Plan to arrive at IAH 2h 15m before a domestic flight or 3h 15m for international. TSA lines average ~25 minutes and 79% of flights depart on time. Fastest through security: 4 AM (5 min).
How Early Should I Get to IAH?
George Bush Intercontinental — Houston
Recommended Arrival
2h 15m
before a domestic flight
3h 15m for international
~25m
TSA wait
30m
Check-in & bag drop
79%
On time
76m
Avg delay
Best & worst times through security
Fastest
4 AM (5 min)
Busiest
6 PM (22-28 minutes)
Wait times are similar throughout the week.
Terminal info at IAH
Terminals: Terminal A (United), Terminal B (United), Terminal C (United international), Terminal D (International), Terminal E (Other airlines)
Getting around: Skyway automated train connects Terminals A, B, C, and E. Terminal D connected via walkway from C.
Transit time: 5-10 minutes between most terminals via Skyway
Re-screening: No re-screening needed between terminals. All terminals are connected post-security via the Skyway train system. International arrivals in Terminals C and D can connect to domestic flights without re-screening.
Tips for arriving at IAH
- →Morning flights are best — less delay risk, shorter TSA lines, calmer weather.
- →Check in online — skip the counter and go straight to security with a mobile boarding pass.
- →TSA PreCheck saves time — typically 5-10 minutes vs. standard lanes. $78 for 5 years.
- →Holidays need more buffer — add 30-45 minutes around Thanksgiving, Christmas, and summer peaks.
Common questions
How early should I get to George Bush Intercontinental (IAH) for a domestic flight?
We recommend arriving at IAH 2h 15m before your domestic flight. TSA wait times at IAH average around 25 minutes, and the airport has an on-time departure rate of 79%. The fastest time through security is 4 AM (5 min). Add extra time if you're checking bags or traveling during peak hours.
How early should I get to IAH for an international flight?
For international flights from IAH, arrive 3h 15m before departure. International check-in counters close 60 minutes before departure, and you may need extra time for passport control and security screening. Airlines recommend 3 hours for international departures.
What is the best time to go through security at IAH?
The fastest time through TSA at IAH is 4 AM (5 min). The busiest time is 6 PM (22-28 minutes). Wait times are similar throughout the week.
Does TSA PreCheck help at IAH?
Yes. TSA PreCheck lanes at IAH are significantly faster — typically 5-10 minutes vs. the standard line. PreCheck members keep shoes, belts, and light jackets on and leave laptops in bags. If you fly more than twice a year, PreCheck ($78 for 5 years) pays for itself quickly.
How long are TSA wait times at IAH?
TSA wait times at IAH are currently around about 22-28 minutes. Fastest: 4 AM (5 min). Busiest: 6 PM (22-28 minutes).