The scoop
Most U.S. airlines let children under two fly free as a lap infant on domestic flights. International trips usually cost 10% of the adult fare plus taxes, though JetBlue and Southwest charge only taxes and fees.
The FAA says the safest place for a child under two is in an approved car seat in their own seat, not on a lap, so weigh the savings against safety on longer trips. Our flying-with-a-baby guide compares each airline's rules.
How to claim it
- 1
Add a lap infant when booking or call the airline.
- 2
Bring a birth certificate or other proof of age. Southwest requires an original or photocopy, not a phone photo.
Who qualifies
- Children under 2
- Domestic flights
- Airline policies vary