Traveling with a little one? United Airlines has made it easy to add your infant to your flight ticket. Little ones aged two years old can fly for free as long as they are held in a lap/infant seat. It's important that you notify United about your infant when booking your ticket. You'll need to prov

Traveling with your little one on a United Airlines flight? It's easy to include an infant to your ticket. Infants under two usually fly for free as long as they don't occupy their own seat. You'll need to inform United Airlines about your traveling infant during the booking step. To confirm a smoo