Great-Circle Flight Distance & Time Calculator
Enter the coordinates of your departure and arrival cities along with an average cruising speed and timezone offset to estimate great-circle distance, flight duration, and local arrival time.
About this calculator
Calculate the great-circle distance between two cities using latitude and longitude, plus estimate flight time and timezone-adjusted arrival based on average cruise speed.
Frequently Asked Questions
How accurate is the great-circle distance?
The haversine formula assumes a spherical Earth and gives distances typically within 0.5% of actual flight paths, which follow great-circle routes adjusted for air traffic and winds.
Why does the arrival time include a 'days offset'?
Long flights crossing multiple time zones can arrive on a different calendar day than departure; the offset shows how many days later (or earlier) arrival occurs relative to departure.
Where do I find latitude and longitude for a city?
Search '[city name] latitude longitude' or check any mapping service; airport coordinates are also widely published.