Dassault Falcon 6X vs Gulfstream G600: Wider Cabin or Longer Range? (2026)

In the large-cabin class, just below the ultra-long-range flagships, two jets offer very different answers to the same question. The Dassault Falcon 6X has the widest and tallest cabin of any purpose-built business jet. The Gulfstream G600 flies about 1,100 nm further and a little faster. Which matters more to you decides the winner.

Quick answer: the Falcon 6X wins on cabin comfort: 102 in wide, 78 in tall, 30 windows plus a skylight, and it costs less (about US$54 million). The G600 wins on range and speed: 6,600 nm and Mach 0.925, with a longer cabin for up to 19 passengers (about US$59.5 million). Choose the 6X for transatlantic comfort, the G600 for longer routes.

Figures come from the makers’ pages for the Falcon 6X and G600, with dates and prices from Wikipedia: Falcon 6X and Wikipedia: Gulfstream G400/G500/G600. For more on the Dassault jet, read our Falcon 6X review.

Falcon 6X vs G600 at a Glance

Sources: Dassault Falcon: Falcon 6X, Gulfstream: G600; dates and prices from Wikipedia. Bold marks the better figure.

Background: A Newcomer and an Established Seller

The G600 is part of Gulfstream’s clean-sheet GVII family with the smaller G500. Wikipedia says it was unveiled in October 2014, first flew on 17 December 2016, was certified by the FAA on 28 June 2019 and first delivered on 8 August 2019, succeeding the G550. Wikipedia counts more than 200 G600s built.

The Falcon 6X replaced Dassault’s cancelled Falcon 5X, keeping its very wide cross-section but switching to Pratt & Whitney Canada engines. It first flew on 10 March 2021, was certified by the FAA and EASA in August 2023 and entered service on 30 November 2023, according to Wikipedia.

Cabin: The Falcon 6X’s Big Advantage

The 6X cabin is 11 in wider and 4 in taller than the G600’s. Wikipedia calls it the widest purpose-built business jet cabin. At 78 in (6 ft 6 in), almost every passenger can walk upright, and the extra width allows wider seats with a proper aisle between them. Dassault adds 30 extra-large windows plus a skylight in the galley.

The G600 answers with length: its cabin is about 5 ft longer (45 ft 2 in against 40.3 ft), which lets Gulfstream fit up to four living areas and seat up to 19, or sleep up to 10. Its 14 Panoramic Oval Windows are, Gulfstream says, the largest in business aviation, and it supplies 100% fresh air with a cabin altitude of 3,255 ft at 41,000 ft. Total volume is almost identical: 1,884 cu ft for the G600 against 1,843 cu ft for the 6X.

Source: Gulfstream: G600. Dassault lists 12 to 16 seats for the Falcon 6X, and Wikipedia describes a 16-seat, three-zone layout.

Range and Speed: The G600 Leads

The G600 flies 6,600 nm at Mach 0.85 and still 5,600 nm at Mach 0.90, with 8 passengers and 4 crew. Gulfstream says that at Mach 0.90 it can link New York and Dubai, London and Beijing, or Los Angeles and Shanghai nonstop. Its maximum operating speed is Mach 0.925.

The Falcon 6X flies 5,500 nm with 8 passengers, or up to 5,100 nm at Mach 0.85, and has a Mach 0.90 maximum. Dassault’s examples are Los Angeles to Geneva, São Paulo to London and Paris to Johannesburg. For the US East Coast to Europe, both are more than enough; for the US to the Middle East or Asia nonstop, the G600 has the margin.

Short Runways and Steep Approaches

Here the Falcon 6X has a clear edge. It needs 5,115 ft to take off at maximum weight against 5,700 ft for the G600, and its approach speed is just 110 kt, helped by Rafale-style flaperons. Dassault says it can use steep-approach airports such as London City and Lugano. That matters for owners who want to land close to a city centre.

Engines and Cockpit

Both jets use Pratt & Whitney Canada engines from the same PW800 family: two PW812D of 13,500 lb on the 6X and two PW815GA of 15,680 lb on the heavier G600. Gulfstream says the G600 is 12% more fuel-efficient than the older G550 on a 5,000 nm trip.

• Falcon 6X: EASy IV flight deck on Honeywell Primus Epic, digital flight controls with envelope protection, FalconEye combined vision on the HUD with guidance down to 100 ft, and a nitrogen inerting system for the fuel tanks.
• G600: Symmetry flight deck with ten touch screens and linked active side-sticks, an Enhanced Flight Vision System that lets authorised pilots land in low visibility, and a synthetic-vision primary flight display.

Price

Wikipedia lists the Falcon 6X at about US$54 million equipped (2023) and the G600 at about US$59.5 million (2022). The 6X is the cheaper aircraft even before allowing for the different years, and it is the newer design.

Which Should You Choose?

• Choose the Falcon 6X if you mostly fly up to about 5,000 nm (for example US to Europe), want the roomiest cabin cross-section and the most daylight, or need access to short and steep-approach airports.
• Choose the G600 if you need 6,000 nm-plus routes such as US to the Middle East or Asia, want to cruise at Mach 0.90 on long legs, or need seats for more than 16.
• Also consider the Bombardier Global 6500, which flies 6,600 nm with a 95 in wide cabin. See our Bombardier guide.

Our Verdict

The Falcon 6X is the more comfortable cabin and the better short-field performer, and it costs less. The G600 is the more capable traveller, with 1,100 nm more range, more speed and more seats. For a typical owner flying transatlantic, the 6X’s space is noticeable on every trip; for owners who regularly cross the Pacific or fly the US to the Gulf, the G600 is the safer bet. See every option in our guides to Dassault Falcon and Gulfstream jets, and start with private jet sizes explained.

Key Takeaways

• The Falcon 6X has the widest, tallest cabin: 102 in wide and 78 in tall, against 91 in and 74 in for the G600.
• The G600 flies further (6,600 nm against 5,500 nm) and faster (Mach 0.925 against Mach 0.90).
• The G600 cabin is about 5 ft longer and seats up to 19; the 6X seats 12 to 16.
• The 6X needs less runway and can use steep-approach airports such as London City.
• Prices: about US$54 million for the 6X (2023) and US$59.5 million for the G600 (2022).

Frequently Asked Questions

Featured image: FlyingFuel graphic using a photo of the Dassault Falcon 6X F-WSIX at the 2025 Paris Air Show by Ibex73, CC BY 4.0, via Wikimedia Commons.