What are the system requirements for FlightGear?
FlightGear does not have one simple, fixed hardware requirement, because performance changes a lot with the aircraft, scenery, weather, screen resolution and graphics settings you use. In practice, a modern 64-bit desktop OS, a multi-core CPU, 8 GB of RAM as a floor, 16 GB preferred, and a reasonably current GPU with good OpenGL driver support are the sensible targets.
FlightGear system requirements at a glance
| Use case | CPU | RAM | Graphics | Storage | What to expect |
|---|---|---|---|---|---|
| Will it launch? | Older or entry-level multi-core desktop CPU | 8 GB | Integrated or older dedicated GPU with working OpenGL support | SSD preferred, with space for the simulator and scenery cache | Usable for lighter aircraft and reduced settings, but not ideal in dense scenery |
| Comfortable general use | Modern multi-core CPU with decent single-core speed | 16 GB | Mid-range dedicated GPU | SSD with extra room for scenery downloads | Smoother flying at moderate to higher settings in most common situations |
| Heavy scenery and complex aircraft | Faster modern CPU | 16 GB or more | Stronger dedicated GPU with ample VRAM | Fast SSD and generous free space | Best for large displays, high settings, detailed airports and more demanding add-ons |
What does FlightGear need to run?
The short answer is that FlightGear is lighter than some current commercial simulators, but it is not a tiny, no-demand program. It still benefits from modern hardware, especially on the graphics side.
These are the areas that matter most:
- Operating system: FlightGear is a desktop simulator and current builds are generally aimed at modern 64-bit versions of Windows, macOS and Linux.
- Processor: A multi-core CPU is the baseline. Strong single-core performance still matters because flight simulators often lean heavily on one or two busy threads.
- Memory: 8 GB is the practical minimum for many users. We would treat 16 GB as the more realistic target if you want fewer stutters and more headroom.
- Graphics card: The biggest compatibility trap is graphics support. FlightGear relies on OpenGL, so stable, up-to-date graphics drivers matter as much as the raw GPU itself.
- Storage: The base simulator is one thing; global scenery, cached terrain and add-on aircraft can push storage needs much higher over time. An SSD makes a noticeable difference to loading and scenery streaming.
Is a dedicated graphics card required for FlightGear?
Not always, but we would strongly prefer one. Some integrated graphics solutions can run FlightGear at reduced settings, especially at lower resolutions and with lighter aircraft. The experience can fall away quickly once you add dense airports, shadows, weather effects or high-resolution displays.
If your machine uses integrated graphics, the question is less “will it start?” and more “will it stay smooth enough to enjoy?”. FlightGear is far happier on a dedicated GPU with solid driver support.
How much RAM does FlightGear need?
For a current desktop system, 8 GB is the practical starting point. That may be enough for basic flying if you keep your settings sensible and do not have a lot else open.
We would aim for 16 GB if possible. That gives FlightGear more breathing room for larger scenery areas, complex cockpits, texture loading and background tasks from the operating system.
How much storage space should you keep free?
You need enough room for the simulator itself, plus extra space for scenery data, caching and any aircraft or environment packages you install later. FlightGear can stay fairly modest if you keep things lean, but storage usage grows as you add more of the world.
This catches people out. Automatic or on-demand scenery downloads can steadily consume disk space, so it is wise to leave generous free capacity rather than planning only for the initial install.
Why there is no single official-spec answer
With FlightGear, “system requirements” depend heavily on how you use it. A simple daytime VFR flight in a light aircraft over sparse terrain is one thing. A detailed airliner cockpit at a major airport, with heavier weather and visual effects, is something else entirely.
That is why broad ranges are more honest than one hard minimum. The simulator can run on fairly modest hardware in the right conditions, yet still reward stronger systems when you push detail higher.
What hardware affects FlightGear performance the most?
If we had to rank the parts that matter most for most users, we would put them roughly like this:
- Graphics card and driver quality for rendering and compatibility
- CPU speed for simulation workload and frame consistency
- RAM capacity for avoiding paging and reducing stutter
- SSD storage for loading times and scenery handling
Driver quality deserves a special mention. A theoretically capable GPU can still give poor results if its OpenGL support is weak or outdated.
How to tell if your PC can run FlightGear well
- Check your OS. Make sure you are on a supported 64-bit desktop operating system with current updates.
- Look at your GPU. If you only have integrated graphics, expect to lower settings. A dedicated GPU is a much safer bet.
- Check your RAM. If you have 8 GB, keep expectations realistic. With 16 GB or more, you are in a better place.
- Confirm free SSD space. Leave room not just for the install, but for scenery and cache growth.
- Start with moderate settings. Test in a lighter aircraft and less demanding airport first, then raise detail gradually.
What settings should you lower first on weaker hardware?
If FlightGear runs poorly, do not change everything at once. Reduce the expensive visual features first and test again.
- Screen resolution
- Shadows and lighting effects
- Anti-aliasing
- Cloud and weather detail
- Terrain and object density
- AI traffic or extra background simulation features
Dense airports and complex aircraft can also be the real problem, not just the graphics settings. Swapping to a simpler aircraft is often a useful test.
Do add-ons and scenery packs increase the requirements?
Yes. Extra aircraft, more detailed airports, higher-resolution textures and larger scenery coverage all raise the load on your system in different ways. Some hit storage hardest; others lean more on RAM, CPU or GPU.
That is one reason we avoid quoting a single fixed requirement. A clean install and a heavily customised setup are not the same workload at all. If you use add-ons from our library at Fly Away Simulation Downloads, plan for extra disk usage and potentially higher graphics demand.
Can FlightGear run without an internet connection?
Yes, once it is installed and the content you need is already on your machine. Internet access is mainly useful for downloading the simulator, fetching extra content and, depending on your setup, obtaining scenery data automatically.
If you plan to fly offline regularly, make sure the scenery for your chosen areas is already stored locally.
Our practical recommendation
If you want the simple buying-guide version, we would not build around the bare minimum. For a decent FlightGear experience today, aim for a modern multi-core desktop CPU, 16 GB of RAM, a dedicated GPU with reliable current drivers, and SSD storage with plenty of free space.
Can it run on less? Sometimes, yes. Will it be enjoyable in every aircraft and every location on that lower-end hardware? Usually not, and that is the part most system-requirements lists skip.