Traveling with a Sick Child: When to Delay Travel

<p>A child who gets ill just before a trip leaves you with a hard decision and very little time. This guide doesn't diagnose or decide for you. It sets out what health bodies say about common illnesses and travel, which signs need urgent help, and what to ask your doctor, airline and insurer.</p>

Last reviewed: November 2026. This guide draws on the US Centers for Disease Control and Prevention (CDC) Yellow Book 2026, the NHS, the American Academy of Pediatrics (AAP) and GOV.UK. It’s general information, it hasn’t been reviewed by a clinician, and it can’t tell you whether your child is fit to travel. Only a health professional who knows your child can do that. If you’re worried about your child now, call your local emergency number or healthcare provider.

It’s the night before you fly and your child has a temperature. You’ve paid for the trip, everyone’s packed and you’re trying to work out whether this is a passing cold or a reason to stay at home. There’s rarely an easy answer, and no website can give you a yes or no. But there are some useful questions to ask, and health bodies are clear on some points. This guide brings them together, so you can have a better conversation with your doctor, pharmacist, airline and insurer.

Quick answer

• Respiratory infections: the CDC says people with confirmed or suspected acute respiratory infections should delay travel.
• Ears and congestion: the CDC says travellers with ear, nose and sinus infections or severe congestion might choose to postpone flying. The AAP says to ask your doctor if your child had ear surgery or an ear infection in the 2 weeks before your trip.
• Chickenpox: the NHS says children should stay off school or nursery until all spots have formed a scab, usually about 5 days after they first appeared.
• Vomiting and diarrhoea: the NHS says to stay off school or work until there’s been no sickness or diarrhoea for at least 2 days.
• Young babies: the NHS says a baby under 3 months with a temperature of 38°C or higher needs urgent help.
• Before cancelling, check what your insurer and airline need from you.

Three questions to ask

1. Is your child well enough? Would they cope with a long day, with hard-to-avoid queues, poor sleep and little chance to rest? Could they get worse on the way?
2. Could they pass it on? Think about other passengers, people at your destination, and anyone who may be particularly vulnerable.
3. Can you get help where you’re going? Will you be near medical care? Do you have insurance? What’s the language, and can you get their medicines?

Common illnesses: what the sources say

The NHS school guidance below isn’t written for travel, and it isn’t an airline rule. But it’s a useful yardstick for when a child may still be infectious or unwell.

Urgent signs: don’t travel, get help

The NHS lists signs that need urgent care. Use your local emergency number if you’re abroad.

Call 999 or go to A&E if your child:

• has a stiff neck, is bothered by light, or has a rash that doesn’t fade when you press a glass against it
• has a fit for the first time
• has unusually cold hands and feet, or changes to skin colour, such as blue, grey, paler than usual or blotchy
• is breathing very fast or has difficulty breathing
• has swollen lips, tongue or throat, with difficulty swallowing or talking
• has a weak, high-pitched or continuous cry
• is difficult to wake, has fainted, or can’t be woken
• hasn’t had a pee in the past 12 hours

Call 111 (or the local equivalent) if your child:

• is under 3 months with a temperature of 38°C or higher, or 3 to 6 months with a temperature of 39°C or higher
• has other signs of illness, such as a rash, as well as a high temperature
• has had a high temperature for 5 days or more
• doesn’t want to eat, or isn’t their usual self, and you’re worried
• is dehydrated, for example with nappies that aren’t very wet, sunken eyes and no tears when crying

The NHS’s page on seriously ill children says a very high temperature in a very young baby can need immediate help, and adds: trust your instincts. Lists like this aren’t complete. In the NHS page on babies under 5, signs may differ for very young children. For more on babies, see our guide to travel with a newborn.

If you decide to delay: step-by-step

1. Get a health professional’s advice, and ask them to put it in writing if you might need to claim.
2. Call your insurer before you cancel. Read what your policy says about pre-departure illness. Many need specific evidence. See our guide to family travel insurance. GOV.UK says that failing to declare a condition may invalidate your insurance, so tell the insurer about any change, especially if the illness is linked to something existing.
3. Contact the airline. Ask what your options are if you can’t fly, including changing dates. Ask about their rules for infectious illnesses, too. We couldn’t confirm these for individual airlines, so ask directly.
4. Tell your accommodation, and any tour or attraction you’ve pre-booked.
5. Keep records: notes, receipts and the names of people you’ve spoken to.

If you decide to go

• Pack a small sick kit. Include a thermometer, age-appropriate medicine, oral rehydration sachets if advised by a pharmacist, and spare clothes. See our first-aid kit guide.
• Bring medicine with you in the cabin. Keep it in its packaging. GOV.UK says that medicines are among the exemptions to its normal liquid limits, so check the details. See our guide to airport security.
• Know the age limits. The NHS says not to give paracetamol to a child under 2 months, or ibuprofen to a child under 3 months, or under 5 kg, or with chickenpox, or who’s dehydrated. It also says not to give aspirin to under-16s, and not to give medicine to stop diarrhoea to children under 12.
• Plan fluids. The CDC says that infants and children with diarrhoea can become dehydrated more quickly than adults, and that dehydration is best prevented and treated with oral rehydration solution in addition to usual food. The NHS says to carry on breast or bottle feeding, and not to make formula weaker.
• Work out how to get help. In the EU, the number 112 is the emergency number. Save your destination’s number, your insurer’s helpline and your nearest hospital in your phone. Our guide to hygiene on planes has tips for the flight itself.
• Protect others. Encourage hand washing and throwing away tissues, as the NHS suggests. The CDC says that masks may reduce transmission on board, so ask your doctor if it’s suitable for your child’s age.

If your child falls ill while you’re away

1. Get care first. In an emergency, call the local number.
2. Then call your insurer’s helpline. GOV.UK suggests checking whether your insurer has a 24-hour helpline, and sharing your policy details with people you’re travelling with.
3. Keep your paperwork, including prescriptions and receipts.
4. Ask about flying home. If a doctor has treated your child, ask them whether it’s safe to fly, and what the airline may need. Medical travel home can be expensive, as GOV.UK warns.
5. Be wary of medicines you don’t recognise. Check the active ingredient, not the brand name, and ask a pharmacist.

Common mistakes and real-world scenarios

• Dosing to get through security. Lowering a temperature with medicine doesn’t mean that your child is better or no longer infectious. Don’t let it make the decision for you.
• Cancelling first, calling second. Check your policy before you cancel anything, if there’s time.
• Assuming a sibling is fine. With something like chickenpox, the NHS says that you can spread it from 2 days before spots appear. Ask your doctor if a sibling might be next, especially when you’re visiting someone vulnerable.
• Visiting a newborn or a pregnant relative. The NHS warns about chickenpox risks to these groups, so tell them.
• Not having a thermometer. It’s hard to follow any fever advice without one.
• Swimming too soon. The NHS says to wait until at least 48 hours after symptoms of sickness or diarrhoea stop.

Next steps

Read our carsickness guide for symptoms that come with travel, and our guide to baby and toddler jet lag for what’s normal after a long flight.