I want to change my apple Id from Us To Saudi Arabia And I have balance on my account.

Buy something more expensive and pay the balance with a credit card or contact iTunes Support and ask them to zero balance your account. See the Apple Support articles below for contact information.   

iTunes Support – world wide 

Apple Support schedule phone call     

Billings and Subscriptions 

If necessary, try Twitter

https://twitter.com/AppleSupport.          People have posted it may take an hour or more to get a response.