Most pediatricians believe that a 4- to 6-week-old baby can handle airplane flights. But this guidance only refers to babies with no health complications who get the go-ahead from a pediatrician. Premature infants, as well as those with respiratory or other health issues, may fare better on the ground.

There is no "official" minimum age for a child to start flying; most airlines allow infants as young as two days old to board a domestic flight, though many pediatricians recommend waiting until the baby is at least two to four weeks old. This waiting period allows the infant's immune system to develop slightly and ensures that any potential ear-pressure issues can be managed. By age two, a child is no longer considered a "lap infant" and must have their own purchased seat. In 2026, "Unaccompanied Minor" (UM) services typically begin at age five, allowing children to fly alone under the supervision of airline staff. By age 12, most airlines transition a child to an "Adult" fare, though they can still be supervised upon request. For 2026 parents, the most important factor isn't just the age, but the child's ability to "equalize" their ear pressure during takeoff and landing; feeding a baby or giving a toddler a snack during these times is a vital "pro" tip to prevent the pain and crying often associated with early air travel.