What has more radiation a chest xray or a flight?

A chest X-ray typically exposes a person to about 0.1 to 0.2 millisieverts (mSv) of radiation, while a flight, particularly at high altitudes, can expose a passenger to approximately 0.03 to 0.05 mSv per hour. Therefore, a single chest X-ray generally has more radiation than the radiation exposure from a short flight. However, the cumulative exposure from multiple flights can add up, depending on the duration and altitude.