When Can A Baby Travel By Plane?

The Short Answer

Most airlines allow babies to fly at just 2 to 7 days old. There's no federal law in the U.S. that sets a minimum age for air travel. Each airline makes its own rules, and they vary — some let 2-day-old newborns fly with a doctor's note, while others won't accept babies under 7 days old at all.

Pediatricians generally recommend waiting until your baby is 2 to 3 months old if possible. Not because flying is inherently dangerous for newborns, but because their immune systems are still developing and airports are germ factories.

Minimum Age By Airline

Here's what each major U.S. airline requires:

• American Airlines: Babies as young as 2 days old can fly. Infants under 7 days need a medical authorization form completed by a physician
• Delta: Babies under 7 days old need a physician's approval letter to fly
• United: Infants younger than 7 days old are not accepted at all
• Southwest: Requires a medical release for any infant under 14 days old
• Alaska Airlines: No official minimum age, but recommends checking with your pediatrician
• JetBlue: Babies must be at least 3 days old
• Spirit: Infants under 7 days old are not accepted
• Frontier: Infants must be at least 7 days old

If your baby is under 2 weeks old, call the airline directly before booking. Policies can change, and you don't want to find out at the gate that your newborn can't fly.

What Pediatricians Actually Say

The American Academy of Pediatrics doesn't have a strict rule against newborn air travel, but most pediatricians recommend waiting if you can. Here's their reasoning:

Immune system concerns

Newborns have immature immune systems for the first 2 to 3 months. Airplanes recirculate cabin air (though modern planes use HEPA filters), and airports expose your baby to crowds from around the world. A fever in a baby under 2 months old typically means an ER visit and potentially invasive testing. That's reason enough to wait if your trip is optional.

When it's medically okay

Most healthy, full-term babies can technically fly at any age. Premature babies or those with respiratory or heart conditions should get specific clearance from their pediatrician. If your baby was in the NICU, ask their doctor about altitude and cabin pressure effects before booking.

The practical threshold

By 2 to 3 months, your baby has had their first round of vaccinations, their immune system is stronger, and you've had enough time to establish feeding and sleep patterns. Flying before this is possible — just riskier and harder.

Lap Infant vs. Buying A Seat

Babies under 2 years old can fly as "lap infants" on domestic U.S. flights for free. That means your baby sits on your lap for the duration of the flight. No ticket required.

Here's the breakdown:

• Domestic flights: Lap infants fly free on all major U.S. airlines
• International flights: Lap infants typically pay 10% of the adult fare
• One lap infant per adult: FAA rules limit one lap-held infant per adult passenger. If you're traveling with twins, one adult per baby is required, or you'll need to buy a separate seat

Should you buy a separate seat?

The FAA and AAP both recommend purchasing a separate seat for your baby and using an FAA-approved car seat. A lap infant has no restraint during turbulence or an emergency. An infant in a properly installed car seat is significantly safer.

That said, buying an extra seat doubles your ticket cost. Many parents use the lap option for shorter flights and buy a seat for longer trips or turbulence-prone routes.

What You'll Need To Bring

Flying with a baby requires more gear than you'd think. Here's the essential checklist:

Documents

• Proof of age: Airlines may ask for a birth certificate or passport for lap infants, especially on international flights. Bring it even for domestic flights
• Medical clearance: If your baby is under 14 days old, bring the doctor's note or medical form required by your airline
• Boarding pass: Lap infants don't get their own boarding pass on most airlines. Your boarding pass will note the infant

Feeding supplies

• Bottles, formula, or breast milk (exempt from the TSA 3-1-1 rule — bring as much as you need)
• Nursing cover if you prefer one
• Pacifier (helps with ear pressure)
• Burp cloths

Diaper supplies

• Diapers — at least one per hour of travel, plus extras
• Wipes
• Changing pad
• Plastic bags for dirty diapers
• A complete change of clothes for baby (and a spare shirt for you)

Comfort items

• Lightweight blanket
• A familiar toy or comfort object
• Baby carrier or wrap for hands-free walking through the airport

Managing Ear Pressure

Babies can't pop their ears the way adults do. The pressure changes during takeoff and descent can be uncomfortable or painful, and your baby will let you know by crying. Here's how to help:

• Feed during takeoff and landing. Sucking and swallowing naturally equalize ear pressure. Time a bottle or nursing session to start right as the plane begins its ascent or descent
• Offer a pacifier. If your baby isn't hungry, a pacifier gives them something to suck on. Same principle — the swallowing motion helps
• Keep baby upright. An upright or semi-upright position helps with pressure equalization and prevents reflux
• Avoid flying with a cold or ear infection. Congestion makes ear pressure much worse. If your baby is congested, talk to your pediatrician about whether to fly or postpone. They may recommend saline drops before the flight

Start the feeding about 3 to 4 minutes after takeoff. For landing, begin about 30 minutes before touchdown — the descent is typically longer and more gradual than the climb.

Booking Tips For Flying With A Baby

A few strategic decisions can make the whole experience easier:

• Book direct flights. Every connection doubles the stress and adds risk of delays, missed flights, and lost bags. A direct flight means one takeoff, one landing, and you're done
• Choose off-peak flights. Midweek flights and early morning or late evening departures tend to be less crowded. More empty seats mean more room — and possibly an empty seat next to you for baby
• Request a bassinet on long-haul flights. Many international carriers offer bassinets that attach to the bulkhead wall. Request one when booking — they're limited and go fast
• Pick the right seat. Aisle seats give you easy access to the lavatory. Bulkhead seats give you more legroom and no seat in front to worry about. Window seats give you a wall to lean against while nursing
• Board early if offered. Most airlines offer pre-boarding for families with small children. Take it. You'll have time to get set up before the crowd boards

Flying With A Premature Baby

Premature babies need extra consideration before flying:

• Get specific medical clearance. Preemies may have underdeveloped lungs that are more sensitive to cabin pressure and lower oxygen levels at altitude
• Wait longer. Many pediatricians recommend waiting until a preemie reaches their original due date before flying, not their actual birth date
• Bring medical records. If your baby has any ongoing health conditions from prematurity, carry relevant medical documents
• Consider supplemental oxygen. In rare cases, a doctor may recommend portable oxygen for a preemie on a flight. This requires advance coordination with the airline

What About Cabin Pressure And Altitude?

Airplane cabins are pressurized to the equivalent of 6,000 to 8,000 feet above sea level. This means slightly lower oxygen levels and lower air pressure than on the ground. For healthy, full-term babies, this is completely safe.

The main effects on babies:

• Ear discomfort during pressure changes (managed by feeding or pacifier)
• Slightly drier air that can cause mild dehydration. Feed your baby more frequently during the flight
• Gas expansion — air in the stomach expands at altitude, which can make babies gassy and fussy. Burp your baby more often in-flight

The Bottom Line

Your baby can technically fly within days of being born — most airlines allow it from 2 to 7 days old. But if you have the flexibility, waiting until 2 to 3 months gives your baby a stronger immune system and gives you time to figure out feeding, sleeping, and diaper routines before adding air travel to the mix. When you do fly, feed during takeoff and landing, pack twice what you think you'll need, and book the simplest itinerary you can find.