Asked about the stormy weather conditions that also delayed his match, he said: "It was brutal. The ball was moving, stopping, there were chairs flying. They were some of the hardest conditions I've ever played in and I come from Scotland, so that's saying something."
It will be the 25-year-old's second consecutive grand slam final after his Wimbledon loss to Roger Federer, and his first US Open final since 2008 when he also lost to Federer.
After his semi-final victory, First Minister Alex Salmond offered his congratulations.
"The whole of Scotland will be right behind Andy in his next match," he said. "He is already an Olympic gold medallist, and he has what it takes to become a grand slam champion and cement his place as a Scottish sporting legend."