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To improve your circulation after a long flight, it is important to take a nice walk. You will likely have to walk to pick up your luggage, which will help a little bit. In addition, you could take a walk outside when you get to your destination. If you feel pain or swelling in either of your feet or legs, you should seek immediate medical attention. If there is some minor puffiness in your ankles or legs but no pain or any other unusual symptoms, you don't need to worry. Slight puffiness is not due to blood clotting and is normal with long flights. A pulmonary embolism occurs when a blood clot blocks an artery in your lungs. This blood clot often originates in a person's legs and travels to their lungs. You should seek immediate medical attention if you experience any of the symptoms of a pulmonary embolism such as chest pain or shortness of breath. Likewise, see a doctor if you feel dizzy, start coughing up blood or have difficulty breathing. Pulmonary embolism can be a fatal complication of blood clots.
Go for a walk right after the trip. Seek medical attention for deep vein thrombosis. See a doctor if you experience symptoms of a pulmonary embolism.