Lap babies (younger than age 2) fly free on domestic flights, usually one per paying adult. (You may need to present proof of age.) This does save you money, but it's important to note that babies riding in airplanes are safest riding in government-approved car seats.

Do babies under two fly free?

Babies age two and under can fly free on domestic U.S. flights with one paying passenger as long as they sit in the passenger's lap. It is safer for a child to ride in a car seat in the plane, and if you prefer that option, you'll need to pay full fare for a seat for the baby regardless of age.

Do babies need plane tickets?

Yes, even though airlines don't require parents to buy tickets for children under 2 years of age. If you don't buy a ticket for your child, you can't be sure she'll have a seat — and she might end up sitting on your lap. ... The safest way for your child to travel is secured in a car seat strapped into the airline seat.