Flight Time Calculator
How It Works
This flight time calculator uses established formulas to provide accurate results.
The basic rule:
- Ground Speed = True Airspeed - Headwind (or + Tailwind)
- Enroute Time = Distance / Ground Speed
- Total Flight Time = Enroute Time + Climb/Descent Time
- Hobbs Time = Total Flight Time + ~10 min taxi/runup
Results are estimates. Consult a professional for critical decisions.
Frequently Asked Questions
How do you calculate flight time?
Flight time is calculated by dividing the distance by the ground speed (true airspeed adjusted for wind). For example, a 500 nm trip at 130 kts ground speed takes about 3 hours 51 minutes of cruise time. Add climb and descent time (typically 10-30 minutes depending on altitude and aircraft) for total flight time. Pilots add about 10 minutes to account for taxi, runup, and ground operations when estimating Hobbs (billing) time.
What is the difference between airspeed and ground speed?
Airspeed is how fast you move through the air — it determines lift and aircraft performance. Ground speed is how fast you move over the ground — it determines trip time. A 15-knot headwind reduces your ground speed by 15 knots (you arrive later), while a 15-knot tailwind adds 15 knots (you arrive earlier). At 35,000 feet, jetstream winds of 100-200 knots can dramatically affect ground speed, which is why eastbound flights are often shorter than westbound.
How fast do different aircraft fly?
Typical cruise speeds: single-engine piston (Cessna 172, Piper Cherokee) 110-140 kts, twin-engine piston (Baron, Seneca) 160-200 kts, turboprops (King Air, Pilatus PC-12) 200-300 kts, light jets (Citation CJ, Phenom 300) 350-450 kts, midsize jets (Challenger, Citation Latitude) 430-480 kts, airliners (737, A320) 450-520 kts. Actual speeds depend on altitude, temperature, weight, and power settings.
Why do flight times vary from estimates?
Real flight times differ from calculations due to: wind changes at different altitudes, ATC routing (radar vectors, holds, longer approach paths), weather deviations, restricted airspace routing, non-direct routing between waypoints, and varying climb/descent profiles. Commercial flights typically add 15-30 minutes of buffer to published schedules. Private pilots should plan fuel for the calculated time plus required reserves (30-45 minutes for VFR, 45 minutes for IFR).