Southern Kings edged Jaguares 31-30 for their fifth win of the Super Rugby season.
The Kings' last visit to Buenos Aires ended in an embarrassing 73-27 defeat in May last year, but there was no repeat of that on Friday.
Jaguares led 20-14 at half-time, however, the Kings proved too hot to handle for the wasteful hosts.
Makazole Mapimpi scored two tries for the travelling Kings at Velez Sarsfield. Luzuko Vulindlu and Wandile Mjekevu also crossed over, while Lionel Cronje kicked 11 points.
Jaguares posted five tries via Joaquin Tuculet's double and Juan Manuel Leguizamon, Emiliano Boffelli and Nicolas Sanchez but their goal-kicking percentage was just 25.
The Kings remain bottom of the Africa 2 Conference, two points adrift of Jaguares.