How high can the mig 29 fly?

Mikoyan quotes a service ceiling of 18,000 m (59,000 ft) for the MiG-29, with the MiG-29K and MiG-35 in the 17,500 m range. Service ceiling is the altitude at which the aircraft can still climb at a defined minimum rate, usually 0.5 m/s (100 ft/min); above it the jet can be zoom-climbed briefly but cannot hold the height. The figure assumes a clean aircraft, full afterburner and a supersonic climb profile that converts speed into altitude. Two RD-33 engines of 81.4 kN (18,300 lbf) each in afterburner and a wing loading lower than the F-16's are what make the number possible.

At 18,000 m the air is a small fraction of sea-level density, the wings generate little lift and the engines are close to their surge margin, so a fighter there is fast but cannot manoeuvre. Operational sorties are flown far lower: interceptions of high-flying bombers or reconnaissance aircraft at 12,000 to 15,000 m, air combat between 3,000 and 10,000 m, ground attack often below 1,000 m. A loaded MiG-29 with a drop tank and six missiles will not reach the book ceiling; drag and weight take several thousand metres off it. Pilots wear a pressure suit or a pressure-breathing mask for flights above about 12,000 m in case the cabin loses pressure.

The F-15 Eagle is credited with about 20,000 m (65,000 ft), the Su-27 with 18,500 m, the F-16 with 15,000 m and the Rafale with 15,240 m; the specialised MiG-25 and MiG-31 interceptors exceed 20,000 m. The MiG-29 therefore sits near the top of its class, thanks to the thrust-to-weight ratio above one that also gives it a climb rate of around 330 m/s (65,000 ft/min). That performance suited a fighter meant to scramble, climb and intercept quickly over the battlefield rather than loiter for long periods.