Korea Aerospace Industries (KAI) KF-21 Boramae vs Sukhoi Su-57
Full specs: Korea Aerospace Industries (KAI) KF-21 Boramae Sukhoi Su-57
Korea Aerospace Industries (KAI) KF-21 Boramae and Sukhoi Su-57 are both fighter aircraft, compared here on public specifications. The Sukhoi Su-57 leads on weapons payload (10,000 vs 7,700 kg). Several Russia-origin figures here are manufacturer or state claims with limited independent verification, so treat this comparison as directional.
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Full data
Full spec sheet
| Performance | ||
| Max speed (km/h) | 2,200 km/h | 2,440 km/h ✓ |
| Max speed (Mach) (Mach) | 1.81 Mach | 2 Mach ✓ |
| Range (km) | 2,900 km | 3,500 km ✓ |
| Combat radius (km) | 700 km | 1,500 km ✓ |
| Service ceiling (m) | 16,700 m | 20,000 m ✓ |
| Thrust-to-weight | 1 | 1.08 ✓ |
| Firepower | ||
| Hardpoints | 10 | 10 |
| Weapons payload (kg) | 7,700 kg | 10,000 kg ✓ |
| Physical | ||
| Length (m) | 16.9 m | 20.1 m |
| Empty weight (kg) | 11,700 kg | 18,500 kg |
| Combat weight (kg) | 25,600 kg | 35,000 kg |
| Crew | 1 | 1 |
| Propulsion | ||
| Thrust (kN) | 98 kN | 147 kN ✓ |
| Program | ||
| Unit cost (USD) | $65,000,000 | $50,000,000 ✓ |
| Units built | 20 | 30 ✓ |
| Operator countries | 2 ✓ | 1 |
Frequently asked questions
Which is faster, Korea Aerospace Industries (KAI) KF-21 Boramae and Sukhoi Su-57? +
The Sukhoi Su-57 is the fastest of the 2 compared here, at 2,440 km/h.
Which has the longer range? +
The Sukhoi Su-57 has the longest range at 3,500 km.
Which carries the larger weapons payload? +
The Sukhoi Su-57 carries the largest weapons payload at 10,000 kg.
Which is cheaper? +
The Sukhoi Su-57 has the lower public unit-cost figure at 50,000,000 USD. Treat this as directional, defense pricing varies by contract and configuration.
Which has the higher max speed (mach)? +
The Sukhoi Su-57 has the higher max speed (mach) at 2 Mach.
Which has the higher combat radius? +
The Sukhoi Su-57 has the higher combat radius at 1,500 km.
Is the Korea Aerospace Industries (KAI) KF-21 Boramae better than the Sukhoi Su-57? +
On the public specs we track, the Sukhoi Su-57 leads on 6 of 6 headline metrics, see the full spec sheet for the metric-by-metric breakdown.
Where does this comparison data come from? +
Every figure in the table is sourced from public manufacturer pages, defense-ministry releases and reference publications, and is verifiable on each system's spec page. WeaponSpecs does not accept vendor placement.
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