The drive from Lee's Summit to Phoenix, Arizona, is approximately 2,000 kilometers and takes about 20 hours via I-70 W and I-40 W. This route takes you through Kansas, Colorado, New Mexico, and Arizona. It is a long but straightforward highway drive. Be prepared for changing weather conditions, especially in the mountains.
Total Distance: 2,000 km driving, 1,800 km straight-line.
I-40 can be very busy near Phoenix; plan your arrival accordingly.
Winter or Spring for comfortable outdoor sightseeing.