DepartureMap

Flight Time Calculator

Find out how long your flight will take between any two airports. Results include distance, estimated duration, and real airline data when available.

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How Flight Time Is Calculated

Our flight time calculator uses two methods depending on data availability. For routes with direct airline service in our database, we display the average scheduled duration across all operating airlines. This is the most accurate method as it reflects real-world block times that include taxiing, takeoff, cruising, descent, and landing.

For routes without direct service data, we calculate the great-circle distance (the shortest path between two points on a sphere) using the haversine formula, then estimate flying time at an average cruise speed of 850 km/h. This estimate includes a buffer for non-cruise phases of flight.

Factors That Affect Flight Time

Several factors can cause actual flight times to vary from estimates: wind patterns (especially the jet stream), air traffic routing (flights rarely follow the exact great-circle path), aircraft type (different planes cruise at different speeds), and airport congestion (which affects taxi times). Seasonal weather can also cause diversions that add time.

Frequently Asked Questions

How is flight time calculated?
Flight time is calculated using actual route data from airlines when available. For routes in our database, we use the average duration reported across all operating airlines. For routes without direct service data, we estimate flight time using the great-circle (haversine) distance between airports at an average cruise speed of 850 km/h, which accounts for typical cruising speeds, takeoff, landing, and taxiing.
Why do flight times differ between outbound and return?
Flight times often differ because of prevailing jet stream winds. In the Northern Hemisphere, jet streams generally flow from west to east at speeds of 150–250 km/h. This means westbound flights (against the jet stream) typically take longer than eastbound flights (with the jet stream). For example, a flight from New York to London is often an hour shorter than the return journey.
What is the longest direct flight in the world?
The longest direct flight by distance is Singapore Airlines' service from Singapore to New York (SIN–JFK), covering approximately 15,350 km with a flight time of around 18 hours and 40 minutes. Other ultra-long-haul routes include Auckland to Doha (Qatar Airways, ~14,530 km) and Perth to London (Qantas, ~14,500 km).
Does wind affect flight time?
Yes, wind has a significant impact on flight time. Headwinds slow the aircraft down while tailwinds speed it up. The jet stream — a band of high-altitude winds — is the biggest factor, and can add or subtract 1–2 hours on long-haul flights. Pilots and dispatchers account for wind patterns when planning routes, sometimes flying longer distances to catch favorable tailwinds.

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The DepartureMap Flight Time Calculator uses real airline schedule data combined with great-circle distance calculations to estimate flight duration between any two airports worldwide. When a direct route exists in our database, the calculator displays the average scheduled flight time across all operating airlines.

Flight times shown are estimates based on scheduled data and standard cruise speeds. Actual flight times may vary due to weather, wind conditions, air traffic, and specific aircraft type. Always check with your airline for the most up-to-date schedule information.