I don't think you can without root. But I don't have Flipboard installed as bloatware. Stock rom. Had 4.1.2, not 4.3 . I installed it once from Google Play, but didn't like it, and I removed it.
without root you can't remove it, but you can freeze it
go to settings > more > application manager > all
scroll down and find Flipboard app > click and select Disable