Jason Kelce's trip to Los Angeles is going a helluva lot better than his most recent one to Happy Valley ... he was spotted out in the City of Angels on Sunday celebrating the Eagles' win -- and didn't appear to have one single issue with fans.
The former Philadelphia offensive lineman was seen at a couple watering holes on the westside of L.A. ... helping bartenders pass out drinks while also cheering on his ex-team as it blasted the Cowboys in Dallas.