Hello there Sally-Ann!
October is one of my favorite months to visit Walt Disney World! The weather is fantastic! Epcot has the International Food and Wine Festival and Magic Kingdom has one of the best events of the year, Mickey's not so Scary Halloween Party!
I was able to talk to one of the Cast Members about your questions. They gave me the days of the week that each one of the tours are offered and also mentioned that just like dining reservations, tours can be reserved at 180 days out.
The Keys to the Kingdom (KTTK) tour is offered everyday of the week.
The Magic Behind Our Steam Trains tour is offered Monday through Saturday
The UnDISCOVERed Future World tour is offered on Monday, Wednesday, and Friday.
When you are ready to make your reservations, the number to call is 407-WDW-TOUR
The very informative cast member did say that these days can change without notice and the calendar for October has not been released just yet but she did add that the days typically do not change. Thanks so much for asking the Moms Panel and if you have additional questions just let us know! We are always here to help!