Flight Time Calculator

About This Tool

This flight time calculator uses the Haversine formula to compute great-circle distance between two cities, then estimates flight duration based on an average commercial aircraft cruise speed of 850 km/h. An additional 45 minutes is added to account for taxi time, takeoff, climbing to cruise altitude, descent, approach, and landing.

Why Estimates May Differ from Actual Flight Times

Several factors cause real flight times to differ from these estimates. Aircraft rarely fly in a perfectly straight line due to air traffic control routing, restricted airspace, and weather avoidance. Jet stream winds significantly affect east-west flights: a New York to London flight is typically 6.5-7 hours eastbound but 7.5-8 hours westbound due to headwinds. Airport congestion can add significant taxi and holding time at busy hubs.

Planning for Long-Haul Flights

For flights over 8 hours, factor in jet lag recovery time. A general rule is that you need one day of recovery for each timezone crossed. Staying hydrated, avoiding alcohol, and adjusting your sleep schedule before departure can reduce jet lag impact. For ultra-long-haul flights (14+ hours), consider breaking the journey with a stopover to reduce fatigue.

Understanding Timezone Differences

The timezone difference shown helps you plan your arrival time. If you depart New York at 6 PM for London (5-hour flight, +5 hour timezone difference), you arrive at approximately 6 AM London time. This is useful for deciding whether to sleep on the flight and for scheduling ground transportation and hotel check-in at your destination.