Gulfstream G400: The Range's Newest Addition

A programme still in flight testing

Unveiled on 4 October 2021 at the Savannah headquarters, alongside the G800, the G400 first flew on 15 August 2024, a 2-hour-54-minute flight at Mach 0.85 and 41,000 feet, operated on a sustainable aviation fuel blend. As of June 2026, three aircraft are taking part in the test campaign.

Let us be precise about the schedule, because many sources gloss over it: the 2025 entry into service targeted at unveiling was not met, and Gulfstream has communicated no replacement timeline. As of mid-2026, neither US type certification, nor European certification, nor a first delivery date is public. The manufacturer anticipated as early as 2022 a longer campaign than those of the G500 and G600, owing to the new engine variant and tightened certification requirements.

Announced range and performance

All the figures below are preliminary: Gulfstream publishes them subject to change for as long as the aircraft is not certified.

The 4,200 nautical mile range is announced at Mach 0.85 with 8 passengers, 3 crew and regulatory reserves. Among the non-stop city pairs cited by Gulfstream to position the aircraft: Munich to or from Mumbai, Zurich to or from New York and Geneva to or from Dubai, on the basis of this as-yet uncertified performance.

A cabin derived from the G500 and G600

The G400 takes over the fuselage cross-section and the winglet-equipped clean wing of the G500 and G600. Its cabin measures 11.07 metres long (excluding the baggage compartment), 2.31 metres wide and 1.88 metres high, which is exactly the same width and height as its larger siblings. The difference lies in length, and therefore in the number of windows: 10 panoramic oval windows, against 14 on the G500 and G600.

Three layouts are offered, seating 9, 11 or 12, with up to two and a half living areas and berthing for five. The air is 100% fresh, never recirculated, purified by an ionisation system.

Flight deck and engines

The G400 receives the Symmetry Flight Deck, first introduced on the G500, complemented by a predictive landing performance system. For power, two Pratt & Whitney PW812GA engines of around 13,500 lb of thrust each, a variant certified by the Canadian authorities in September 2022 after more than 3,400 hours of testing. The G400 is expected to fall under the same type rating as the G500 and G600, which would simplify crew transition, but that extension is not yet secured.

European debut and a first claimed record

The G400 was presented in Europe on 8 June 2026, at Gulfstream's facility at Farnborough Airport, during a private customer event. This is worth spelling out, as the confusion is common: it was not the Farnborough air show. The aircraft on display was one of the three engaged in the test programme, not an aircraft delivered to a customer.

To reach the United Kingdom, the aircraft flew Washington to Farnborough in 6 hours and 12 minutes, over 3,250 nautical miles at an average of Mach 0.87, on a 70% sustainable fuel blend: a first city-pair speed record claimed by Gulfstream, whose homologation is not confirmed. Worth noting for European charter: as early as September 2024, Germany's DC Aviation Group ordered the first G400 destined for dedicated charter in Europe.

The G400 in the Gulfstream range

A useful clarification: the G400 does not replace the G280. It is the G300, unveiled on 30 September 2025 and powered by Honeywell engines, that succeeds it in the super-midsize segment; it made its own first flight on 5 December 2025. Two Gulfstream aircraft are therefore currently in certification. The G400 slots in below the G500 and the G600, while the top of the range is held by the G700 and the G800, certified in April 2025, alongside the emblematic G650.

Chartering a Gulfstream with IBC Aviation

As the G400 is not yet in service, we currently point you towards the available aircraft in the range, from the G500 to the G650, depending on your itinerary. We handle the flights, the slots and the ground handling. See our ultra-long-range fleet, our full private jet fleet and our private jet charter offer.

Private jet charter with IBC Aviation:

Our teams advise you on the private jet best suited to your itinerary and requirements, and arrange your flight to or from your destination. Available 24/7:

• France: +33 1 41 69 88 88
• Switzerland: +41 22 880 28 88
• Dubai: +971 55 303 5161
• Bangkok: +66 81 808 2866
• Email: contact@ibc-aviation.com

Frequently asked questions

Is the Gulfstream G400 certified?

No. As of mid-2026, the G400 continues flight testing with three aircraft and has received neither US nor European certification. No certification or first delivery date has been made public.

What is the announced range of the G400?

4,200 nautical miles, or 7,778 km, at Mach 0.85 with 8 passengers and regulatory reserves, and 3,950 nautical miles at Mach 0.88. These figures are preliminary and published subject to change.

How many passengers can the G400 carry?

Three layouts are offered, seating 9, 11 or 12, with up to two and a half living areas and berthing for five.

What is the difference between the G400 and the G500?

The G400 shares the G500's cabin width and height as well as its fuselage cross-section, but its cabin is shorter (11.07 m against 12.65 m) and has 10 windows against 14. Its announced range is also lower, 4,200 nautical miles against 5,300.

Does the G400 replace the G280?

No. It is the G300, unveiled on 30 September 2025 and in flight testing since December 2025, that succeeds the G280 in the super-midsize segment.