Deadlier than Tejas, cheaper than F-35: What South Korea’s KF-21 Boramae brings to the skies

South Korea’s KF-21 Boramae on static display during DX Korea 2023 in Seoul.

South Korea’s KF-21 Boramae fighter, set for service this year, marks a major defense milestone, showcasing Seoul’s growing military and industrial power. The jet offers advanced features, export potential, and signals reduced reliance on foreign suppliers.

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South Korea is set to join a small and exclusive group of nations capable of designing and producing advanced combat aircraft, as the indigenous KF-21 Boramae moves closer to operational service later this year. The programme represents one of the most ambitious defence projects in the country’s history and signals Seoul’s growing confidence as a military and industrial power.

Developed by Korea Aerospace Industries, the twin-engine multirole fighter has been in development since 2010 and is intended to replace the Republic of Korea Air Force’s ageing F-4 and F-5 fleets. Officials say the aircraft has already logged more than 2,000 hours of test flights, clearing key performance and safety benchmarks ahead of initial induction.

Often described as a 4.5-generation fighter, the KF-21 sits between legacy fourth-generation jets and full stealth platforms. It is equipped with modern avionics such as an Active Electronically Scanned Array radar, fly-by-wire flight controls, advanced sensors, and reduced radar signature features. While the current version carries weapons externally, future upgrades are planned to introduce internal weapon bays to further enhance survivability.

With a reported top speed of around 2,300 kilometres per hour, the Boramae is positioned as a cost-effective alternative to fifth-generation fighters like the F-35, offering advanced capabilities without the price tag and export restrictions associated with top-tier stealth aircraft.

The programme is jointly funded with Indonesia, which is expected to induct its own variant, while interest has reportedly been shown by the Philippines and Malaysia. This growing attention comes as South Korea’s defence industry expands its global presence, buoyed by strong exports of platforms such as the K2 main battle tank and the K9 self-propelled howitzer.

Analysts view the KF-21 as a significant milestone in Asia’s increasingly crowded fighter aircraft landscape. Other countries are also pursuing indigenous programmes, including Tejas developed by India and Turkey’s KAAN. In contrast, China’s J-20 remains the region’s most advanced operational stealth jet, though many details of its capabilities remain undisclosed.

For South Korea, the KF-21 is more than a new fighter aircraft. It is a statement of technological maturity and strategic intent, underscoring Seoul’s determination to reduce dependence on foreign suppliers while strengthening its ability to respond independently to evolving security challenges in East Asia.