likely have the cheapest flights. There is a train that leaves Chicago at 6:30pm and arrives in downtown St. Joe at 9:15pm (with the time change) with a return on Sunday morning, leaving at 8:10am and arriving at 9:10am. This is a great option, however unless you are staying at The Boulevard in downtown St. Joe you will need a car.