The Documents and ID You Need at the Airport

To board a domestic flight in the United States, you need one piece of government-issued photo ID. A driver's license, state ID card, or passport all work. If you don't have a driver's license, a passport card counts. Military ID also works. You do not need a passport for flights within the US — that's only for international travel.

Your ID must not be expired. The TSA (Transportation Security Administration) checks the expiration date, and an expired ID will stop you at security, even if it's only expired by a day. If your ID is expired, you'll need to get a new one before you fly — most states can issue a replacement driver's license in one to two weeks if you go in person.

You also need your airline ticket or boarding pass. Most people check in online 24 hours before departure and get a digital boarding pass on their phone. You can also print a paper boarding pass at home or get one at the airport ticket counter. Either way, you'll show it at security and again at the gate.

Key Takeaways

  • You need one government-issued photo ID (driver's license, state ID, passport, or military ID) that is not expired.
  • Your boarding pass can be digital on your phone, printed at home, or printed at the airport — all three work the same way.
  • You do not need a passport for domestic flights; a regular driver's license is enough.
  • TSA PreCheck and Real ID are optional programs that speed up security but are not required to fly.
  • Arrive at the airport at least two hours before a domestic flight so you have time to check in, go through security, and reach your gate.

What Happens at Security and the Gate

When you arrive at the airport, go to the airline ticket counter or use a self-service kiosk to check in. You'll show your ID and boarding pass. The airline scans your boarding pass and checks your name against the passenger list. If you're checking a bag, you'll drop it at the counter or on a conveyor belt. If you're only carrying on a bag, you can skip the counter and go straight to security.

At the TSA security checkpoint, you'll stand in line with your ID and boarding pass ready. A TSA officer will look at both documents and compare your face to your ID photo. You'll then walk through a metal detector or body scanner. You'll need to remove your shoes, belt, and jacket, and put them in a bin along with your phone, keys, and wallet. Liquids (including gels and creams) must be in containers of 3.4 ounces or smaller and packed in a single clear plastic bag.

After security, you'll walk to your gate. Your boarding pass shows the gate number, though gates sometimes change — check the screens in the terminal. At the gate, you'll show your boarding pass again before boarding the plane. Once you're on the plane, you can stow your carry-on bag and sit down.

Real ID and TSA PreCheck: What They Are and Whether You Need Them

Real ID is a federal standard for state-issued ID cards and driver's licenses. Most states now issue Real ID compliant licenses, but some still issue older licenses that don't meet the standard. A Real ID license has a small star or marking in the top right corner. You do not need a Real ID to fly domestically — a regular driver's license works fine. Real ID becomes relevant only if you want to enter a federal building or military base without a passport.

TSA PreCheck is an optional paid program that costs $78 to $85 for five years. If you enroll, you can go through a faster security line at most major airports. You keep your shoes, belt, and light jacket on, and you can leave your laptop and liquids bag in your carry-on. You still show your ID and boarding pass. TSA PreCheck is convenient if you fly several times a year, but it's not required — the regular security line works just fine.

Neither program is necessary to fly. Both are optional ways to make the process faster or easier. If you fly rarely, a regular ID is all you need.

What You Can and Cannot Bring in Your Carry-On Bag

You can bring one carry-on bag and one personal item (a purse, backpack, or laptop bag) on the plane. The carry-on bag must fit in the overhead bin, and the personal item must fit under the seat in front of you. Most airlines have size limits — typically 22 inches long, 14 inches wide, and 9 inches deep for a carry-on — but they're not always strictly enforced.

Liquids, gels, and creams must follow the 3-1-1 rule: containers of 3.4 ounces or smaller, all in one clear plastic quart-sized bag, one bag per person. This includes toothpaste, shampoo, conditioner, lotion, sunscreen, peanut butter, yogurt, and jam. Solid items like deodorant sticks, solid perfume, and lipstick are allowed without limits. Medications in liquid or gel form are allowed if they're in their original labeled container.

You cannot bring sharp objects (knives, box cutters, razors), firearms, ammunition, or flammable items. You can bring a lighter (one) but not lighter fluid. Tools longer than 7 inches are not allowed. If you're unsure whether something is allowed, check the TSA website or call the airline before you pack.

What You Can Check in a Bag

If you check a bag, the rules are much looser. You can pack liquids, gels, and creams in any amount. You can pack tools, a small toolkit, or a hammer. You can pack a lighter (one) and lighter fluid. You cannot pack firearms or ammunition unless you follow specific rules — firearms must be unloaded, in a locked hard-sided container, and declared to the airline at check-in. Ammunition must also be in a locked container and declared.

Checked bags cost money on most airlines. The first checked bag usually costs $30 to $35 on a major carrier, though some airlines include one free checked bag if you have a premium ticket or credit card. Bags that are overweight (usually over 50 pounds) or oversized cost extra. Weigh and measure your bag before you go to the airport so you know what to expect.

The airline will tag your bag and send it down a conveyor belt. It will be loaded onto the plane in the cargo hold. When you land, you'll pick it up at baggage claim — a carousel where bags come around on a moving belt. If your bag doesn't arrive, tell the airline when ready.

Timing: When to Arrive and How Long Everything Takes

Arrive at the airport at least two hours before a domestic flight. This gives you time to find the right terminal, check in, go through security, and walk to your gate without rushing. If the airport is very busy or you're unfamiliar with it, arriving 2.5 hours early is safer.

Check-in usually takes 5 to 10 minutes if you use a kiosk or check in online. Security takes 15 to 45 minutes depending on how busy the checkpoint is. Early morning and late evening are usually quieter. Mid-morning and afternoon are busier. Walking to your gate takes 5 to 15 minutes depending on the airport layout.

Boarding starts 30 to 45 minutes before departure. You don't have to board when ready — you can wait until they call your group. The flight departs on time or slightly late. Once the doors close, no one else can board, so be at your gate before that happens.

Special Situations: Minors, Expired ID, and Lost Documents

Children under 18 do not need an ID to fly domestically if they're traveling with an adult. The adult needs an ID, but the child does not. If a child is traveling alone or with someone who is not a parent or legal guardian, the situation is more complex — call the airline ahead of time to ask what documents you need.

If your ID is expired, you cannot fly. You'll be turned away at security. Get a new ID before your flight. If your flight is soon and you can't get a new ID in time, you may be able to cancel or reschedule your flight without a penalty — check your airline's policy.

If you lose your ID on the day of your flight, go to the airline ticket counter when ready. TSA officers can sometimes verify your identity using other documents (a credit card, Social Security card, or birth certificate) and let you through security, but this is not may provide. It's faster and safer to get a replacement ID before you fly.

Frequently Asked Questions

Can I use a passport card instead of a driver's license?

Yes. A passport card is a government-issued photo ID and works just like a driver's license at security and the gate. It must not be expired. A regular passport book also works.

What if I don't have a driver's license or passport?

You can get a state ID card from your state's DMV (Department of Motor Vehicles). It's not a driver's license — it's just an ID card for people who don't drive. It costs $10 to $30 depending on your state and takes one to two weeks if you explore in person. Bring proof of identity (birth certificate, Social Security card) and proof of address (utility bill, lease).

Do I need to print my boarding pass or can I just show it on my phone?

A digital boarding pass on your phone works fine. You don't need to print it. Just open the airline's app or your email and show the barcode to the TSA officer and gate agent. Make sure your phone is charged.

Can I bring a vape or e-cigarette on a plane?

Vaping devices are allowed in carry-on bags only, not in checked bags. The battery can overheat in the cargo hold. You cannot use it on the plane — smoking and vaping are banned on all US flights.

What happens if I miss my flight?

If you miss your flight, contact the airline when ready. Most airlines will rebook you on the next available flight at no extra charge if you miss the flight due to a delay outside your control (traffic, security line). If you straightforward arrive late, you may have to buy a new ticket or pay a change fee. Check your airline's policy before you fly.