For our customization want to get woocommerce logout page url programmatically then place the following snippet!. Here $logout_url having your woocommerce logout url.
$myaccount_page_id = get_option( 'woocommerce_myaccount_page_id' );
if ( $myaccount_page_id ) {
$logout_url = wp_logout_url( get_permalink( $myaccount_page_id ) );
if ( get_option( 'woocommerce_force_ssl_checkout' ) == 'yes' )
$logout_url = str_replace( 'http:', 'https:', $logout_url );
}
Have any doubt, then comment here!