I tried it out in early June before catching a flight. It's nice and the pricetag isn't too bad (1500yen). There's a couple of indoor pools as well as a scrubdown area, a mist sauna and some nice outdoor pools.

The view you have from the men's side of the outdoor pools is towards the north, so it isn't quite as good for airplane spotting as the onsen at Nagoya-Centrair, but you do have an OK enough view of planes coming in for a landing and the military side of the airport.

There were some common areas and food available but time was short for me and I concentrated on the dipping.

Definitely worth it if you ask me. Of course if you're coming from a fancier mountain spot, this will probably seem like a step down, but if you need to freshen up and relax before a long trip, this is your best bet.