I'd like to try Onsen near Osaka?

Arima is one of the oldest onsen in Japan, It is about 1 hour drive from central Osaka. There is a daily bus commuting between Osaka and Arima. For details, visit

http://bus.hankyu.co.jp/kinki/arima_h.html

(They only have Japanese pages of timetable and tariff )

If you go to the airport next day, take the same bus back to Osaka and catch a train or bus to KIX. It will take about 3 hours from Arima to KIX, so If your flight departs in the morning, I recommend NOT to stay in Arima.

For more information about Arima and Ryokans, visit here.

http://www.arima-onsen.com/eng/index.html

Enjoy your stay in Japan!

There are not a lot onsen in Osaka.

But you can try to find it from this side.

http://www.osakafu.org/onsen.html

Osaka is Minoh Onsen http://www.minoo-onsen.co.jp/english/ An onsen near Kyoto is Kurama Onsen, Ryokan with indoor spa and for day visitors outdoor bath

Good luck

I take it you will be arriving in Kansai Airport. At this airport there is a great Kansai Information desk - they will be able to answer all your questions and point you in the right direction. Also the same place has a load of English brochures around, flick through, I am sure you will find something.