If you want to make your CKEditor table responsive you need to set the table width in percentage rather then a fixed px or em value. By default, the table width value is set to 500 px. To change this value you need to add the following code in config.xml file.
/**
* @license Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md or http://ckeditor.com/license
*/
CKEDITOR.on('dialogDefinition', function( ev ) {
var diagName = ev.data.name;
var diagDefn = ev.data.definition;
if(diagName === 'table') {
var infoTab = diagDefn.getContents('info');
var width = infoTab.get('txtWidth');
width['default'] = "100%";
}
});
The above code will set the Table's default width to 100% instead of 500 as previously set.

Change CKEditor default width.png
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