Originally Posted by Kensterfly

UA domestic flights can go out of three terminals. B, C, and E. Check-in at E is currently closed for construction. Which means you have to check in/ go through security at B or C.
The logistics depend on where your outbound gate is. The last time I flew out of IAH, I entered at Terminal B, cleared security, and took the airside sky train to E for my flight.
T-C can be a real mess with T-E check-in and TSA shut down.
So, regardless of where your plane is departing from, I’d make sure I’m in T-B a minimum of an hour before departure. A little longer if your flight is departing from C or E.