A GPS speedometer for a plane
A GPS speedometer for flying, with the dial scaled up to 600 knots (about 1,100 km/h) to cover airliner cruise speeds. From a window seat it shows your plane's ground speed in knots, km/h or mph, with your top and average speed. Everything runs on your device; nothing is uploaded.
How Plane Speedometer works
Ground speed, not airspeed
Your phone's GPS measures ground speed — how fast you are moving over the earth. That differs from the airspeed pilots use, because a tailwind or headwind can change ground speed by 100–200 km/h. A typical airliner cruises around 800–900 km/h (about 450–490 knots) ground speed.
Using it in flight
- Enable your phone's location; flight mode is fine as GPS still works, but allow location access first.
- Sit by a window and start tracking once airborne.
- The reading drops when the window view of the sky is blocked; it recovers when the signal returns.
See also the main GPS speedometer and the speed converter.
Common uses
- See your flight ground speed
- Show plane speed in knots
- Switch between knots, km/h and mph
- Track top speed in the air
- See average speed on a flight
- Use from a window seat
- Large digital speed display
- Compare cruise speeds
Frequently asked questions
Can I use a speedometer on a plane?
Yes — with a window seat and location enabled, your phone GPS shows the plane ground speed.
Is this airspeed or ground speed?
Ground speed — your speed over the earth, which differs from airspeed because of wind.
How fast does a plane fly?
Airliners cruise around 800–900 km/h (450–490 knots) ground speed.
Does it work in flight mode?
GPS still works in flight mode, but you must allow location access for the browser.
Is my location uploaded?
No — it stays on your device.
Is it free?
Yes, completely free.