Fill a pot with lightly salted water and bring to a rolling boil. Stir in the pasta and return to a boil. Cook pasta until tender yet firm to the bite, rinse with cold water and drain well.
Combine pasta, tomatoes, onion, cucumber, olives, and feta cheese in a large bowl. Pour the vinegar, olive oil, oregano, lemon, salt and pepper, over the pasta mixture and mix well. Cover and chill for 2 hours before serving.