how much will it cost extra to upgrade the room to king size non smoking?
As far as I know there is no up-charge for a King. Becareful because the King Size have pay options that do cost more IE Flexible, Advance charge etc..
Enjoy your stay.
I'm not too sure either.
I am not sure if there is an up charge, and if there is I doubt it would be more than ten dollars. The staff is so accommodating that I would urge you to call them direct and see what happens.
Get an answer from Four Points by Sheraton Fairview Heights staff and past guests.