The first 24 hours after a long-haul flight: an itinerary checklist
A travel agent's checklist for the first 24 hours after a long-haul flight: arrival times, daylight, naps and pacing, based on CDC and NHS jet lag guidance.
Jet lag is predictable, so plan around it. A practical checklist for building day one of a long-haul itinerary, based on CDC and NHS guidance rather than wishful thinking.
By Traviology · Published 2026-10-23
Every agent has seen this one. The client lands at 7:00 after an overnight flight east, and the itinerary has them on a 9:00 walking tour, a long lunch and a dinner booking at 20:30. By three in the afternoon they are asleep on a bench. The trip isn't ruined, but day one is gone, and day two often goes with it.
Jet lag isn't bad luck. It follows well-understood rules, and you can plan around them.
What the guidance actually says
The CDC Yellow Book, the US reference for travel health professionals, defines jet lag disorder as sleep problems and daytime impairment after travel across at least two time zones, and notes that one survey found 68% of international business travellers had symptoms regularly.
What agents can use is the direction effect. The body clock finds it easier to run later than earlier, and the CDC puts average adaptation at about 1.5 hours a day after flying west and 1 hour a day after flying east. On those averages a client crossing seven time zones eastward could need about a week to fully adjust. The itinerary should allow for that.
The NHS keeps it simpler. Jet lag can't be prevented, but its effects can be reduced, and it usually improves within a few days.
The checklist
Before you book
Look at arrival time, not just price. The CDC's first planning tip is to choose a flight that arrives at a time that gives the traveller the right daylight exposure. Ask what the client will actually be able to do in the hours after landing.
Count the time zones and note the direction. Write both on the itinerary. They tell you how gentle days one to three need to be.
Very short trip? Don't adjust. For trips of under about two days, the CDC suggests travellers keep their home schedule rather than adapt. The NHS gives the same advice for two to three days. For a quick business trip, schedule meetings for the client's home-time daytime where you can.
The days before departure
Suggest a gradual shift. The CDC says moving sleep one hour later per day (going west) or earlier (going east) for two to three days before the trip can shorten adjustment. The NHS says the same in plainer words. One line in the pre-departure email covers it.
On board
Live on destination time. Both sources say to time meals, sleep and light to the destination time zone, drink water and go easy on alcohol and caffeine. If the seat choice is yours, a window seat on an overnight flight means control over the blind.
Arrival day
Get them outside. The NHS says go outside during the day, because natural light helps the body clock adjust. A slow, outdoor, low-stakes activity beats a museum with timed entry.
Plan the nap. The CDC says short naps of 20 to 30 minutes help alertness, while long daytime naps make night-time sleep harder. The NHS advises against sleeping during the day at all. Either way, don't leave a four-hour gap with a hotel bed in it.
Secure the room. If the client lands in the morning, early check-in or a day-use room is worth more than almost any upgrade. A shower and a short rest change the whole day.
Keep the evening short. No late dinners or 22:00 shows on night one. Book something close to the hotel.
Set an alarm for the next morning. The NHS suggests this to avoid oversleeping and drifting back toward home time.
Days two and three
Save the expensive, timed, can't-miss things (the tasting menu, the guided full-day excursion) for day three if the flight was eastbound across several time zones.
What to leave alone
Clients will ask about melatonin and sleeping pills. The sources don't agree. The CDC describes timed melatonin as one option, while the NHS says melatonin isn't recommended on the NHS for jet lag because there isn't enough evidence it works. That split is exactly why agents should stay out of it. Suggest the client asks their doctor or pharmacist, and keep your advice to scheduling, light and pace.
Why this is worth the effort
Nobody thanks you for a well-paced day one at the time. They remember it later, when the rest of the trip went smoothly. It costs you one edit: the tour moves from 9:00 on day one to 10:00 on day three.
If you build arrival days with hotel and transfer timings side by side, the Traviology Trip Planner keeps each leg of the trip in one place.
Sources
General guidance only, not medical advice. Checked October 2026.
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