Flight Time Calculator
Choose two airports, use a speed preset or enter your own mph/knots, and compare great-circle distance in miles, kilometers and nautical miles.
Use the Flight Time Calculator
Route & Aircraft
Optional margin only; not live taxi, wind or routing data.
Quick Routes
Search for two cities above, then click Calculate.
Time Breakdown
| Phase | Duration |
|---|
Method and limitations
Distance follows a spherical great-circle approximation. Time uses distance ÷ selected speed, plus the allowance you enter. A cruise-speed input is a still-air estimate; use expected ground speed when you want wind reflected. This tool does not check route availability, restricted airspace, reserves, weather, aircraft performance or airline schedules. Unit definitions follow NIST SP 811; flight planning should use current operational data and the FAA Pilot's Handbook.
Summary
Choose two airports, use a speed preset or enter your own mph/knots, and compare great-circle distance in miles, kilometers and nautical miles.
How it works
- Type a city or airport name in the "From" field to search.
- Select your departure city from the autocomplete suggestions.
- Repeat for the "To" (destination) field.
- Choose a speed preset or enter a custom speed in mph or knots.
- Click "Calculate Flight Time" to see the estimated duration.
- The tool computes great-circle distance via the Haversine formula, divides by speed, then adds your optional planning allowance.
Use cases
- Estimate how many hours to budget before booking a flight.
- Compare flight durations for multiple destination options.
- Understand approximate flight times for lesser-served city pairs.
- Plan layover windows by knowing segment durations.
- Check whether a direct flight or connecting route saves significant time.
- Help students visualize global geography through flight distances.
- Quickly verify if an ultra-long-haul route is feasible non-stop.
- Estimate return leg duration when the outbound was unusually fast.