Junior Seau's private memorial -- attended by close friends, family, and former teammates -- is now over ... and the NFL legend's casket is currently en route to a San Diego cemetery for burial.

As we reported, the burial is scheduled for 1pm. A public memorial will take place later tonight at 6:30pm at Qualcomm Stadium, home of the Chargers.

TMZ broke the story ... Junior was found dead in his California home on May 2nd after shooting himself in the chest.