The optimal public transportation option from Kyoto to Osaka Kansai Airport is as follows:

  1. Take the JR Kyoto Line or JR Sanyo Shinkansen to Kyoto Station.
  2. Transfer to the JR Kansai Airport Line at Kyoto Station and go directly to Kansai Airport.

Here are the specific steps:

  • From Kyoto, take the Kyoto Municipal Subway Karasuma Line or JR Kyoto Line directly to Kyoto Station.
  • After arriving at Kyoto Station, purchase a JR Kansai Airport Line ticket to Kansai Airport. The Kansai Airport Line is a limited express train that goes directly to Kansai Airport. The ride time is approximately 40 minutes.
  • After getting on the train, find a seat and sit down. The train will arrive directly at Kansai Airport Station.

This option is faster and more convenient, and there is no need to transfer to other means of transportation.