Flight Duration Calculator
Pick a departure and arrival airport and get an estimated flight duration built from the real great circle distance and a typical cruising speed, with taxi, climb and descent time already folded in. Time zone differences are applied automatically, so the arrival time you see is the local time at your destination, no mental maths, no DST tables. Handy when you are timing a connection, giving someone your ETA for a pickup, or working out whether a red eye gets you in before hotel check in.
Last updated: October 22, 2026
Your result
The arrival time is shown in local time at your destination, time zone differences (including daylight saving) are applied automatically. Flight time is an estimate from the great circle distance at typical cruising speed, plus a taxi, climb and descent buffer.
The formula
airborne_time_h = distance_km ÷ cruise_speed_kmh (typical cruise ≈ 800 to 900 km/h)total_duration = airborne_time + taxi/climb/descent buffer (30 min)arrival_local = departure_local + total_duration + (offset_dest − offset_origin)time zone offsets come from the shared IANA airport dataset (DST aware)
A worked example
Karachi (KHI) → London (LHR), 6,340 km apart: depart 10:00 local, fly ≈ 7h 58m, arrive 13:58 London local time (time zone change included).
More about the Flight Duration Calculator
Air time vs. block time: what the estimate is
Pick your two airports and an optional departure time. The calculator divides the great circle distance by a typical cruise speed, adds a 30 minute taxi, climb and descent buffer, then applies the DST aware time zone offset so the arrival shown is local at your destination. What you get is the physical flight time, airlines publish longer block times with schedule padding, so expect your figure to run 15 to 30 minutes shorter than the timetable.
The arrival time anchors everything else: allow 30 to 45 minutes for deplaning, immigration and bags before quoting a pickup time, and build in the minimum connection time, 60 to 90 minutes domestic, two hours or more international, before booking an onward flight. For multi leg trips, run each leg separately and add them up.
A worked estimate: London to New York
Take London Heathrow to New York JFK, about 5,570 kilometres great circle. Divided by a typical cruise speed of 850 kilometres per hour, airborne time is 6 hours 33 minutes; add the 30 minute taxi, climb and descent buffer and the estimate is 7 hours 3 minutes. Departing at 10:00 London time in winter, you arrive at 12:03 New York time.
Airline schedules usually show longer westbound, and the gap is mostly wind: high altitude winds blow west to east, so the New York bound leg fights a headwind while the return rides a tailwind. Airlines also pad schedules for punctuality. Treat this estimate as clean physics, and the airline’s as physics plus weather, routing and caution.
Three mistakes people make with flight times
The first mistake is applying the time zone difference in the wrong direction. Flying west you subtract it, a seven hour flight can land two clock hours after it left. Flying east you add it, an eight hour overnight flight delivers you fourteen clock hours after breakfast. Landing before take off on a short flight means the sign is wrong.
The second mistake is forgetting daylight saving changeover weekends, when offsets shift by an hour because countries change clocks on different dates. The third is trusting an estimate as a guaranteed block time for a tight connection: it allows nothing for holding patterns, diversions or slot delays, so never plan a 45 minute connection around it.
Short hops behave differently from long hauls
On short routes the fixed parts dominate. A 600-kilometre hop spends about 42 minutes at cruise by the formula, but the 30 minute buffer is nearly half the 1 hour 12 minute total, and real short flights spend proportionally longer climbing and descending. A 20 minute ground hold is a nuisance long haul and a third of a hop.
On long hauls the relationship flips: the buffer is a rounding error beside ten airborne hours, and what matters is wind, the assigned routing, and how far the path bends from the great circle line. Read long haul estimates as a range of about half an hour either way; short hop estimates usually sit close to schedule.
How to use the Flight Duration Calculator
- Select your departure airport.
- Select your arrival airport.
- Enter your local departure time (optional, defaults to now).
- Read the estimated duration, distance and the local arrival time.
Frequently asked questions
How accurate is the flight duration?
Good enough to plan around: distance divided by typical cruising speed, plus a buffer for taxi, climb and descent. Wind, routing and air traffic delays move real flights around, so treat it as a guide rather than an airline schedule.
Does it include layovers?
No, this covers one non stop leg. For multi leg trips, run each leg separately and add your connection time in between.
How are time zones handled?
Every airport in the dataset carries its IANA time zone, and daylight saving is applied automatically. The arrival time you see is the local time at your destination.
Which airports can I choose from?
Around 80 major airports worldwide, each with coordinates for the distance math and an IANA time zone for the conversion.
Why is my estimate different from the airline's?
Airlines publish block times with schedule padding baked in; this tool estimates the actual physical flight time. Headwinds, tailwinds and routing can shift both figures by 15 to 30 minutes.
What is the basic flight time formula?
Flight time = distance ÷ average airspeed. A 3,000 km route at 800 km/h takes about 3.75 hours, before wind and taxi time are added.
Does flight time include taxiing on the runway?
Airline schedules bundle taxi, takeoff and landing into the published time; “air time” means wheels up to wheels down. The figure here is one all in estimate, cruise time from the distance, plus a 30 minute buffer for taxi, climb and descent. For pure air time, just knock off roughly half an hour.
Why does my return flight take longer than the flight there?
It comes down to the wind, high altitude jet streams push planes along in one direction and fight them in the other, so flying east often feels quicker than flying west. Your airline’s scheduled times already account for this, which is why the timetable is asymmetric. The calculator above gives a typical estimate either way, so it is still handy for planning pickups and connections.
Can I use this calculator for a private jet or charter flight?
Roughly, yes, but take the result as a guide rather than gospel. The estimate is built around typical commercial cruising speeds, and private jets vary more in speed, altitude and routing. It will still get you close enough for day planning and pickup times.
How do I calculate flight time?
Divide distance by average cruising speed (about 550 mph for jets), then add 30 to 45 minutes for takeoff, landing, and taxiing. A 2,500-mile flight takes roughly 2,500 ÷ 550 = 4.5 hours plus 40 minutes, about 5.5 hours gate to gate. Headwinds and routing can add 30+ minutes.