Do you have a JR pass? Look up at hyperdia.com to have a rough idea esp the timing of your journey
One way fare from O to K is 400-500yen.
Keep in mind that the price quoted by Hiromi refers to ordinary trains, not to the Shinkansen ones (for which, among other things, as Hyperdia show, you need to change in Shin-Osaka station). On a so short route, the Shinkansen aren't advantageous either in terms of time: by ordinary train the journey time is approximately 30 minutes
¥ 540 - 31 minutes via JR Special Rapit train.
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