Tripadvisor lists the Jackson, Wyoming, airport as the one for Lava Hot Springs. This is incorrect. There are at least 3 airports that would be far better. The nearest commercial airport is Pocatello, ID, but there are a limited number of flights to it. Idaho Falls is a bit further away, but has more flights. Both being regional airports are expensive. The closest major airport is Salt Lake City. You can fly there and rent a car for what it would cost to fly to Jackson, Pocatello, or Idaho Falls. From SLC it is an easy 2 1/2 hour drive to Lava and there are a number of nice stops along the way. Jackson is as far away, it is a tougher drive, and it costs more. Fly to Jackson if you want to go to Jackson or Grand Terton NP, otherwise avoid it.