There are numerous benefits of including Jquery/ Jquery UI from CDN, like they will  reduce your bandwidth use, easy to include and use that is no complex configurations just include just two, three javascript and css files and you are ready to go.

As far as Jquery is concern, you can find links for including Jquery and Jquery UI on official Jquery website on the footer also Google and Microsoft on their CDN.  You will find both links for javascript files and css files. Some of the links are given below:

Jquery.com

<script src="http://code.jquery.com/jquery-1.9.1.js"></script>

<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>

<link rel=”stylesheet” type=”text/css” href=”http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css”>

Format: http://code.jquery.com/ui/<version>/themes/<theme name>/jquery-ui.css

Google:

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>

<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.min.js"></script>

<link rel=”stylesheet” type=”text/css” href=”http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/themes/smoothness/jquery-ui.css”>

You will find more and recent one on Google Site

Microsoft:

<script src="http://ajax.aspnetcdn.com/ajax/jquery/jquery-1.9.0.min.js"></script>

<script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.10.3/jquery-ui.js"></script>

More Links Microsoft site and Here

–Include Jquery, Jquery UI from CDN–