Estimate how long a flight takes between two airports from great-circle distance and cruise speed, or solve flight distance, time or speed.

Great-circle distance at a constant cruise speed. Real flights add routing, climb, descent and taxi time.

Known IATA/ICAO code, or latitude, longitude in decimal degrees.

Typical airliner cruise is about 500 mph. Change it, or pick an aircraft type under Route settings.

Route settings

Illustrative editable speeds, not aircraft performance data.

Blank means zero. Assumes wind directly along the track; excludes crosswind correction.

Blank means zero. Enter a buffer suited to your trip.

Optional YYYY-MM-DDTHH:MM, for example 2026-10-07T09:30.

Blank means UTC+0. Enter the offset effective on the departure date.

Blank means UTC+0. Account for daylight saving; offsets are not inferred.

Optional scenario input. No CO₂ estimate is shown without a factor.

Related Calculators

Flight Length Formula

The following two example problems outline the steps and information needed to calculate the Flight Length.

FL = FS × FT
  • Where FL is the Flight Length (miles)
  • FS is the average ground speed (MPH) 
  • FT is the flight time (hours) 

To calculate the flight length, multiply the flight speed by the flight time.

How to Calculate Flight Length?

The following example problems outline how to calculate Flight Length.

Example Problem #1:

  1. First, determine the flight speed (MPH).
    • The flight speed (MPH) is given as 400.
  2. Next, determine the flight time (hours).
    • The flight time (hours) is provided as 2.5.
  3. Finally, calculate the Flight Length using the equation above: 

FL = 400 * 2.5

The values provided above are inserted into the equation below and computed.

FL = FS * FT = 400 × 2.5 = 1,000 miles

Example Problem #2: 

For this problem, the variables required are provided below:

flight speed (MPH) = 500

flight time (hours) = 3

Test your knowledge using the equation and check your answer with the calculator.

FL = FS * FT = ?