Undocumented immigrants can travel within the US, but every mode of transportation carries real risk, and those risks have grown sharply since early 2025. Flying requires an ID that satisfies the TSA. Driving exposes you to traffic stops. Buses and trains can be boarded by immigration agents. And roughly two-thirds of the country sits inside a federal “border zone” where Border Patrol runs permanent interior checkpoints. What follows is what actually works, where the risk concentrates, and the rights you keep in any encounter.
Flying Domestically
Every passenger 18 or older needs a valid photo ID to clear a TSA checkpoint.1Transportation Security Administration. Acceptable Identification at the TSA Checkpoint TSA’s mission is transportation security, not immigration enforcement, but that distinction is thinner than it sounds. If an agent cannot verify your identity, the situation can escalate.
The most reliable document for an undocumented traveler is a valid, unexpired passport from your country of origin. TSA accepts foreign passports for domestic flights. An Employment Authorization Document (EAD, Form I-766) also works.1Transportation Security Administration. Acceptable Identification at the TSA Checkpoint Consular ID cards and municipal IDs are not on TSA’s list, so neither will get you through.
The REAL ID Wall
Since May 7, 2025, any state driver’s license or ID card used to board a domestic flight has to be REAL ID-compliant, marked with a star or flag in the corner.2Transportation Security Administration. TSA Reminds Public of REAL ID Enforcement Deadline of May 7, 2025 REAL ID requires proof of lawful status, so it isn’t available to undocumented individuals. A standard state license without the star will not work at the checkpoint, even if the state issued it to you legally. You would need a foreign passport or another document from TSA’s accepted list.3Transportation Security Administration. REAL ID
Showing Up Without Accepted ID
TSA runs a paid service called ConfirmID for travelers without acceptable identification. You pay $45, provide your legal name, address, and date of birth, and TSA attempts to verify your identity through its databases.4Transportation Security Administration. TSA ConfirmID There is no guarantee it works. When identity verification fails, TSA may contact Customs and Border Protection or ICE. That possibility makes flying without proper ID genuinely dangerous, particularly at airports near international borders where federal immigration agents already have a presence.
Driving, Buses, and Trains
Ground travel involves fewer formal ID checks than flying. The risks are less predictable instead.
Driving Yourself
You don’t have to show identification just to cross a state line. The exposure comes from routine traffic stops. Speeding, a broken taillight, any moving violation, and an officer will ask for a license and registration. Driving without a valid license can bring a citation or arrest, and any law enforcement encounter can turn into an immigration one. Roughly 19 states and the District of Columbia issue driver’s licenses to residents regardless of immigration status, so whether you can drive legally depends heavily on where you live. Those licenses are valid for driving but will not get you on a plane.
Where you drive matters too. In states and cities that limit cooperation with federal immigration authorities, local police are less likely to ask about status or notify ICE after a routine stop. The federal government has designated roughly a dozen states as “sanctuary jurisdictions” based on policies restricting information-sharing with immigration agencies.5U.S. Department of Justice. U.S. Sanctuary Jurisdiction List Following Executive Order 14287 Elsewhere, local police may cooperate closely with ICE. That unevenness is one of the hardest parts of assessing ground risk.
Buses and Trains
Interstate carriers set their own ID practices. Greyhound lets you board by showing a photo ID to the driver with a booking confirmation.6Greyhound. Tips for Your Journey and FAQs Amtrak advises passengers to carry ID and may ask for it at boarding or during the trip.
The bigger concern on buses and trains is not the carrier’s own rules. It is the possibility of immigration agents boarding to run checks, especially on routes passing through or near the 100-mile border zone below. Passengers are not required to answer questions about citizenship or status during those encounters, but the situation can feel coercive when agents are walking the aisle asking each person where they were born.
The 100-Mile Border Zone
Customs and Border Protection operates permanent interior checkpoints on major highways, and they aren’t limited to the actual border. Federal law lets immigration officers stop and question people without a warrant within a “reasonable distance” of any external boundary.7Office of the Law Revision Counsel. 8 USC 1357 – Powers of Immigration Officers and Employees Federal regulations define that distance as 100 air miles from any land or coastal border.8eCFR. 8 CFR 287.1 – Definitions Because the zone includes the entire coastline, it covers most major U.S. cities and about two-thirds of the country’s population.
The Supreme Court held in United States v. Martinez-Fuerte that Border Patrol agents at fixed checkpoints can stop vehicles and briefly question occupants about citizenship without any individualized suspicion.9Legal Information Institute. United States v. Martinez-Fuerte Agents can also send a vehicle to secondary inspection without needing a specific reason for that particular car.
At a checkpoint you will be asked basic citizenship questions. You aren’t legally required to answer, but refusing will likely land you in secondary inspection. Stay calm, don’t volunteer information beyond what is asked, and never present false documents. If you are traveling by bus through a checkpoint area, the bus will stop and agents may board to question passengers one by one.
What Changed in 2025
The practical risk of traveling while undocumented has climbed sharply since January 2025. Federal enforcement has expanded well beyond the border into the interior, with ICE running more operations in communities, workplaces, and public spaces than in recent years.
One change matters most. The longstanding “sensitive locations” policy that had restricted immigration enforcement at schools, hospitals, and houses of worship was rescinded in January 2025.10U.S. Immigration and Customs Enforcement. Protected Areas and Courthouse Arrests It was replaced with a directive giving ICE leadership case-by-case discretion. A court order has since partially restored protections for places of worship, but the framework is far more permissive than before 2025. Transportation hubs are not specifically protected under any current directive. Airports, bus stations, and train depots are all places you could encounter immigration agents.
Your Rights During a Stop
The Constitution protects everyone physically present in the United States, not only citizens. The Supreme Court said so directly in Zadvydas v. Davis: the Due Process Clause of the Fifth Amendment “applies to all persons within the United States, including aliens, whether their presence is lawful, unlawful, temporary, or permanent.”11Legal Information Institute. Zadvydas v. Davis Undocumented immigrants have enforceable rights during encounters with police, ICE, or Border Patrol.
The Fifth Amendment protects you from being compelled to be a witness against yourself.12Constitution Annotated. Fifth Amendment – Exclusion of Aliens Seeking Entry into the United States In practice:
- You can stay silent. You aren’t required to answer questions about where you were born, how you entered the country, or your immigration status. You can say, “I am exercising my right to remain silent.”
- You can ask if you are free to leave. If the officer says yes, walk away calmly. If the officer says no, you are being detained, and the right to remain silent still applies.
- You can refuse a search. Unless the officer has a warrant, say “I do not consent to a search” of your person, belongings, or vehicle. It won’t always stop the search, but it preserves your position later.
- Passengers have rights too. If you are a passenger in a car that gets pulled over, the driver has to produce a license and registration, but you don’t have to answer questions or hand over ID.
- Never present false documents. Using a fake ID or someone else’s papers is a federal crime and makes everything worse.
These rights are real, but using them under pressure is hard. Officers may not tell you that you can stay silent. They may ask the same question different ways. Knowing your rights in advance makes it more likely you will actually use them.
If You Are Detained
If ICE takes you into custody during travel, federal immigration law governs what happens next. The government can hold you while it decides whether to pursue removal, or it can release you on bond starting at a statutory minimum of $1,500.13Office of the Law Revision Counsel. 8 USC 1226 – Apprehension and Detention of Aliens Bonds are often set higher depending on the immigration judge’s view of flight risk and community safety. To get bond, you typically need to show ties to the area, family connections, employment, and a clean criminal record.
Some people face mandatory detention with no bond option. That applies if you have a prior deportation order, certain criminal convictions, or if ICE classifies you as an arriving alien.13Office of the Law Revision Counsel. 8 USC 1226 – Apprehension and Detention of Aliens
Voluntary Departure or Fighting Your Case
After detention, you may be offered voluntary departure: agreeing to leave the country on your own within a set timeframe. The main advantage is that no formal deportation order goes on your record, which can make legal return easier later. A deportation order can bar re-entry for up to ten years or make you ineligible for certain immigration benefits.14U.S. Department of Justice. Information on Voluntary Departure
Voluntary departure isn’t always the right move. If you qualify for asylum, cancellation of removal, adjustment of status, or another defense, fighting your case in immigration court may be the stronger path. And if you accept voluntary departure and then fail to leave by the deadline, the consequences are severe, with fines and penalties that make future legal entry extremely difficult.14U.S. Department of Justice. Information on Voluntary Departure Don’t make this decision without a lawyer if you can help it.
Talking to a Lawyer
You have the right to speak with an attorney once you are in immigration custody and to have a lawyer present at your immigration proceedings. Unlike criminal cases, the government does not provide a free lawyer for immigration hearings. You have to find and pay for one, or find a legal aid organization that handles immigration cases. Ask to make a phone call as soon as you are in custody. Contact an immigration attorney or legal aid hotline before signing anything or answering substantive questions.
Traveling With Children
TSA does not require children under 18 to show ID for domestic flights.1Transportation Security Administration. Acceptable Identification at the TSA Checkpoint A child can fly domestically with a parent or guardian who has proper ID, and the child won’t be asked for documents. Airlines may set their own rules for unaccompanied minors, so check before booking.
The harder question is what happens to children if a parent is detained during travel. If you are taken into custody with your children present, ICE policy generally calls for agents to let you arrange care before you are transported. If arrangements can’t be made quickly, the children may be placed with state child protective services. Once that happens, staying involved in custody proceedings from a detention facility is extremely difficult, and detained parents have historically struggled to keep regular contact with their children or attend family court hearings.
Plan for this before any trip. Identify a trusted person with legal status who could step in as caregiver. Consult an attorney about a guardianship, power of attorney, or caregiver authorization that lets this person make decisions about schooling, medical care, and other needs. Keep copies of your children’s birth certificates, medical records, and school enrollment documents somewhere the designated caregiver can reach. None of this eliminates the risk, but it can keep a bad situation from becoming a catastrophic one.
Preparing Before You Travel
Organize your documents first. Gather your passport, any immigration paperwork (including your alien registration number if you have one), birth certificates, medical records, and financial documents. Make copies. Store them in both a physical binder and an electronic folder shared with a trusted family member or friend. If you are detained, the people helping you will need these.
Have a plan for what happens if you don’t come home when expected. Someone should know your travel route and timeline. Save the phone number of an immigration attorney or legal aid organization in your phone and write it down somewhere your family can reach. If you are traveling on a foreign passport, keep it on your person, not in checked luggage or an overhead compartment.
Weigh the necessity of each trip against the current level of enforcement. For essential travel, pick routes that minimize exposure to checkpoints and high-enforcement areas. For non-essential trips, particularly by air, ask whether it is worth the added scrutiny. No one should have to think this way to visit family or reach a medical appointment. It reflects how enforcement actually works in 2026.