Jet Lag Planner

Last updated: August 13, 2026

Use the jet lag planner below to build a simple sleep-shift plan before a long-haul trip. It is designed for travelers who want a practical answer now: how far to move sleep, whether you’ll need to shift earlier or later, and what to focus on after landing.

What this is: a simplified sleep-shift estimator based on your time-zone gap and prep days. It is not a clinical circadian planner — it does not use exact time zones, travel dates, daylight-saving changes or a personalized bright-light schedule. Use it for planning, and follow the connection between its estimate and the public-health guidance from the CDC Yellow Book and NHS. Methodology reviewed 13 August 2026.

Build Your Jet Lag Plan

Estimate how far your body clock needs to move, then get a simple pre-trip sleep-shift plan and arrival-day focus notes.

Home time zone

Destination time zone

Usual bedtime

Usual wake time

Days before departure to prepare

Trip length

Arrival local time

I need to be sharp for work, meetings or driving within 24 hours of arrival I want a conservative plan because sleep disruption usually hits me hard

Your sleep-shift estimate

Body-clock shift

Shortest shift

Pre-departure bedtime
(home time)

Pre-departure wake
(home time)

Pre-trip shift:
Arrival-day focus:
Light note: Light can shift your body clock either earlier or later depending on timing. The best light windows vary by route and body-clock phase, and this simplified planner does not calculate a clinical bright-light schedule — see the CDC jet-lag guidance.
Direction note:
Planner caution:

How This Jet Lag Planner Works

This tool does not try to act like a medical device. Instead, it uses the planning advice most travelers actually need: your time-zone difference, your normal sleep schedule and how many days you have before departure.

Choose your home and destination time zones.
Enter your usual bedtime and wake time.
Tell the planner how many days you can prepare before departure.
Use the output as a realistic shift target, not a perfect guarantee.

Quick Examples

Example 1: New York to London with three prep days usually calls for an earlier schedule before departure, because eastbound travel often means trying to sleep before your body is ready.

Example 2: London to Dubai with only one prep day may still leave some mismatch after arrival, but even a partial shift can make the first destination day feel easier.

Example 3: A short westbound business trip can be a case where protecting sleep and managing alertness matters more than forcing a full reset.

When This Planner Is Most Useful

Long-haul leisure trips where you have a few days to prepare.
Business travel where the first destination day matters.
Eastbound flights that tend to feel harder than westbound ones.
Trips where you want a planning answer before deciding how aggressively to shift your routine.

When This Planner Can Be Wrong

This is a planning tool, not a medical diagnosis. Your actual experience can change because of age, sleep debt, stress, alcohol, overnight flight timing, individual sensitivity, illness or how much daylight you really get after arrival.

Important Things This Tool Does Not Replace

This planner does not replace medical advice, airline rest requirements or professional guidance about melatonin, sleeping tablets or other treatment choices. If you have a sleep disorder, are pregnant, take medication or need safety-critical performance soon after landing, get advice that fits your situation.

Methodology

Calculation methodology, version 1.1 — source-checked 13 August 2026. The estimator follows widely accepted jet-lag planning principles (CDC Yellow Book, NHS): shifting earlier suits an eastward body-clock change, shifting later suits a westward one, and a few days of gradual adjustment usually beats a last-minute reset. Here is exactly what it does:

Time-zone gap: it takes the difference between your two selected UTC offsets and normalizes any gap greater than 12 hours to the shortest circadian shift (so an 18-hour gap becomes a 6-hour shift in the opposite direction).
Direction: a positive shortest-shift means advance (earlier); negative means delay (later). This is the shortest way to move your body clock — on date-line routes it can differ from your geographic direction of travel.
Maximum shift per prep day: up to 60 minutes/day earlier for an advance, or 90 minutes/day later for a delay; the “sleep hits me hard” option caps both at 60 minutes/day.
Targets: your pre-departure bedtime and wake targets are your usual times moved by the total planned shift, expressed in your home time zone. Any gap the prep days can’t cover is reported as remaining mismatch to expect after arrival.
Trip length & commitments: short trips trigger a “protect sleep rather than fully reset” note; ticking the safety-critical box adds a driving/alertness warning.

What it does not calculate: exact IANA time zones, specific travel dates, daylight-saving changes, half-hour/quarter-hour offsets, a clinical bright-light (phase-response) schedule, or meal timing. It does not tell you whether an airline will accept a schedule, and it is not a medical device. TripBuffer is independent; if you spot an error, tell us via the contact page.

Source Checks

This planner has been reviewed against public-health and sleep guidance from the CDC Yellow Book and NHS, covering jet lag, circadian shift, light timing and realistic pre-travel adjustment windows. In the interest of transparency: it has not yet been reviewed by a named sleep-medicine clinician or circadian researcher, so treat the output as general planning information rather than clinical advice.

Related Tools and Guides

For the practical overnight-flight side of the same problem, use Best Red-Eye Flight Survival Guide.

If this trip is a true long-haul time-zone jump rather than a shorter overnight, read our guide on how to prepare for jet lag on long-haul flights for the sleep and light strategy behind this tool.

Frequently Asked Questions

Can a jet lag planner completely prevent jet lag?

No. A planner can reduce the disruption by helping you shift sleep, light and routine more deliberately, but it cannot completely remove the effect of crossing time zones.

Is eastbound travel usually harder than westbound travel?

Yes. Eastbound travel often feels harder because you usually need to fall asleep earlier than your body clock expects.

Should I fully shift my schedule for a very short trip?

Not always. For a short trip, it can be better to protect sleep and manage alertness rather than trying to force a full body-clock reset.

Does this tool tell me to use melatonin or sleeping tablets?

No. This planner focuses on timing, light and routine. If you are considering medication or supplements, check professional advice that fits your medical situation.

Reviewed by Muhammad Umar Khan

Founder and editor of TripBuffer. Reviewed against public-health and sleep guidance from the CDC Yellow Book and NHS. This is general travel-planning information and has not been clinically validated. For our research standards, see the Editorial Policy.