Flight Time vs Block Time: Why Your Flight Takes Longer Than Advertised
Quick answer
Flight time is how long the aircraft is in the air, from wheels-up to wheels-down. Block time is the scheduled gate-to-gate duration, including taxiing and a built-in buffer, so it is always longer. Tickets and booking sites usually show the scheduled duration, while a live flight tracker shows what is actually happening.
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Two clocks, one flight
When you book a ticket, the duration you see is normally the scheduled gate-to-gate time. When you look at a flight tracker, you are watching the aircraft itself. These two clocks measure different things, and mixing them up is the reason a flight sometimes seems to take longer, or shorter, than expected.
- Airborne time: from take-off to touchdown.
- Block time: from the moment the aircraft leaves the gate (off-blocks) to when it arrives at the gate (on-blocks).
What fills the gap
Block time includes pushback, taxiing to the runway, queueing for take-off, the flight itself, landing, taxiing to the gate and the final connection to the jet bridge or stand. At a large airport, taxiing alone can add a considerable amount of time, particularly when the runway is a long way from the terminal.
Airlines also add a small cushion to scheduled times. Schedulers use historical data to set times that the airline can meet on most days, which helps on-time performance statistics but means that a flight can arrive before the scheduled time when conditions are favourable.
Why the same route can vary
| Factor | Effect on duration |
|---|---|
| Winds and jet streams | Can shorten or lengthen the airborne time, especially on long routes |
| Airport congestion | Adds taxi and holding time |
| Runway in use | Changes taxi distance and approach path |
| Aircraft type and routing | Different speeds and paths between the same cities |
| Weather and air traffic control | Can cause detours or delays |
This is why the outbound and return legs of the same trip are often listed with different durations. A strong tailwind can make one direction noticeably quicker than the other.
Time zones make it look even stranger
Departure and arrival times on a ticket are shown in local time at each airport. If you cross time zones, you cannot subtract the two times to get the duration. A flight that leaves at 10:00 and lands at 13:00 local time may have taken far longer than three hours, depending on the zone difference. Always read the listed duration rather than doing the sum in your head.
For long-haul trips, this is especially easy to get wrong, and it is also one of the reasons connection times at the layover airport need checking in the airport's local time.
How trackers measure it
Live trackers generally show actual take-off and landing times from aircraft position data, so you can see the real airborne duration and a revised estimated arrival time. The gate arrival time is typically a few minutes later than the touchdown time, because the aircraft still has to taxi in. When you are picking someone up, add time for taxiing, deplaning and baggage claim to the tracker's landing time. Track any flight live on ScanFlyGo to see where an aircraft is right now.
A quick worked example
Imagine a scheduled one-hour-and-fifty-minute flight. The aircraft might spend ten minutes taxiing out, about an hour and a half airborne and another ten minutes taxiing in. The ticket quotes the full gate-to-gate figure, the tracker shows roughly ninety minutes in the air, and your phone may announce landing several minutes before the aircraft is actually at the stand. None of these numbers is wrong; they just describe different moments. Knowing which one you are looking at removes most of the confusion on travel day.
Using this when you book
When comparing options, look at the total journey time, not just the airborne time. A cheaper itinerary with a long connection can easily add hours compared with a nonstop. Use the filters on ScanFlyGo to compare durations side by side, and leave extra margin on tight connections, especially at big airports where terminal changes are slow. If you are on separate tickets, allow generous time, because a delay on the first flight is your risk.
For pickups and transfers, base your plan on the revised arrival time rather than the original schedule, and keep the airline's notifications switched on.
Frequently asked questions
What is the difference between flight time and block time?
Flight time is the time in the air. Block time runs from leaving the gate to arriving at the gate, so it includes taxiing and scheduling buffer.
Why does my flight sometimes land early?
Airlines build a buffer into schedules, and favourable winds or light traffic can mean an early arrival.
Can I work out flight duration from the departure and arrival times?
Not directly when time zones differ, because both times are in local time. Use the listed duration instead.
Does a flight tracker show block time?
Trackers mainly show airborne progress and estimated times. The gate arrival is usually a few minutes after touchdown.
The bottom line
Block time is the number to plan around, airborne time is what a tracker shows, and time zones can hide the truth in between. Compare itineraries on ScanFlyGo, check routes and use the live flight tracker on the day.
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