After developing the J35D Draken variant, the Swedes created another variant: the J35F. This new version featured an advanced Mod.67 afterburner and the ability to fire AIM-4 and AIM-26 missiles. It also had a new SAAB S7B fire control system and an IRST from Hughes. Additionally, the pilot’s cockpit visibility was improved, and new instruments and an autopilot were installed. One of the 30-mm cannons was removed and replaced with additional electronics. The first production aircraft entered service in mid-1965, and a total of 208 were built for the Swedish Air Force.

As the Draken became obsolete, a replacement was needed, though none was expected in the near future. Therefore, in 1985, a modernization program began to upgrade the fighters to the J35J standard. This primarily involved installing a new datalink, increasing the cannon’s ammunition capacity, and adding two hardpoints for air-to-air missiles. All of the aircraft served with the Swedish Air Force until 1999, when they were retired.

The J35J was introduced in Update 2.59 "Sky Odyssey". In combat, it is very similar to the Saab J35XS, differing only in its lack of countermeasures. The aircraft stands out for its high maneuverability and top speed. However, it loses energy quickly during maneuvers and its cannon is mediocre.