B-21 vs B-2: How America’s Two Stealth Bombers Compare
B-21 vs B-2 compared: stealth, range, payload, crew, cost and fleet size of the Raider and the Spirit, from Air Force fact sheets.
Short answer: In the B-21 vs B-2 comparison, both are Northrop Grumman flying-wing stealth bombers that can carry nuclear and conventional weapons, but the B-2 Spirit is a 1990s design with a fleet of 20, while the B-21 Raider is its successor, planned at a minimum of 100 aircraft. The Air Force lists the B-2’s unit cost at about $1.157 billion in fiscal 1998 dollars. It puts the B-21’s average procurement unit cost at $692 million in 2022 dollars. The B-21 is also designed for “manned or unmanned operations” and an open systems architecture that allows upgrades.
Last updated: October 27, 2026
B-21 vs B-2: the core difference
The two bombers look alike because they share a basic idea: a tailless flying wing that is hard to see on radar. The difference is generation and numbers.
The Air Force B-2 fact sheet calls the Spirit “a multi-role bomber capable of delivering both conventional and nuclear munitions” that can strike “anywhere on the globe through previously impenetrable defenses.” It flew first on July 17, 1989.
The Air Force B-21 fact sheet calls the Raider a “dual-capable penetrating strike stealth bomber” that “will form the backbone of the future Air Force bomber force consisting of B-21s and B-52s.” The name honors the Doolittle Raiders of World War II, and the designation marks it as “the first bomber of the 21st century.”
Specs side by side
The B-2 sheet is current as of May 2026. The B-21 sheet publishes far fewer figures, because most of the program remains classified.
| Feature | B-2 Spirit | B-21 Raider |
|---|---|---|
| Primary function | Multi-role heavy bomber | Nuclear-capable, penetrating strike stealth bomber |
| Prime contractor | Northrop Grumman | Northrop Grumman |
| Engines | Four GE F118-GE-100, 17,300 lb thrust each | Not published (Pratt & Whitney is a program partner) |
| Wingspan / length | 172 ft / 69 ft | Not published |
| Max takeoff weight | 336,500 lb | Not published |
| Payload | 60,000 lb | Not published |
| Unrefueled range | About 6,000 nautical miles | Not published |
| Speed / ceiling | High subsonic / 50,000 ft | Not published |
| Crew | Two pilots | Designed for manned or unmanned operations |
| Weapons | Conventional or nuclear | Nuclear and conventional, stand-off and direct-attack |
| Unit cost | About $1.157 billion (FY1998 dollars) | $692 million average procurement cost (2022 dollars) |
| Fleet | 20 active (1 test) | Minimum of 100 planned |
| In service | Initial operating capability April 1997 | Operational: mid-2020s, per the fact sheet |
Stealth and survivability
The B-2’s stealth comes from “a combination of reduced infrared, acoustic, electromagnetic, visual and radar signatures,” the Air Force says, produced by “composite materials, special coatings and flying-wing design.” Many details “remain classified.”
The B-21 is “designed to operate in tomorrow’s high-end threat environment.” The Air Force describes it as one part of “a larger family of systems” for long-range strike that includes intelligence, surveillance and reconnaissance, electronic attack and communications. In other words, the Raider is meant to work inside a network rather than alone.
Range, payload and missions
The B-2’s published numbers explain its record of long nonstop missions. With an unrefueled range of about 6,000 nautical miles, it destroyed “33 percent of all Serbian targets in the first eight weeks” of Operation Allied Force by flying nonstop from Missouri and back, the Air Force says. In Operation Iraqi Freedom it flew 22 sorties from a forward location and 27 from Whiteman Air Force Base, releasing more than 1.5 million pounds of munitions.
The Air Force has not published the B-21’s range or payload. Its fact sheet says the Raider “will be able to employ a broad mix of stand-off and direct-attack munitions,” meaning weapons launched from a distance as well as bombs dropped over the target.
Crew and automation
The B-2 has a crew of two pilots: a pilot in the left seat and a mission commander in the right. The Air Force compares that with a crew of four on the B-1B and five on the B-52.
The B-21 sheet does not give a crew number. Instead it says the bomber is designed to accommodate “manned or unmanned operations.” Its open systems architecture is meant “to reduce integration risk and enable competition for future modernization,” so the aircraft can “evolve as the threat environment changes.” The Department of the Air Force Rapid Capabilities Office leads development, and the program completed its critical design review in 2018.
Cost and fleet size
Cost is the clearest difference. The B-2 fleet stayed small: the Air Force lists 20 active aircraft, one of them for testing, all based at Whiteman Air Force Base, Missouri.
The B-21 program was built around cost control. The fact sheet notes that former Defense Secretary Robert Gates “directed B-21 Average Procurement Unit Cost as a key performance parameter as the best means to control costs.” That cost covers aircraft, support equipment, training, spares and engineering changes, divided by a minimum of 100 aircraft. It is listed as $550 million in 2010 dollars, $639 million in 2019 dollars and $692 million in 2022 dollars.
Bases and timeline
The Air Force awarded the B-21 development contract to Northrop Grumman on October 27, 2015. Partners include Pratt & Whitney, Janicki Industries, Collins Aerospace, GKN Aerospace, BAE Systems and Spirit AeroSystems.
Ellsworth Air Force Base, South Dakota, will be the first main operating base and home of the training unit. Whiteman and Dyess Air Force Base, Texas, are the other preferred bases. Testing is at Edwards Air Force Base, California, and depot planning at Tinker Air Force Base, Oklahoma. For the latest program news, see our B-21 Raider update.
Which is better, B-21 or B-2?
On paper, the B-21. It is newer, built for a more dangerous air-defense environment, designed for upgrades through open systems architecture and planned in numbers five times larger than the B-2 fleet. The B-2’s strength is that it is proven: it has flown combat missions from Kosovo to Afghanistan and Iraq, and its performance is public.
Both bombers form part of the air leg of the U.S. nuclear triad.
Peter’s World’s view
Analysis: Peter’s World’s assessment, based on the sources above.
The B-21 vs B-2 question is really about scale. A $1 billion-plus bomber built in a fleet of 20 can deliver headline strikes, but it cannot be everywhere. The Air Force’s choice to make unit cost a key performance parameter shows that the Raider’s main advantage may be the number that can be bought, not any single published capability. Whether the minimum of 100 aircraft holds will matter more than any comparison chart.
Frequently asked questions
Is the B-21 bigger than the B-2?
Nobody outside the program can say yet, because its size is still classified. The comparison table above lists the B-2’s dimensions.
How many B-2 bombers are there?
The Air Force lists 20 B-2s in the active force, including one test aircraft, as of May 2026.
How much does a B-21 cost?
The Air Force puts the average procurement unit cost at $692 million in 2022 dollars, or $550 million in 2010 dollars.
Will the B-21 replace the B-2?
Yes, in effect. The B-2 does not appear in the Air Force’s description of its future bomber force, which pairs the Raider with the B-52.
Can the B-21 fly without a pilot?
The fact sheet says it is “designed to accommodate manned or unmanned operations.”
Why is it called the Raider?
It honors the Doolittle Raiders, who attacked Japan on April 18, 1942, during World War II.
This article was written by Peter with AI assistance and checked against the sources linked. See our AI use disclosure.
