Quite simply, flipping a kayak is more difficult than you might think. Most models are designed to be extremely stable.
It's also hard to believe, there may be some occasions where you want to flip a kayak on purpose. In fact, many expert paddlers suggest learning how to flip a kayak because it increases confidence in the water, especially in challenging conditions such as the open ocean.
Learning how to flip a righted kayak is best done with help from a professional instructor. Chances are, you'll learn two different types of rolls. One is called the sweep (or screw) roll, and one is called a vertical (or C to C) roll. Though they are slightly different, both types of rolls end in the same result when performed successfully: You, sitting upright in your kayak, paddling onward — albeit a bit wetter than when you started.