How early should I get to IAH?
Be at IAH two hours before a domestic departure and three before an international one.
Be at IAH two hours before a domestic departure and three before an international one.
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A maps app covers the drive to IAH. Bag drop, security, and the walk to your gate usually take longer, and they are the steps people misjudge.
Here is the same plan drawn to scale. The first block is travel; the next two are the airport. A checked bag grows one, a far gate grows the other.
Front door to boarding: 2hr 40min
Be at IAH two hours before a domestic departure and three before an international one. That is a solid default here. Trim it only on routes and hours you already know well.
IAH is well north of the city and most of Houston is a long, traffic-dependent drive away, so budget the road generously. Five terminals share the field, and while the trains reach all of them, the terminal still decides which entrance and which garage you want.
Five terminals with linked airside trains mean the checkpoint you use depends on your airline; United's operation dominates and its peaks follow the connection banks. Two separate train systems run here (the Skyway after security and the Subway before it), so which one you need depends on whether you have been screened yet.
The plan allows 25 minutes for a standard lane on a busy but normal morning. With TSA PreCheck, that drops to 15 minutes. A checked bag lengthens the one before it.
From most of Houston it's US-59 or I-45 plus the airport loop. There's no rail link, so build rush-hour traffic into the drive estimate, and give the parking shuttle its own slot in the plan. METRO runs a nonstop Downtown Direct bus, which at least removes the parking step even if it cannot remove the traffic.
For live waits, parking, and terminal maps, check the official IAH site.
Terminals, checkpoints and transit change; the official IAH site is the live source.
Be at IAH two hours before a domestic departure and three before an international one. That is a solid default here. Trim it only on routes and hours you already know well. The plan above works back from there through security, bag drop, parking and the drive to a leave-by time.
The plan allows 25 minutes for a busy-but-normal standard lane. With TSA PreCheck it drops to 15 minutes, and you can edit either one to what you actually see. A checked bag lengthens the step before it. Checkpoint detail for IAH is under Security at IAH above.
Earlier than for a domestic one. International boarding starts 45 minutes before departure instead of 30, which pulls every step earlier. Use the airline desk for bags: documents get checked and counters often close an hour out. That also covers lap infants, unaccompanied minors, and oversized bags. If your boarding pass names a boarding time, match that.
Work backward from departure: boarding, time at the gate, the walk, security, bag drop, parking, then the drive (35 minutes in the default plan). Replace the drive with your own route. The leave-by moment is the first travel row, "Drive to IAH" by default.
Taking the train instead? The Amtrak station pages use the same kind of plan without security. Flying from somewhere not listed? The airport leave time calculator has the same rows with your own numbers, and the wake-up time calculator runs it back to the alarm.
Start the plan in the app, and the Lock Screen and Dynamic Island show the time left, with a bar that fills as each step passes.
Glance at it in the terminal without opening the app.
Every step also gets its own alert, and sharing the plan gives whoever is driving the same leave time, with alerts on their phone.
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Ready Time
You know what you need to do. Ready Time helps you know when to start.
Plans for the rest of the trip
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