Jet lag, passports and travel rules · Guide + calculator Without the guesswork.

Flight Time & Local Arrival Calculator

Convert an airport-specific itinerary duration into local arrival time, or label a great-circle duration clearly as a planning estimate. Inputs stay in your browser.

Reference toolFlight Time Arrival CalculatorConvert an airport-specific itinerary duration into local arrival time, or label a great-circle duration clearly as a planning estimate. Inputs stay in your browser.

Reference calculation

Enter your details.

Calculated locally in your browser. Nothing is uploaded to CalcSpan.

Section 1

Core details

Start with the information that defines this calculation.

Origin airport Search by IATA code, city or airport name.

Destination airport Choose an airport, not only a city.

Local departure date

Tue, Aug 25, 2026

Local departure time

Duration source

Scheduled hours

Section 2

Review and confirm

Check the remaining facts before calculating.

Additional minutes

Plain-date semantics · start date is not counted unless the result explicitly says inclusive.

Your result

Local arrival: Wednesday, Aug 26, 2026, 6:30 AM GMT+1

JFK to LHR spans 7 hours in this user-entered itinerary scenario.

Airport pairJFK New York → LHR LondonAmerica/New_York → Europe/London

DepartureTuesday, Aug 25, 2026, 6:30 PM EDT

Scheduled duration input7 hoursCopy from the current itinerary

Local arrivalWednesday, Aug 26, 2026, 6:30 AM GMT+1Date line and DST resolved from the two IANA zones

Destination clock at departure5 hours aheadOffset can change before arrival if a DST transition occurs

Great-circle distance5,540 km · 3,442 miNot an operational route distance

Timeline

Aug 25, 2026Depart JFK · 18:30 local

Aug 26, 2026Arrive LHR · 6:30 AM GMT+1

Read before relying

Context matters.

The duration is the value you entered from an itinerary; airline schedule updates control.
Airport records are explicit so metro-area airport substitutions do not silently change the result. Time-zone conversion uses the browser's IANA data.

Rule set 1.1.0

Sources & scope

Source & calculation QA reviewed

The calculation guide and this source trail show what the result means, where the rule came from and when it was last reviewed. This is source-and-calculation QA, not a claim of medical, legal, tax or other professional review; time-sensitive decisions still belong with the linked authority.

International Air Transport Association · SRC-IATA-AIRPORT-CODES-001Airport & Location Identifier DatabaseSource retrieved 2026-08-23 International Air Transport Association · SRC-IATA-LOCAL-TIMES-001Passenger and airport data interchange — scheduled departure and arrival local timesSource retrieved 2026-08-23 Internet Assigned Numbers Authority · SRC-IANA-TZDB-001Time Zone Database — civil-time history and daylight-saving rule updatesSource retrieved 2026-08-22

JurisdictionGlobal airport-pair and IANA time-zone planning — scheduled itinerary controls; great-circle mode is explicitly an estimate

Last reviewed2026-08-23

Next review due2027-02-23

Review scopeCalcSpan source & calculation QA

PrivacyNo input upload

How this calculation works

A visible path from input to answer.

Convert an airport-specific itinerary duration into local arrival time, or label a great-circle duration clearly as a planning estimate. The page keeps the calculation scope and its limits beside the result so the output can be checked, copied or revisited.

Calculation flow

Read the record. The calculator uses Origin airport, Destination airport, Local departure date, Local departure time and Duration source and 4 additional fields supplied in the form.
Apply the scope. It applies the Global airport-pair and IANA time-zone planning — scheduled itinerary controls; great-circle mode is explicitly an estimate reference and the explicit date, unit and counting conventions shown in the result.
Expose the checkpoints. Intermediate rows, warnings and timeline events stay visible; the emphasized row identifies the primary checkpoint when one exists.

Illustrative default example Local arrival: Wednesday, Aug 26, 2026, 6:30 AM GMT+1

JFK to LHR spans 7 hours in this user-entered itinerary scenario.

Scheduled duration input7 hours
Local arrivalWednesday, Aug 26, 2026, 6:30 AM GMT+1

Defaults are an illustration only. Replace them with the record that applies to your situation.

Assumptions and scope

Calculation purpose: Convert an airport-specific itinerary duration into local arrival time, or label a great-circle duration clearly as a planning estimate. This is a high-sensitivity reference output; the linked authority or qualified professional controls the final decision.

Boundary behavior

Calendar inputs use plain year-month-day semantics. Leap days, month ends, date-pair order and unsupported dates are checked before the result is shown.

Rule trail

Rule set 1.1.0 · Last reviewed 2026-08-23 · Next review due 2027-02-23. The source panel below contains the linked evidence.

Questions answered

What to know before using the result.

How do I calculate local arrival time?

Choose exact airports, enter the local departure and itinerary duration, and CalcSpan resolves the departure instant before formatting arrival in the destination IANA time zone.

Is great-circle time the actual flight time?

No. Great-circle mode is labeled as a planning estimate and cannot predict winds, routes, aircraft, taxi time, holds or airline schedules.

Does it handle the international date line and daylight saving time?

Yes. Time-zone conversion works from real instants and airport-specific IANA zones, so local date changes and DST offsets are reflected.