How early should I get to a major US airport, and what should I do before I leave home?

Summary

The steps

1. 1

   24 hours out: complete online check-in

   Most airlines open online check-in 24 hours before departure. Log in to your airline’s app or website, confirm your seat, and download or save your boarding pass. Verify that the name on your ticket exactly matches the name on your ID — a mismatch can cause delays at the counter or checkpoint.

   Airlines set their own check-in and bag-drop cut-offs. These deadlines are firm: miss them and you may not be able to board even if you arrive at the airport on time. Confirm your airline’s specific cut-offs when you check in online.

   Do this

   Open your airline’s app or website and complete check-in as soon as the window opens.,Download or screenshot your boarding pass so it is accessible offline.,Confirm the name on your ticket matches your ID exactly.,Note your airline’s bag-drop cut-off time and build it into your departure plan.

   Example

   If your airline’s bag-drop cut-off is 45 minutes before departure and your flight is at 8:00 a.m., you need to be at the counter by 7:15 a.m. — which means clearing security before that, which means arriving well before 7:15 a.m.

   Best practice

   Check in the moment the window opens. Boarding passes in an airline app update automatically if your gate or flight changes; a printed pass does not.
2. 2

   24 hours out: confirm your ID is accepted at the TSA checkpoint

   REAL ID enforcement at TSA checkpoints began May 7, 2025. A compliant card carries a star marking in the upper corner.

   If your state ID is not REAL ID-compliant, TSA accepts several alternative documents: a US passport, passport card, or a DHS trusted-traveler card such as a Global Entry card. The full current list is published at tsa.gov/travel/security-screening/identification — check it before you travel.

   If you have no acceptable ID, TSA offers ConfirmID — a paid identity-verification service ($45, processed through Pay.gov, covering a 10-day travel period) — but verification is not guaranteed. Plan ahead; do not rely on this as a same-day solution.

   For packing guidance, see the TSA carry-on packing guide.

   Do this

   Check your state ID or driver’s license for the REAL ID star marking.,If your ID is not REAL ID-compliant, locate your US passport, passport card, or DHS trusted-traveler card.,Visit tsa.gov/realid to confirm your state’s compliance status and the current accepted ID list.,Pack your ID in a consistent, accessible place — not buried in checked luggage.

   Example

   A traveler whose state recently issued REAL ID-compliant licenses may still carry an older non-compliant card. Checking the star marking the night before avoids a last-minute scramble for a passport.

   Best practice

   Keep your travel ID in the same pocket or slot every trip. Never pack your only accepted ID in a checked bag.
3. 3

   Evening before: check your flight status and gate

   Open your airline’s app or website the evening before departure and confirm your flight is operating, your departure time, and your assigned gate. Gates at large hub airports are subject to change, sometimes multiple times before boarding.

   For airport-wide conditions — ground stops, ground delay programs, or closures — check FAA Airport Status at fly.faa.gov. It shows general conditions across US airports; it does not show individual flight information.

   Do this

   Open your airline’s app and confirm flight status, departure time, and gate.,Enable push notifications from your airline app so gate or time changes reach you automatically.,Check FAA Airport Status at fly.faa.gov for any system-wide conditions at your departure airport.,Note the terminal and gate so you know where to head when you arrive.

   Example

   A ground delay program at a hub airport may not cancel your flight but will push your departure back. Seeing it the evening before lets you adjust your morning schedule rather than discovering it at the airport.

   Best practice

   Check flight status again on the morning of travel. Conditions change overnight, especially during weather events.
4. 4

   Morning of: decide when to leave — use the 2-hour / 3-hour rule

   TSA recommends arriving at least 2 hours before a domestic flight and at least 3 hours before an international flight at major US airports. These are minimums, not targets. At large hub airports during peak periods — early mornings, holidays, and long weekends — security lines can extend well beyond what the minimum allows.

   Hartsfield-Jackson Atlanta International Airport (ATL) gives travelers the same 2-hour/3-hour guidance and notes that its busiest checkpoint periods are typically 5–9 a.m. and around holidays and long weekends. ATL publishes live TSA wait times at atl.com/times.

   Work backward from your airline’s bag-drop cut-off, not from your departure time, to set your leave-home time. Confirm the recommended arrival time with your airline.

   Do this

   Identify your airline’s bag-drop cut-off and count backward to set your target airport arrival time.,Add buffer for your airport’s peak period if your flight falls in an early-morning or holiday window.,Check live wait times where your airport publishes them (ATL: atl.com/times) before you leave.,Leave home with enough margin that a moderate traffic delay does not make you late.

   Example

   For an 8:00 a.m. domestic departure from a large hub, a 5:45–6:00 a.m. airport arrival gives you roughly 2 hours before departure and keeps you ahead of the busiest checkpoint period.

   Best practice

   The 2-hour and 3-hour recommendations assume normal conditions. Add extra buffer during peak travel periods or if you are checking bags.
5. 5

   At the airport: navigate to your checkpoint and clear security

   Follow signs for your airline’s terminal or the terminal shown on your boarding pass. At large hub airports, terminals may be connected by train, walkway, or shuttle — allow time for this if your check-in counter and security checkpoint are not in the same building as your gate.

   Have your boarding pass (digital or printed) and your accepted ID ready before you reach the front of the security line. Separate your carry-on liquids and electronics as required — for a full checklist of what to prepare at the checkpoint, see the TSA carry-on packing guide.

   Do this

   Check your boarding pass for the correct terminal and gate before entering the airport.,Follow terminal signs and allow time for inter-terminal transit if needed.,Have your ID and boarding pass accessible before joining the security queue.,Prepare your carry-on for screening before you reach the belt.

   Example

   At a large hub with multiple concourses, your check-in counter may be in a different concourse from your gate. Clearing security in the right terminal saves backtracking.

   Best practice

   Wear slip-on shoes and avoid a belt if possible — small things that slow the screening process add up when lines are long.
6. 6

   After security: confirm your gate and monitor for changes

   Once you are through security, check the departure board nearest to you and cross-reference with your airline’s app to confirm your gate. At large hub airports, gates can change after you have cleared security — sometimes to a different concourse.

   Keep your airline app open or notifications enabled. If a gate change is announced, verify it through both the app and a departure board before moving — a single notification can occasionally contain an error that is quickly corrected.

   Do this

   Check the departure board immediately after clearing security to confirm your gate.,Cross-reference with your airline app.,Keep notifications enabled and recheck the app and boards 30–45 minutes before boarding.,If a gate change sends you to a different concourse, allow time for the transit.

   Example

   A gate change from one end of a large hub to another can mean a 15-minute walk or a train ride. Catching it early — rather than at boarding time — removes the stress.

   Best practice

   Sit within sight of a departure board or set a phone reminder to recheck your gate 40 minutes before scheduled boarding.
7. 7

   Boarding: be at the gate before boarding begins

   Airlines set their own boarding and door-closing times, so check yours in the app. Arriving at the gate after door closure — even with a valid boarding pass — typically means you will not board, and your checked bags may be offloaded.

   If you are in a lounge or a distant part of the terminal, set a reminder to begin walking to your gate with enough time to account for distance and any last-minute gate change.

   Do this

   Be at your gate at least 30 minutes before scheduled departure.,Set a phone reminder if you plan to be in a lounge or away from the gate area.,Confirm the gate one final time on the departure board as you approach.,Have your boarding pass ready to scan before joining the boarding queue.

   Example

   A traveler in an airport lounge who sets a ‘leave by’ reminder 45 minutes before departure avoids the risk of missing boarding because of distance or a last-minute gate change.

   Best practice

   Earlier boarding groups often mean better overhead bin space. Check your boarding group on your pass and listen for announcements.

Why departure-day timing matters more at a hub airport

T-minus timeline: from 24 hours before departure to boarding

What this guide does not cover

About Airport Online

FAQ

How early should I arrive at a major US hub airport for a domestic flight?

TSA recommends arriving at least 2 hours before your domestic departure. At large hub airports, security lines can be significantly longer during peak periods — early mornings, holidays, and long weekends. Hartsfield-Jackson Atlanta International (ATL), for example, typically sees its busiest checkpoint periods between 5 and 9 a.m. Always confirm the recommended arrival time with your airline, as bag-drop cut-offs may require you to arrive even earlier.

How early should I arrive for an international flight from a US hub airport?

TSA recommends at least 3 hours before an international departure. International check-in and bag-drop cut-offs are typically earlier than for domestic flights, and document checks add time at the counter. Confirm the exact cut-off with your airline before departure day, as requirements vary by carrier and destination.

What ID do I need at a TSA security checkpoint after REAL ID enforcement began?

REAL ID enforcement at TSA checkpoints began May 7, 2025. You need either a REAL ID-compliant state driver's license or ID card, or another accepted document such as a US passport, passport card, or a DHS trusted-traveler card like a Global Entry card. The full current list is at tsa.gov/travel/security-screening/identification.

What should I do if my gate changes after I've cleared security?

Open your airline's app first — gate changes are usually pushed as notifications and reflected in the app before departure boards update. Then check the nearest departure board to confirm. At large hub airports, gate changes can mean a significant walk or even a terminal change, so act promptly. Do not rely on a single notification; verify through at least two sources before settling at a new gate.

Where can I check for airport-wide delays or ground stops on departure day?

FAA Airport Status (fly.faa.gov) shows general airport conditions including ground stops, ground delay programs, and closures across US airports. It does not show flight-specific information — use your airline's app or website for your individual flight status and gate. Check both on the morning of travel.