Power Girl can fly with Monstrous ability, or at about 450 m.p.h.
The Justice Society of America * Andrew Vinson
Kara was the only child of Zor-L, an expert in sciences of the mind on Krypton. When Zor-L's brother, Jor-L, predicted the destruction of Krypton, Zor-L followed his advice and constructed a space-ship to save his family. Working under terrible time pressure in a field that was new to him, Zor-L was only able to build a ship to carry his daughter. As they watched Kara leave for the stars, Zor-L and Allura perished in the explosion of Krypton.
While Jor-L's son, Kal-L, sped directly to Earth, the ship carrying Kara went on a less direct route. Conserving fuel, and concentrating on the mental development of Kara, the so-called symbio-ship kept her alive, aging very slowly, and crafted an artificial reality around her. Kara grew up in this dreamworld, aging only 20 years during a 60-year journey.
Upon arrival on Earth, Kara's ship was met by Superman, who helped his cousin to adjust to human society and to Earth. Shortly thereafter, Kara joined the Justice Society of America as Power Girl, and became a close friend of the Huntress.
With the assistance of the Huntress, and of Gotham Globe reporter Andrew Vinson, Power Girl adopted the secret identity of Karen Starr, a software designer for Ultimate Computer Corporation.