It marked the second Olympic curling medal in United States history, following a bronze at the 2006 Turin winter games.
Ledecka is the first female Olympian to win two gold medals in two separate events in the same Winter Olympics [VIDEO].
After speeding to first in the parallel giant slalom, Ledecka said it was "fantastic" to win gold.
Ledecka revealed that it felt unusual to go back-and-forth between the snowboard and skis.
Ester Ledecka of the Czech Republic competes.
Asked which of her medals gave her the greatest satisfaction the 22-year-old Ledecka said, without the slightest hesitation: "The best satisfaction is really that I could be here on both and win both".
Skiing and snowboarding are very different pursuits, requiring different skills, different senses of balance, but she saw a fundamental similarity. "Is this a kind of mistake?" she said after winning the super-G final last Sunday.
"But it is a great thing that I could be here in both sports and enjoy a career in both sports", she said.
With Saturday's win, Ledecka joins Thorleif Haug and Johan Groettumsbraten as the only athletes to achieve a multi-sport double at the Winter Games. And after progressing through the rounds without undue trouble, she comfortably beat the German Selina Joerg by more than half a second in the final.
Ester Ledecka kept them strapped on, concealing her eyes, as she sat down to answer questions at a news conference.
"On the other hand, snowboarding helps me a lot in skiing because I just have one edge, just one chance". During her super-G run, Ledecka was shocked at her end time and expected it to change but it did not. But she had different plans this time.
"For somebody, anybody, to take ski racing to another level, it takes a ton of hard work, focus, determination, an incredible amount of athleticism, " said Mikaela Shiffrin, the US Alpine skier who won two medals at the Games.
"I know the pressure after her unexpected gold was really heavy on her, but rather than let the gold pull her down she put it under her feet and jumped higher, so congratulations to Ester", said Reiter.
Jessie Diggins has one more big Olympic moment awaiting her. Diggins - who thrust herself across the finish line to give the Americans a dazzling gold medal in the cross-country team sprint - has been selected as the USA flagbearer for Sunday night's closing ceremony at the Pyeongchang Games.