Exchange students are not charged UD tuition or university fees.  They are, however, responsible for other costs.  You should expect each semester to roughly cost $2,200 - $3,000, which includes the following estimates (as of Spring 2017):

Meals/Food: $250 - $500  (As part of your exchange you will receive $500 towards a Neighborhood flex meal plan.  However, you may want to add more money to the account as the semester progresses depending on your eating habits.)
 
Books:  $300 - $450 (this will vary according to each student's schedule of courses)

Health Insurance:  $150 - $300 (you may select any plan that covers health costs while at UD)

Spending money/Miscellaneous:  $1,500