Bring a large pot of lightly salted water to a boil. Add pasta and spinach and cook for 8 to 10 minutes or until pasta is al dente; drain and reserve.
Heat oil in a large frypan over medium heat. Add garlic and chilli flakes; saute for 5 minutes or until the garlic turns light gold. Add cooked pasta and spinach to the frypan and mix well. Season with salt and toss; serve.