DIRECT TO PROCEED TO CART PAGE OR CHECKOUT PAGE
---------------------------------------

/*direct go to view cart page*/
add_filter( 'woocommerce_add_to_cart_redirect', 'redirect_to_cart' );
function redirect_to_cart() {
   return wc_get_cart_url();
}

------OR---


/*direct go to Checkout page */
add_filter( 'woocommerce_add_to_cart_redirect', 'redirect_to_checkout' );
function redirect_to_checkout() {
    return wc_get_checkout_url();
}