Flying with Baby Formula: Security Rules, Packing Tips, and What to Expect

Published March 15, 2026

You can bring formula on a plane. This is not complicated, but parents worry about it because the liquid rules feel arbitrary and security screening can be stressful with a baby. Here’s what you need to know.

Formula is exempt from liquid restrictions

In the US, UK, EU, Australia, and most countries, baby formula (liquid, powder, and pre-mixed) is exempt from the standard 100ml / 3.4oz liquid limit. You can bring as much as you reasonably need for the journey. This applies to breast milk too.

“Reasonably need” means enough for the flight plus a buffer for delays. Nobody is going to measure it. If you’re carrying 20 bottles for a 2-hour flight, you might get questions. For a long-haul flight with a connection, bring plenty.

What happens at security

Tell the security officer you have formula before you put your bags through the scanner. In most airports, they’ll:

  1. Ask you to take it out of your bag
  2. Run it through the X-ray separately
  3. Possibly open and test it (a small strip dipped in, or a swab of the container)

X-ray machines do not affect formula or breast milk. This has been studied. Don’t worry about it.

Some airports have dedicated family lanes. Use them if available. The staff are used to baby supplies and the process is faster.

Powder vs liquid vs ready-to-feed

Powder is the easiest to travel with. It’s not a liquid, takes up less space, and some airports won’t even flag it. Measure it into portions before the flight. Bring empty bottles and ask the cabin crew for warm water when you need it.

Ready-to-feed (the small pre-sealed bottles or cartons) is the most convenient in the air. No mixing, no water temperature worries. The downside: it’s heavier, takes more space, and is more expensive. Worth it for long flights.

Liquid concentrate splits the difference but needs mixing with water. Bring bottled water or ask the crew.

Water for mixing

Airplane tap water is not great. It comes from the plane’s water tank and varies in quality. Ask the cabin crew for bottled water, or bring your own sealed bottles (water for baby formula is also exempt from liquid restrictions at most airports, but this varies, so keep it with your formula when going through security).

At your destination, check whether tap water is safe for formula preparation. Many popular travel destinations have unsafe tap water. Use our Destinations checker to look up water safety for your country.

How much to bring

A rough guide:

If you’re going somewhere with limited formula availability (check our country pages), consider packing enough for the first few days. Some brands aren’t available everywhere.

Formula at your destination

This is the part parents don’t think about until they’re there. US brands (Similac, Enfamil) are not available in most of Europe or Asia. European brands (Aptamil, HiPP) are not available in the US. Australian brands are different again.

If your baby is particular about a brand or has dietary needs (hypoallergenic, soy-based, etc.), bring enough from home or research what’s available at your destination before you go.

Check formula availability for any country in our Destinations section.