F-35 vs Su-57, a Fleet Against a Promise

F-35 versus Su-57 is the fifth-generation matchup that exists mostly on paper, because one side has built over a thousand jets and the other about forty. Still, the comparison matters: it defines Russia’s export pitch, shapes Indian and Algerian choices, and tests what ‘stealth fighter’ actually means when production, sensors and software, not airshow maneuvers, decide air wars.

1,100+

F-35s delivered worldwide

~44

Su-57s built including test aircraft (2026)

0.005 m²

Class of F-35 frontal RCS, per open estimates

0.1-0.5 m²

Open-source estimates of Su-57 RCS

Two different fifth generations

The F-35 was conceived as a networked sensor-striker built in industrial mass: one design, three variants, allied production and a software pipeline treated as the real weapon. The Su-57 is a different animal, an agile, twin-engine air-superiority frame with stealth applied as one trait among several, supermaneuverability and big internal fuel prioritized where Lockheed prioritized signature and fusion. Judged by its own doctrine each is coherent; judged as programs, one is a fleet and the other remains a development squadron.

F-35 vs Su-57 comparison table

Head to head

Parameter	F-35A	Su-57
First flight / service	2006 / 2015-16	2010 / December 2020
Built	1,100+ across variants	About 44 including ~10 test jets (2026)
Engines	One F135, 191 kN class	Two AL-41F1, 142 kN each; Izdeliye 30/AL-51 still in development
Open RCS estimates	~0.005 m² class frontal	~0.1-0.5 m² per airshow-era assessments
Radar	APG-81 AESA plus DAS/EOTS fusion	N036 Byelka AESA suite plus 101KS IRST complex
Weapons carriage	Internal bays, expanding external options	Tandem internal bays, R-77M and Kh-series
Combat use	Israeli, US and allied strike operations	Standoff launches and claimed missions over Ukraine, limited and contested
Unit cost	About $80-110M by variant	Undisclosed; export offers reportedly well below Western peers

Figures from public program data and open-source estimates; Russian performance figures are largely manufacturer claims.

Stealth, the measurable gap

Stealth is where the designs diverge most visibly. The F-35’s shaping, serpentine inlets and coating regime target the fraction-of-a-birds RCS class open literature assigns it. The Su-57’s blended shape reduces signature dramatically against an Su-27, but visible rivets, panel gaps and an uncured engine installation, documented bluntly by observers at Zhuhai 2024, leave open estimates orders of magnitude higher, closer to a clean fourth-generation jet head-on than to an F-22. Russian sources claim 0.1-1 m²; even accepting the claim concedes the tier difference. What stealth buys, first look and first shot, thus accrues to the American jet in any meeting engagement either air force models.

Sensors and the software war

The Su-57’s sensor suite is genuinely ambitious, an N036 radar family distributed around the airframe plus the 101KS electro-optic complex, including IRST, that Russian doctrine has always loved. The F-35’s edge is integration: DAS staring coverage, EOTS, electronic warfare and radar fused into one picture and exported over Link 16 and MADL to a package of wingmen, ships and forthcoming drone teammates. Two decades of block upgrades, TR-3 and Block 4 in progress, treat the jet as a software platform; the Su-57’s equivalent pipeline is constrained by the same sanctions and budget that cap its airframe count.

Combat records compared

F-35s have flown strike and defense-suppression missions with multiple air forces, including extensive Israeli employment and US operations across the Middle East, with the type’s first air-to-air kills logged against drones and cruise missiles; the record is real if asymmetric. The Su-57’s war has been cautious: standoff missile launches from Russian airspace against Ukraine, claimed SEAD sorties without independent verification, two airframes damaged by Ukrainian long-range drones at Akhtubinsk in 2024, and one bizarre footnote, a Su-57 destroying its own Okhotnik drone gone rogue. Neither jet has met a peer fighter; only one has been risked like a strategic asset rather than employed like a fleet.

Exports and what buyers choose

The F-35 sells alliance membership as much as aircraft, twenty operators and counting, waitlists into the 2030s, with the political strings that implies. The Su-57E’s pitch is the opposite: no end-use lectures, industrial offsets, and a price reportedly far below Western tags, aimed at buyers sanctioned out of or politically allergic to the F-35. Algeria’s reported 2025-26 deliveries would make it the first export customer; India, having exited the joint program in 2018, keeps circling with indigenous ambitions as its real answer. The export scoreboard, like the production one, is not close, and it is the fairest single metric the rivalry offers.

The verdict

As a weapon available in numbers, networked, updated and combat-employed, the F-35 wins this comparison in every operationally meaningful column: signature, fusion, fleet size, sustainment and record. The Su-57 is neither hoax nor peer; it is a capable airframe trapped in a program too small to matter yet, whose kinematic virtues and IRST-heavy doctrine would count only in the merged fights its own air force avoids. Until AL-51 engines, series production and honest combat employment arrive, the matchup remains what it is today: a fleet versus a promise.