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Flight Time Calculator — Estimate Flight Duration Between Cities

Calculate estimated flight time, distance, and time zone difference between 50+ major cities worldwide. Plan your travel schedule with accurate estimates. 100% free, no sign-up required.

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Free Flight Time Calculator — Estimate Your Travel Duration

OptiDrop's Flight Time Calculator helps you estimate how long a flight will take between any two of 50+ major cities worldwide. The calculator uses great-circle distance (the shortest path over the Earth's surface) and average commercial flight speed to provide a realistic estimate of your flight duration.

How the Flight Time Calculator Works

Select your departure and arrival cities from the dropdown menus. The calculator computes the great-circle distance using the Haversine formula, then divides by an average commercial aircraft speed of 850 km/h. Additional time is added for takeoff, landing, and typical routing adjustments. The result includes the time zone difference between the two cities.

Factors Affecting Flight Duration

Actual flight times vary based on wind conditions, air traffic routing, weather, aircraft type, and airline-specific flight paths. Eastbound flights are often faster due to jet stream winds. Use our estimate as a planning guide and always check with your airline for exact schedules.

Frequently Asked Questions

Flight time is estimated using the great-circle distance between two cities (the shortest distance over the Earth's surface) divided by average commercial aircraft speed (approximately 800-900 km/h). The calculation also factors in additional time for takeoff, landing, taxiing, and typical routing adjustments, adding approximately 30-45 minutes to the raw estimate.
Actual flight time can differ due to several factors: wind patterns (headwinds slow flights, tailwinds speed them up), air traffic control routing, weather diversions, the specific aircraft type, and airline-specific flight paths. Flights going eastward are often faster due to prevailing jet stream winds.
As of 2025, the longest non-stop commercial flight is Singapore Airlines' route from Singapore to New York (JFK), covering approximately 15,349 km with a flight time of about 18-19 hours. Other ultra-long-haul routes include Perth to London, Auckland to Doha, and Los Angeles to Singapore.
Great-circle distance represents the shortest path between two points on a sphere, but actual flight paths are typically 5-10% longer due to jet stream routing, airspace restrictions, weather avoidance, and air traffic control requirements. Our calculator uses great-circle distance as a baseline and adds a realistic buffer.

Last updated: June 2026