Japan Accessible Tourism Center

Accès à l’aéroport en fauteuil roulant.
Kansai international airport official website  Airport Access Information 

Train JR  " Haruka " Very fast, but costs high. Full wheelchair accessible train and stations.
to Kyoto, 70 min, 1,830 yen + 1,660 yen ( express fee ) = 3,490 yen
to Shin Osaka, 50 min. 1,320 yen + 1,460 yen ( express fee ) = 2,780 yen
JR  Local Express Many local express train "Airport Rapid Service ". No reserved seat.
Major JR stations are wheelchair accessible.
to Osaka, 65 min, 1,160 yen. to Tennoji, 45 min, 1,030 yen.    

Nankai  Rapit Limited Express, every 30min between airport and Namba. All reserved seats.
to Namba, 35 min, 890 yen + 500 yen = 1,490 yen. Not so high price. 
Wheelchair space inside train and accessible stations.
Nankai  Airport Express Local train. Many stop, but not so slow. No reserved seat. 
to Namba, 50 min, 890 yen. Crowded among rush hour. 

Bus Kansai Airport limousine So many destination. No non-step bus. Stairs on door. 
Difficult to use for wheelchair users. Trains is better.

Taxi airport taxi So far to city center. It costs too much. If you are rich, no problem.

to / from  Itami airport Bus is very popular, but difficult to use bus for wheelchair users.
By train, JR to Osaka, Hankyu to Hotarugaike, Monorail to Itami airport.

to / from  Kobe airport Ship service " Kobe - Kanku  Bay Shuttle " between two airport every one hour.
1,500 yen. Non step bus to port. Non step to ship. Wheelchair space inside ship.

    West Japan Railway company  English website
    route map ( PDF ) only Japanese, JR West