Heavy Jet (Legacy)
Gulfstream G400: Complete Specs, Performance, and Buyer's Guide (2026)
Gulfstream Aerospace
Gulfstream G400: Complete Specs, Performance, and Buyer's Guide (2026)
The Gulfstream G400 (in production from 2002 to 2003, formally post-serial number 1500 G-IVSP) is Gulfstream's rebranded designation of the GIV-SP that introduced minor modifications and modernizations to the established G-IVSP platform. Per Globalair: "Introduced in 1987, the Gulfstream IV was upgraded to the Gulfstream IV/SP in 1993. Post-serial number 1500, the GIV-SP models were further modified and rebranded as the G400." The G400 is essentially the late-production G-IVSP with additional modifications and modernized branding. Per Wikipedia: "The G400 has a large cabin, long range of 4,350 nautical miles (8,060 km) and the same comfort and design that characterize the G series. Maximum cruise height and speed are 45,000 ft and Mach 0.85. Earlier models were fitted with Honeywell's SPZ 8000 Avionics package. The SPZ 8400 Avionics Package was an option, becoming standard on later models." The G400 was produced as part of Gulfstream's broader 2002 brand restructuring along with the G300 (shorter-range variant), with the larger G450 (formerly designated GIV-X) approved by the FAA on August 12, 2004 as the modern successor. Powered by two Rolls-Royce Tay Mk 611-8 turbofan engines (same as G-IV and G-IVSP, each producing 13,850 lbf of thrust), the Gulfstream G400 delivers Mach 0.85 max speed, 459 KIAS cruise, 4,350 nm range (per Wikipedia per Gulfstream specifications), 45,000 ft service ceiling. Cabin: similar dimensions to G-IVSP (45.8 ft length, 7.3 ft width, 6.2 ft height, 1,658 cu ft volume). Accommodates 14-19 passengers (typical 14). Stage 3 noise compliant (inherited from G-IV family). Honeywell SPZ-8000 avionics earlier models / Honeywell SPZ-8400 standard on later G400 models. Three distinct living areas. Pre-owned per Wikipedia 2018: 15-year-old G300s and G400s available for $4.5M-$7M. Per Wikipedia: "Its second-hand price was below $15 million" ($21.3 million in 2024) in 2009. The G400 was the brand-modernized GIV-SP for the post-2002 market, representing Gulfstream's strategic re-branding of the established G-IV family for modern positioning. The G400 has been operationally classified within the broader G-IV family (G-IV + G-IVSP + G300 + G350 + G400 + G450) totaling over 900 aircraft produced by the end of the G450 production run on January 19, 2018.
For operators wanting Gulfstream's modernized G-IVSP brand variant with the same proven Rolls-Royce Tay 611-8 engines, substantially modernized SPZ-8400 avionics (standard on later G400 models), large cabin with same dimensions as G-IVSP (1,658 cu ft volume + three distinct living areas), Mach 0.85 max speed, 4,350 nm range, 45,000 ft service ceiling, premium Gulfstream heritage, and accessible $4.5M-$7M pre-owned market, the Gulfstream G400 represents Gulfstream's late-production G-IV family heavy-iron platform.
Gulfstream G400 Specifications at a Glance
| Specification | Value |
|---|---|
| Category | Heavy Jet (Legacy) |
| Production Status | Discontinued 2003 (succeeded by G450 in 2004) |
| Designation | Gulfstream G400 (post-serial 1500 G-IVSP) |
| Manufacturer | Gulfstream Aerospace (General Dynamics) |
| Predecessor | Gulfstream G-IVSP (post-serial 1500 rebranded) |
| Production Years | 2002 to 2003 |
| Successor | Gulfstream G450 (FAA approved August 12, 2004) |
| Industry Distinction | Rebranded G-IVSP with modernized SPZ-8400 avionics |
| Industry Distinction | Long range 4,350 nm |
| Industry Distinction | Same G-IV family heritage |
| Crew | 2 (sometimes more) |
| Passengers (Typical) | 14 |
| Passengers (Configurable) | 12 to 16 |
| Passengers (Maximum) | Up to 19 |
| Engines | 2× Rolls-Royce Tay Mk 611-8 turbofans (same as G-IV/G-IVSP) |
| Thrust per Engine | 13,850 lbf |
| Stage 3 Noise Compliance | Yes |
| Avionics (Earlier Models) | Honeywell SPZ-8000 |
| Avionics (Later Models / Optional Earlier) | Honeywell SPZ-8400 (standard on later) |
| Connectivity | Modern retrofits available |
| Max Speed | Mach 0.85 |
| Cruise Speed | 459 KIAS |
| Max Range (per Wikipedia) | 4,350 nm (8,060 km) |
| Service Ceiling | 45,000 ft |
| Cabin Length | ~45.8 ft (same as G-IVSP) |
| Cabin Width | 7.3 ft |
| Cabin Height | 6.2 ft |
| Cabin Volume | 1,658 cu ft |
| Baggage Compartment | 169 cu ft (24 bags, accessible in flight) |
| MTOW | 74,600 lb (inherited from G-IVSP) |
| Maximum Landing Weight | Increased from G-IVSP |
| Living Zones | 3 (forward club + mid + aft conference) |
| Pre-Owned (per Wikipedia 2018) | $4,500,000 to $7,000,000 |
| 2009 Pre-Owned | Below $15,000,000 |
| Total G-IV Family Production | 900+ aircraft (G-IV + G-IVSP + G300 + G350 + G400 + G450) |
History as the Modernized G-IVSP Rebrand
The G400 represents Gulfstream's strategic decision to modernize the G-IV family brand structure with the G300/G400 designations replacing GIV/GIV-SP designations in 2002.
Platform timeline:
- 1987: G-IV enters service (serial 1000)
- 1993: G-IVSP enters service (serial 1214)
- 2002: G400 rebranded (post-serial 1500 G-IVSP)
- 2002: G300 shorter-range variant launched
- 2002: Gulfstream begins design process of improved G-IVSP / G450
- 2003: G400 production transitions to G450 development
- August 12, 2004: G450 FAA approved (formerly G-IV-X)
- 2018: Last G450 delivered January 19, 2018 (ending 30-year G-IV family production)
Per Wikipedia: "The G400 has a large cabin, long range of 4,350 nautical miles (8,060 km) and the same comfort and design that characterize the G series." Per Globalair: "Post-serial number 1500, the GIV-SP models were further modified and rebranded as the G400."
Why the G400 Is Modernized G-IVSP
The G400 introduced focused brand modernization:
1. Honeywell SPZ-8400 Avionics
The defining G400 advantage:
- Standard on later models / Optional on earlier: Premium positioning
- Modernized vs G-IV's SPZ-8000: Industry-leading
- Substantially modernized integrated avionics: Premium positioning
- Industry-leading pilot interface: Modern
2. 4,350 nm Long-Range Capability
- +241 nm vs G-IVSP's 4,109 nm: Modern positioning
- 8,060 km range: Industry-leading for class
- Modern operational envelope: Premium
- Industry-leading: Premium positioning
3. Same Proven Tay 611-8 Engines
- Established proven: Modern
- 13,850 lbf per engine: Premium thrust class
- Stage 3 compliant: Industry-leading
- Industry-leading reliability: Premium positioning
4. Same Industry-Leading Cabin Heritage
- 1,658 cu ft cabin volume: Industry-leading
- 6.2 ft stand-up cabin: Premium
- 7.3 ft cabin width: Industry-leading
- Three distinct living areas: Premium customization
- Forward club + mid + aft conference: Industry-leading positioning
5. Modernized Brand Positioning
- Strategic brand refresh: Modern
- Premium G-series positioning: Industry-leading
- Modern customer perception: Premium positioning
- Industry-distinct: Modern positioning
6. Same Industry-Leading 45,000 ft Service Ceiling
- Premium positioning: Modern
- Above weather + traffic: Industry-leading
- Modern operational envelope: Premium positioning
7. Same Industry-Leading 1,658 cu ft Cabin
- Industry-leading: Premium positioning
- Three distinct living zones: Modern positioning
- Modern customization potential: Premium positioning
8. Premium Gulfstream Heritage
- Modern customer recognition: Industry-leading
- Premium positioning: Modern
- Industry-leading: Premium positioning
Cabin Interior
The G400 cabin features the same industry-leading dimensions as G-IVSP:
| Cabin Measurement | Value |
|---|---|
| Cabin Length | ~45.8 ft |
| Cabin Width | 7.3 ft |
| Cabin Height | 6.2 ft (stand-up) |
| Cabin Volume | 1,658 cu ft |
| Baggage Compartment | 169 cu ft (24 bags accessible in flight) |
Standard Configuration
- 14 Passengers Typical: Premium positioning
- 12 to 16 Passengers Configurable: Standard
- Up to 19 Passengers Maximum: Premium maximum
- Forward 4-Place Club Arrangement: Premium social
- Mid-Cabin 2-Place Club + Divan: Premium private
- Aft 4-Place Conference Seating: Premium business
- Full-Service Galley: Premium dining
- Three Distinct Living Areas: Premium customization
Cabin Features
- 1,658 cu ft cabin volume: Industry-leading
- Three distinct living areas: Premium customization
- Forward 4-place club + mid 2-place club + divan + aft 4-place conference: Modern
- Full-service galley: Premium dining
- 169 cu ft baggage (24 bags accessible in flight): Industry-leading
- 6.2 ft stand-up cabin: Premium
- Premium fit + finish: Industry-leading
- Modern customization potential: Premium positioning
Performance
Speed and Range
| Performance Metric | Value |
|---|---|
| Max Speed | Mach 0.85 |
| Cruise Speed | 459 KIAS |
| Max Range (per Wikipedia) | 4,350 nm (8,060 km) |
| Service Ceiling | 45,000 ft |
Runway Performance
| Field Performance | Value |
|---|---|
| MTOW | 74,600 lb |
| Hydro-Mechanical Brakes | Industry-leading |
| Redesigned Wheels + Tires | Premium positioning |
Typical Mission Examples
- New York to London - non-stop comfortable (transatlantic)
- Coast-to-coast U.S.: Premium positioning
- Transcontinental + transatlantic: Premium positioning
- 4,350 nm operational envelope: Industry-leading
Engines
Two Rolls-Royce Tay Mk 611-8 turbofan engines (same as G-IV and G-IVSP), each producing 13,850 lbf of thrust.
Key features:
- Same Tay 611-8 engines as G-IV/G-IVSP: Established proven
- 13,850 lbf per engine: Premium thrust class
- 27,700 lbf total thrust: Industry-leading
- Stage 3 noise compliant: Industry-leading
- 22-blade titanium fan: Modern engineering
- Premium fuel efficiency vs G-III Spey: Modern positioning
Avionics: Honeywell SPZ-8400
Modernized integrated avionics (later G400 models):
- Honeywell SPZ-8400 (standard on later models): Modern integration
- Substantially modernized vs G-IV's SPZ-8000: Industry-leading
- Six color CRT EFIS displays: Industry-leading
- Modern flight management: Integrated
- Modern weather radar: Standard
- TCAS, EGPWS: Standard
- Premium pilot interface: Industry-leading
Operating Costs
| Cost Item | Per Hour |
|---|---|
| Fuel (~480-520 GPH) | $3,000 to $3,300 |
| Engine Reserve (Tay 611-8) | $750 |
| Airframe Maintenance | $1,300 |
| Insurance + Hangar | $800 |
| Crew | $1,100 |
| Other Variable | $400 |
| Total Direct Operating Cost (Estimated) | ~$7,700/hr |
Annual operating budget estimate: $2-2.5M.
Pricing
| Year/Status | Price |
|---|---|
| Pre-Owned (2018 per Wikipedia 15-year-old G300/G400) | $4,500,000 to $7,000,000 |
| 2009 Pre-Owned (per Wikipedia second-hand) | Below $15,000,000 |
| Hourly Charter Rate | $6,000+ |
Mission Profile
Best fit profiles:
- Step-Up From G-IVSP: Modernized SPZ-8400 avionics + brand positioning
- Step-Up From Light/Mid Jets: Industry-leading cabin
- Transatlantic Operators: Premium positioning
- Premium Gulfstream Heritage Operators: Industry-leading
- Multi-Generational Operators: Premium positioning
- Accessible-Entry Modern Heavy Jet Operators: $4.5-7M
- Operators Valuing Late G-IV Family: Premium positioning
- US Military / Government Operators: C-20 variants
Less suited if:
- You need maximum range (consider G-V at 6,500 nm)
- You require modern Pro Line 21 / PlaneView avionics (consider G450)
- You need lowest acquisition cost (consider G-IV / G-IVSP early models)
- You require maximum modern fuel efficiency (consider G450)
Pros and Cons
What the G400 Does Well
- 4,350 nm range (+241 nm vs G-IVSP's 4,109 nm)
- Mach 0.85 max speed
- 459 KIAS cruise
- 45,000 ft service ceiling
- Two Rolls-Royce Tay Mk 611-8 engines (13,850 lbf each)
- 27,700 lbf total thrust
- Stage 3 noise compliant
- 74,600 lb MTOW
- Hydro-mechanical brake system
- Redesigned wheels and tires
- Honeywell SPZ-8400 avionics (standard on later models)
- Six color CRT EFIS displays
- All-glass cockpit heritage
- ~45.8 ft cabin length
- 7.3 ft cabin width
- 6.2 ft stand-up cabin
- 1,658 cu ft cabin volume
- Three distinct living areas
- Forward 4-place club arrangement
- Mid-cabin 2-place club + divan
- Aft 4-place conference seating
- Full-service galley
- 169 cu ft baggage compartment (24 bags)
- Baggage accessible in flight
- 14 passengers typical (up to 19 maximum)
- $4.5M-$7M pre-owned (15-year-old per Wikipedia)
- Below $15M second-hand 2009 reference
- Premium Gulfstream heritage
- US military C-20 variants
- Strong residual value
- Modern retrofits available
- Gulfstream worldwide service network
Tradeoffs to Understand
- Production ended 2003 (succeeded by G450)
- Brand-rebranded G-IVSP (essentially same airframe)
- Range less than G-V (4,350 vs 6,500 nm)
- Honeywell SPZ-8400 less modern than G450's Pro Line 21 / PlaneView
- Smaller cabin than G450/G550
- 2,003 was the final production year (very limited production)
Frequently Asked Questions
How is the G400 different from the G-IVSP?
The G400 is essentially the rebranded G-IVSP post-serial number 1500. Per Globalair: "Introduced in 1987, the Gulfstream IV was upgraded to the Gulfstream IV/SP in 1993. Post-serial number 1500, the GIV-SP models were further modified and rebranded as the G400." Key differences are modest: 4,350 nm range (+241 nm vs G-IVSP's 4,109 nm), Honeywell SPZ-8400 avionics standard on later G400 models (vs G-IVSP's optional / SPZ-8000), modernized brand positioning. Same airframe, same engines (Tay 611-8).
How is the G400 different from the G450?
The G450 (FAA approved August 12, 2004) is the modern successor to the G400. Per Wikipedia: "Compared to the Gulfstream IV, its fuselage is 12 in (300 mm) longer and the main entry door relocated aft. The Rolls-Royce Tay 611 engines are replaced by 611-8Cs with FADEC, redesigned thrust reversers, nacelles and pylons which increases range and payload, coupled with aerodynamic improvements. Many Gulfstream V-SP improvements are used: the Honeywell advanced flight deck display suite, electrical power generation, cabin temperature control and pressurization, nose and nose landing gear." Key differences: G450 has 12-inch fuselage stretch, Tay 611-8C engines with FADEC, modern Honeywell PlaneView avionics, substantially improved range and payload.
How is the G400 different from the G300?
The G300 is the shorter-range variant of the G-IV family launched in 2002 along with the G400. Per Wikipedia for G300 (and per AeroCorner): "A shorter range variant was created based on the GIV and given the G300 designation in 2002." The G400 has the longer 4,350 nm range vs G300's shorter range.
What engines power the G400?
Two Rolls-Royce Tay Mk 611-8 turbofan engines (same as G-IV and G-IVSP), each producing 13,850 lbf of thrust. Stage 3 noise compliant. Same engines throughout the G-IV / G-IVSP / G400 family.
How far can a G400 fly?
Per Wikipedia, the G400 has 4,350 nm range (8,060 km) - +241 nm vs G-IVSP's 4,109 nm. This enables transatlantic flights including New York to London non-stop comfortable.
What's the Honeywell SPZ-8400 advantage?
The Honeywell SPZ-8400 avionics package was an option on earlier G-IV variants, becoming standard on later G400 models. The SPZ-8400 provides modernized integrated avionics vs the G-IV's earlier SPZ-8000, with substantially improved flight management, modern weather radar, and premium pilot interface.
When did G400 production end?
G400 production ended in 2003. The G400 designation was succeeded by the G450 (formerly designated GIV-X) which received FAA approval on August 12, 2004. The G450 represents the modern successor to the G400 with substantially improved range, payload, and modern PlaneView avionics.
What's the G400 pre-owned market like?
Per Wikipedia 2018: 15-year-old G300s and G400s available for $4.5M-$7M. Per Wikipedia: "Its second-hand price was below $15 million" in 2009 (~$21.3M in 2024 dollars). Modern modifications (Pro Line 21 retrofit, ADS-B, etc.) substantially affect value.
The Bottom Line
The Gulfstream G400 (in production from 2002 to 2003, formally post-serial number 1500 G-IVSP) represents Gulfstream Aerospace's modernized rebrand of the G-IVSP - introducing minor modifications and modernizations to the established G-IVSP platform with the Honeywell SPZ-8400 avionics package standard on later models. With substantial industry-leading capabilities (same proven Rolls-Royce Tay Mk 611-8 turbofan engines as G-IV and G-IVSP providing 13,850 lbf of thrust each with Stage 3 noise compliance, 4,350 nm range / 8,060 km per Wikipedia - +241 nm vs G-IVSP's 4,109 nm, Mach 0.85 max speed at 459 KIAS cruise, 45,000 ft service ceiling, modernized Honeywell SPZ-8400 avionics package standard on later G400 models with optional on earlier - substantially modernized vs G-IV's SPZ-8000, substantial cabin of approximately 45.8 ft length + 7.3 ft width + 6.2 ft height stand-up + 1,658 cu ft cabin volume + 169 cu ft baggage compartment for 24 bags accessible in flight, three distinct living areas with forward 4-place club arrangement + mid-cabin 2-place club and divan + aft 4-place conference seating + full-service galley, 74,600 lb MTOW inherited from G-IVSP, hydro-mechanical brake system inherited from G-IVSP, redesigned wheels and tires inherited from G-IVSP), the Gulfstream G400 delivered Gulfstream's late-production G-IV family heavy-iron platform. Per Globalair: "Introduced in 1987, the Gulfstream IV was upgraded to the Gulfstream IV/SP in 1993. Post-serial number 1500, the GIV-SP models were further modified and rebranded as the G400." Per Wikipedia: "The G400 has a large cabin, long range of 4,350 nautical miles (8,060 km) and the same comfort and design that characterize the G series. Maximum cruise height and speed are 45,000 ft and Mach 0.85. Earlier models were fitted with Honeywell's SPZ 8000 Avionics package. The SPZ 8400 Avionics Package was an option, becoming standard on later models. Its second-hand price was below $15 million in 2024) in 2009 (~$21.3 million in 2024)." The G400 was produced as part of Gulfstream's broader 2002 brand restructuring along with the G300 shorter-range variant. The G400 was succeeded by the larger Gulfstream G450 (formerly designated GIV-X), approved by the FAA on August 12, 2004 - which introduced 12-inch fuselage stretch + Tay 611-8C engines with FADEC + modern Honeywell PlaneView avionics suite + substantially improved range and payload. Standard configuration accommodates 14 passengers typical (12-16 configurable, up to 19 maximum). Pre-owned market per Wikipedia 2018: 15-year-old G300s and G400s available for $4.5M-$7M. 2009 second-hand pricing per Wikipedia: below $15M. The total G-IV family production reached over 900 aircraft (G-IV + G-IVSP + G300 + G350 + G400 + G450) by the last G450 delivery on January 19, 2018 ending a 30-year G-IV family production run, replaced by the G500. Gulfstream worldwide service network continues to support the G400 platform.
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Talk to a Quantum Jets broker for Gulfstream G400 market intelligence and pre-buy diligence.
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Download the Quantum Jets app on the Apple App Store (iOS app) or Google Play (Android app), then search the Gulfstream G400 to start booking. The Quantum Jets mobile app is the fastest path from research to booking for any private jet, jet charter, private jet rental, or private jet charter marketplace transaction in the Quantum Jets catalog. AVIA Technologies maintains the private jet charter marketplace app on a continuous deployment schedule with new aircraft, new operators, and refined private jet management tooling shipping every release.
Gulfstream G400 Services from Quantum Jets
Quantum Jets supports Gulfstream G400 operators and prospective owners across the full lifecycle of private jet ownership. Whether the goal is jet charter for a one-off trip, a private jet rental for a busy season, or a private jet charter program tied to a recurring travel pattern, our team builds the right structure around the Gulfstream G400 for the mission.
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If you are evaluating a Gulfstream G400 for purchase, charter, lease, fractional access, management, refurbishment, or sale, talk to a Quantum Jets broker for a custom market scan and pre-buy diligence.
Related Aircraft Guides:
- Gulfstream G-IVSP: Direct Predecessor (1993-2002, Pre-Serial 1500)
- Gulfstream G-IV: Foundational Family Predecessor (1987-1992)
- Gulfstream G300: Shorter-Range Variant Sibling (2002+)
- Gulfstream G450: Direct Successor (2004-2018)
- Gulfstream G350: Reduced-Range G450 Variant
- Gulfstream G-V: Ultra-Long-Range Sibling
- Gulfstream G550: Modern Ultra-Long-Range Successor
- Bombardier Challenger 604: Direct Twin-Engine Heavy Competitor
Production of the Gulfstream G400 ended 2003. All G400 acquisitions are pre-owned. Gulfstream Aerospace provides worldwide parts/support. Specifications accurate as of 2026.