With Uber, all pickups are made on demand and drivers arrive within minutes, so there’s no need to schedule a ride in advance.
The app will show you approximately how far away the closest driver is so you can request your pickup at a time that fits your schedule.
Leaving for an early flight? Open your Uber app about 10-15 minutes before you’d like to be picked up so you can gauge the current ETA to your location. Then you can request your ride accordingly.