Kauai is a Hawaiian island in the central Pacific Ocean (~2,400 mi from California). Lees Summit is a city in Missouri, USA (Kansas City metro). They are separated by ~4,000 miles of ocean + continent — no roads, no direct ferries.
The "distance" is only definable as great-circle air distance (~4,100 mi / 6,600 km) or flight time. Driving distance is undefined.
Note: "Less Summit" in the query is likely a typo for Lees Summit, MO.