.htaccess redirect for a specific folder files from non-www to www

The website travoline.com is hosted in wordpress - which has a .htaccess file which redirects non-www to www. Whereas I have few inside pages which is created in .html in a separate folder outside wordpress i.e. http://ift.tt/1zm6Ldy - How do I redirect the above html url from non-www to www (Rewrite Engine on). Where should I add .htacess to use this redirection. (should I add it in the hotels folder or in the intl folder.)