FLDAS Data Download at the NASA GES DISC: 

https://disc.sci.gsfc.nasa.gov/datasets?keywords=FLDAS

FLDAS data is also available via https: 
https://hydro1.gesdisc.eosdis.nasa.gov/data/FLDAS/

The data is available via NASA's GES DISC data center Hydrology site (on the HDISC page).

* Access to GES DISC data will require all users to be registered with the Earthdata Login system.