What is an estimate of how much it would cost for a plane ride?

Me and my family are going to Disneyland in Orlando Florida..We live in Tennessee.And we don't know how we should get there...Are options are either;pulling our camper all the way there,taking our RV there,or a plane ride...It would be around $800 on the way there for taking the camper or RV..But how much would it cost for a plane ride?We have 9 people..3 kids under the age of 6,4 teens(18,16,15,and 13),and two adults..What would be a good estimate of how much plane tickets would cost just to get there(not including the way back).