The squadron was formed as the third of the JASDF's McDonnell Douglas F-4EJ Phantom II squadrons. It replaced the 4th Squadron, which had been equipped with North American F-86F Sabres, and was formed using some of the personnel from the 4th squadron. At the time the JASDF's squadron numbering system was dependent on the aircraft model used. There was a gap between the disbanding of the 4th and the founding of the 303rd due to discussions with the local community near the base about the F-4s being based there.[2]
On December 1, 1987, the squadron re-equipped with F-15J/DJ aircraft. It was the first F-4 squadron to re-equip with the F-15. Unlike many JASDF fighter squadrons, it has been located at the same base for its entire existence.[1][2]
On 22 November 1995 F-15J 02-8919 flown by Lieutenant Tatsumi Higuchi was shot down by an AIM-9L Sidewinder missile accidentally fired by his wingman during air-intercept training over the Sea of Japan. The pilot ejected safely.[4][5]
In July 2018 aircraft of the squadron trained in Japanese airspace with US B-52 bombers.[9][10]
Tail markings
Originally the squadron's tail marking was of the 6th Air Wing's red, white and blue marking. In 1981 the tail marking changed to be that of a dragon inside a stylized "6". The squadron's call sign is "dragon", and in addition the dragon depicted in the tail marking is said to be the protector of Mount Haku, which is not far from the base.[2]