Jackson Hole Airport is the closest airline service to the south entrance of Yellowstone National Park. The best way to visit the National Park is definitely via road trip. To enjoy a scenic road trip, you can rent a car at the airport or in other car rental operators in the area. You can also opt to rent an RV and camp along the way.

Hamilton Pool Preserve
The Hamilton Pool Reserve is a 45 minute drive fom Austin. The best option is to drive your own car