Google maps before to plan a route and waze for navigation. Always, always, always verify and check out the routes ahead of time from google or waze. Always look over the directions and map ahead of time before just taking off following the directions. A lot of them do shortest distance or time that may lead you through some weird places or away from populated areas that may have food, gas, etc. check the with noaa also for flood warnings and possible closures or delays due to weather. I always tell it to route before I ever leave and go through the entire route to look it over and where it is taking me. I may end up taking a slightly different route to avoid areas or stay near certain areas at different times. Always have people tell me they just punch in the destination and follow blindly and end up in weird areas or having to go through areas they didn’t want to.
The route up to st jo looks pretty good and then going up through Kansas up through Nebraska. Using 36 and 75. It’s not too much out of the way. However like ezsoil said probably slow with speed traps depending the times you hit it. Interstates you can fly pretty fast.
We did through north Arkansas up through Springfield on the way last year and it was slow through part of the winding portion. Kansas City to Omaha was the easier part. Way back seemed faster going interstate because we could maintain speed however gets older faster because you don’t have many turns and just gets monotonous for that long on the interstate. If you have time take the highways and explore the country a little besides what you see on the interstate.
The flooding is really bad and has been for a while. Also be aware of hotels near flooding may still be booked from those displayed from flooding or emergency crews in the area.