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SpeedReflex

GPS speed test · Aviation

Flight Speed Test

How fast is your plane flying? Put your phone in airplane mode, hold it next to the passenger window, and see your true ground speed, altitude, and heading at 35,000 feet — no Wi-Fi needed.

GPS off
Current speed0KM/H

Max speed
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Avg (moving)
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Distance
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Trip time
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Moving time
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Heading
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Altitude
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Trip log

No points recorded yet

  • Works in airplane mode
  • Knots, km/h & mph
  • Altitude in feet & metres
  • Heading indicator
  • No in-flight Wi-Fi needed
  • 100% private

How it works

Track Flight Speed from 35,000 Feet

  1. 01

    Window Seat

    You must have a window seat; aircraft fuselage aluminum and carbon composite block radio waves.

  2. 02

    Hold Near Glass

    Hold your phone directly against the passenger window to acquire orbital GNSS satellites.

  3. 03

    Monitor Flight

    Read live ground speed, cruising altitude, and true heading in knots or km/h.

Aviation Science

Ground Speed vs Airspeed

Why your GPS speed differs from the pilot's cockpit airspeed indicators.

Ground Speed (GPS)

Measures physical movement across the earth’s surface. Strong tailwinds increase ground speed, while headwinds reduce it.

Indicated Airspeed (IAS)

Measures dynamic air pressure entering pitot tubes. Thin air at 35,000 ft means true airspeed is much higher than indicated airspeed.

Aviation Benchmarks

Commercial Aircraft Cruising Speeds

Standard long-haul airliner cruising speeds at cruising altitudes.

Commercial Aircraft Cruising Speeds
Aircraft TypeTypical Cruise SpeedMax Operating Speed
Boeing 737 / Airbus A320830 km/h (450 kn / 515 mph)Mach 0.82
Boeing 777 / 787 Dreamliner905 km/h (490 kn / 560 mph)Mach 0.89
Airbus A350903 km/h (488 kn / 561 mph)Mach 0.89
Airbus A380903 km/h (488 kn / 561 mph)Mach 0.89
Boeing 747-8917 km/h (495 kn / 570 mph)Mach 0.90

Train Speed Test.

FAQ

Flight Speed Test FAQ

Does phone GPS work in Airplane Mode?

Yes. Airplane Mode turns off cellular, Bluetooth, and Wi-Fi transmitters, but passive GPS satellite reception remains fully operational.

Do I need in-flight Wi-Fi to use this?

No. As long as you opened the webpage before losing connection, all tracking algorithms run locally in your browser with zero internet required.

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