Your First Long Haul Flight: The Complete Guide to Arriving Healthy, Rested and Ready
What Counts as a Long Haul Flight?
A long haul flight is generally defined as any flight lasting six hours or more. This typically includes routes from the UK to destinations such as India, Kenya, Thailand, the United States and Australia. Flights over 10 hours are sometimes referred to as ultra-long haul.
The longer the flight, the more important it becomes to prepare properly, both for comfort and for your health.
1. Choose Your Seat Strategically
Your seat choice shapes the next 10 hours more than most people realise.
Window seats give you something to lean against, no one climbing over you during the night, and slightly better sleep. Aisle seats give you freedom to move, stand, and stretch without disturbing other passengers, which becomes increasingly valuable on flights over eight hours.
Avoid the middle seat whenever possible.
Before you fly, use SeatGuru to check the specific layout of your aircraft. It maps out the best and worst seats by legroom, proximity to toilets, and recline restrictions. Rows near the back of the plane are often less popular and may leave spare seats beside you if the flight is not full.
If you are at higher risk of blood clots, an aisle seat makes it significantly easier to get up and walk regularly. More on that below.
2. Pack Smartly for the Cabin
Your carry-on determines how comfortable the next several hours will be. These are the items that genuinely make a difference.
Comfort essentials:
Neck pillow (memory foam beats airline-issued pillows)
Noise-cancelling headphones
Eye mask
Lip balm and a light facial moisturiser
Compression socks (put these on before your legs have a chance to swell)
A refillable water bottle to ask cabin crew to top up throughout the flight
Health and documents:
Passport, visa and travel insurance details in an accessible pocket
Vaccination certificate (ICVP) if required for your destination
Any prescription medication in your carry-on, never in checked luggage
A printed or digital list of your medications for emergencies
Take photos of all key documents and store them in your cloud storage or email them to yourself before you leave.
3. Stay Hydrated Throughout the Flight
Cabin air humidity can drop as low as 10 to 20 per cent, which is considerably drier than most indoor environments on the ground. This level of dryness accelerates dehydration and directly worsens fatigue, headaches, and the severity of jet lag.
The Aerospace Medical Association recommends approximately 250ml of water per hour during flight. Alcohol and caffeine both increase fluid loss at altitude, so it is best to save them for arrival.
Bring your own water bottle, drink consistently from boarding to landing, and do not wait until you feel thirsty.
4. Understand DVT Risk and What Actually Helps
Deep vein thrombosis (DVT) is a blood clot that can form in the legs during prolonged immobility. It sounds alarming, but for most healthy travellers the absolute risk is low. According to a Cochrane Database review, the risk of DVT within four weeks of a flight lasting more than four hours is approximately 1 in 4,600 flights.
The risk increases with flight length and is higher for people who are pregnant, have recently had surgery, have a personal or family history of blood clots, or are significantly overweight.
What the evidence supports:
Walking the cabin every one to two hours when the seatbelt sign is off
Ankle circles, calf raises, and knee lifts while seated
Wearing properly fitted graduated compression socks, which clinical evidence shows reduce the risk of symptomless DVT on flights over four hours
Staying well hydrated
Avoiding sleeping tablets, which limit movement during sleep
If you have known risk factors, speak to a pharmacist or GP before flying. The team at Icon Travel Clinic can advise you as part of your pre-travel consultation.
5. Wear the Right Clothing
Tight jeans and structured clothing make a long flight genuinely uncomfortable. Loose, breathable layers work best because cabin temperature varies throughout the flight, often swinging between warm and cold.
Slip-on shoes are worth choosing. Feet swell in flight, and laces become tedious on a 10-hour journey. Compression socks work best when put on at home, before your legs begin to swell at all.
6. Eat Smart on Board
Airline food is typically high in sodium, which contributes to bloating and dehydration. A heavy meal before or shortly after boarding also makes sleep harder by raising your core temperature.
Pack your own snacks for the first few hours of the flight:
Nuts and dried fruit
Oat-based bars
Fresh fruit if you will eat it before landing (check customs rules on arrival)
Eat lightly rather than skipping meals entirely when you are ready to sleep. Small meals tend to support better rest than either overeating or going hungry.
7. Beat Jet Lag Before It Starts
Jet lag happens when your internal body clock is out of sync with the local time at your destination. Eastbound travel is generally harder to adjust to than westbound. The more time zones you cross, the longer the adjustment takes.
Before departure: Start shifting your sleep schedule gradually, by around one hour per day, for two to three days before flying. This is particularly useful for long trips to East Asia or Australia.
On the plane: Set your watch to destination time as soon as you board and align your sleep and waking accordingly. If it is nighttime at your destination, try to sleep. If it is daytime, stay awake.
On arrival: Get outside into natural daylight as early as possible. Sunlight is the single most powerful signal for resetting your circadian rhythm. Avoid long naps on your first day. A 20-minute rest is fine, but anything longer delays adjustment significantly.
Melatonin is widely used to support the transition and is available over the counter in the UK. Speak to your pharmacist if you would like guidance on timing and dosage.
8. Sort Your Travel Health Before You Fly
This is the step most travellers leave too late. Some vaccines need to be given weeks before departure to be fully effective. Entry to certain countries requires proof of vaccination, and without it you may be refused boarding or vaccinated at the border on arrival.
Key vaccines to check before you travel:
Yellow Fever is mandatory for entry into many countries across sub-Saharan Africa and South America, including Nigeria, Kenya, Brazil, and Ghana. Your certificate only becomes valid 10 days after vaccination and is required to be issued by a NaTHNaC-approved centre. Icon Travel Clinic in Chigwell is an approved yellow fever vaccination centre and issues your ICVP certificate on the day of your appointment.
Hepatitis A and Typhoid are recommended for most travellers heading to Asia, Africa, and the Middle East, including popular destinations such as India, Thailand, and Vietnam. See our Hepatitis A and Typhoid pages for full details.
Malaria prevention is essential for travel to sub-Saharan Africa, parts of South Asia and Southeast Asia. Antimalarial tablets need to be started before you travel, not on arrival. Our anti-malarials page explains what is available and how to take each type correctly.
Rabies is worth considering for anyone travelling to rural areas of India, Southeast Asia, or Africa where access to prompt medical care may be limited. A pre-exposure course reduces the number of post-bite doses required and buys critical time. See our Rabies vaccine page for more.
Routine UK vaccinations including Tetanus, Polio and MMR should be up to date before any long haul travel. Many adults are unknowingly out of date.
How far in advance should you book?
Book your travel health consultation at least 6 to 8 weeks before departure. Some vaccines require multiple doses spaced several weeks apart, and your body needs time to develop immunity. If you are travelling sooner, come in anyway.
Frequently Asked Questions About Long Haul Flights
Do I need vaccinations for a long haul flight?
It depends entirely on your destination. Some countries legally require proof of yellow fever vaccination for entry. Others strongly recommend vaccines against Hepatitis A, Typhoid, Rabies, or Malaria. Book a travel health consultation at least six weeks before you fly to confirm what you need.
How do I prevent DVT on a long flight?
Walk the cabin every one to two hours, do seated leg exercises, stay hydrated, and wear graduated compression socks. If you have specific risk factors, such as a history of blood clots or recent surgery, speak to a pharmacist or doctor before flying.
What should I eat on a long haul flight?
Eat lightly and avoid high-sodium airline meals where possible. Pack your own snacks such as nuts, oat bars, and fruit. Avoid alcohol and caffeine during the flight and drink water consistently throughout. If you are travelling somewhere where traveller's diarrhoea is a risk, ask our team about prevention at your consultation.
How do I deal with jet lag after a long flight?
Get outside into natural daylight as soon as possible after arrival. Avoid long naps on your first day and align your meals and sleep to local time immediately. Adjusting your sleep schedule by one hour per day for a few days before departure also helps significantly.
Can I get travel vaccinations last minute before a long haul flight?
Yes, in many cases. Same-day appointments are available at Icon Travel Clinic in Chigwell, Essex. Some vaccines such as the yellow fever certificate do require 10 days to become valid, so the sooner you book, the better.Ready to Fly? Start With Your Travel Health
The difference between a difficult long haul flight and a manageable one comes down almost entirely to preparation. Seat choice, hydration, movement, and getting your health sorted before you go.
If you have not yet checked whether you need travel vaccinations for your destination, now is the time to act. Book an appointment at Icon Travel Clinic in Chigwell, Essex. We are a NaTHNaC-approved yellow fever vaccination centre offering same-day appointments, destination-specific health advice, and a full range of travel vaccines for Essex and surrounding areas including Loughton, Woodford, Epping, and Hainault.
Icon Travel Clinic is based at 155 Manford Way, Chigwell, Essex, IG7 4DN. We offer travel vaccinations, antimalarials, and expert travel health advice for travellers across Essex and the surrounding areas.
