Flight time, time zones
& jet lag — planned.
Estimate flight duration, compare local times, and get a personalized jet lag adjustment plan. Free, fast, no sign-up.
How It Works
Three simple steps to plan your trip
Enter Your Route
Search and select your departure and arrival airports from our database.
Instant Calculations
Get flight time, distance, time difference, and jet lag severity instantly.
Get Your Plan
Receive a day-by-day jet lag adjustment plan with sleep and light timing.
Your Travel Toolkit
Everything you need for international travel planning
Popular Routes
Quick access to the most searched flight routes
What Is JetLagPlanner?
JetLagPlanner is a free, privacy-first suite of travel planning tools designed for international travelers, remote workers, and anyone who crosses time zones regularly. Built entirely as a client-side web application, all calculations run in your browser — no data is sent to any server, no account is needed, and no tracking cookies are used.
The Flight Time Calculator uses the Haversine formula to compute great-circle distances and estimates gate-to-gate duration for any airport pair in our database. The Time Zone Converter leverages the IANA timezone database through the browser's Intl API, providing DST-aware time comparisons with overlapping business hour visualization — essential for scheduling international meetings. The Jet Lag Planner applies circadian rhythm science to generate personalized day-by-day adjustment schedules with optimal light exposure, sleep timing, and activity recommendations.
Whether you're planning a business trip across the Atlantic, a vacation to Asia-Pacific, or coordinating with a distributed team across multiple continents, JetLagPlanner gives you the data and guidance you need — instantly and for free.