I am in the Avianca lounge now which is downstairs near gate 12. It shows it is a star alliance Gold lounge. When checking in for flight in J, was not told of the lounge but when I asked was directed here, but the agents were harried with lots of people with cancelled connections in IAH due to the snowstorm on the East Coast.

The Avianca lounge is small but has wine and spirits out and there are paninis and a press fruit salad sweets etc. No hot food now at 930 pm but there are spots for food tray warmers.
I don't think there are any Star late flights after the Air Canada flight leaves so I'm guessing the 25 or so people in here are all on the SCL-IAH.

Some information for folks transiting from a domestic flight to the sole daily United flight departure at 11 pm, check in does not start until around 745pm and United occupies the counters 90-95 that are at the far end away from the other US carriers right next to the entrance to the domestic pier. If you arrive on another flight early you can't check in until three hours before departure timeand therefore can't get to the lounge until then. I arrived from a LAN domestic flight and had to kill three hours here before checking in. There are restaurants in the terminal and the Holiday Inn is just across the way - a two minute walk if you would prefer their hotel restaurant, which is pretty nice having stayed there.