Question 1

How accurate are the flight time estimates?

Accepted Answer

Our flight time estimates use the Haversine formula to calculate great-circle distance — the shortest path over Earth's curved surface — between any two airports. We then factor in a typical cruise speed of 850 km/h and add 30–45 minutes for taxi, takeoff, climb, descent, and landing. The result is a gate-to-gate range that accounts for variable wind conditions, particularly the jet stream, which can add or subtract 30–60 minutes on long-haul routes. Actual times may vary by ±15 minutes depending on weather, aircraft type, and air traffic routing.

Question 2

How does the jet lag planner work?

Accepted Answer

The jet lag planner analyzes three key factors: the number of time zones crossed, the direction of travel (eastward or westward), and the specific airports involved. Based on circadian rhythm science, it generates a day-by-day adjustment schedule that includes optimal wake times, target bedtimes, light exposure windows (the most powerful signal for resetting your body clock), and practical tips like caffeine cutoff times and exercise recommendations. Eastward travel requires advancing your clock, which is harder, so those plans are more gradual.

Question 3

Is this tool free to use?

Accepted Answer

Yes, JetLagPlanner is completely free with no sign-up required. All calculations — flight time, time zone comparisons, and jet lag plans — run entirely in your browser using JavaScript. No data is sent to any server, no cookies are set, and no personal information is collected. We built it as a fast, private, and accessible travel planning tool.

Question 4

Does the time zone converter handle daylight saving time?

Accepted Answer

Yes. Our time zone converter uses the browser's built-in Intl API combined with IANA timezone identifiers (the same database used by operating systems and airlines). This means it automatically accounts for daylight saving time transitions, historical rule changes, and regional anomalies. You can select a specific date to see the exact UTC offset in effect for both cities — which is especially important for scheduling meetings around DST transition dates in March/April and October/November.

Question 5

How many airports are supported?

Accepted Answer

We currently support 290+ major international airports across 6 continents, covering the vast majority of commercial long-haul and medium-haul routes. Our database includes IATA codes, geographic coordinates, IANA timezone identifiers, and city/country metadata for accurate calculations. We regularly update the database to include new airports and code changes.

Flugzeit, Zeitzonen
& Jetlag — geplant.

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Flugzeit, Zeitzonen& Jetlag — geplant.