Changing planes in the United States counts as entering the United States. There is no international transit zone. If you land on US soil, you clear immigration, and you need an ESTA.
Why a layover is a full entry
Many countries let you connect without passing border control. The United States does not. Every passenger arriving on an international flight goes through immigration and customs, even with a two-hour connection to a third country.
That means the same rules as any other traveller: a chip passport, an approved ESTA or a visa, and a border officer who decides whether you come in.
What you have to do on the connection
- Leave the aircraft and follow the arrivals signs.
- Clear immigration. Your photograph is taken and your ESTA is checked.
- Collect your checked baggage, even though it is tagged to your final destination.
- Clear customs.
- Re-check your baggage at the transfer desk.
- Clear security again and go to your onward gate.
This is why a US connection eats time. Allow at least 3 hours at a large hub such as New York JFK, Miami, Los Angeles or Dallas. Two hours is tight. Ninety minutes is a missed flight.
What to put on the application
The form asks for an address in the United States. On a pure transit you have none. Enter the airport, the airline or the city of your connection, and answer the transit question honestly.
There is a specific question asking whether your trip is a transit to another country. Answer yes. It costs you nothing and it explains the short stay to the officer.
Flights that pass over but do not land
Overflying US airspace without landing needs nothing. A flight from Europe to Mexico that crosses the United States but never touches down requires no ESTA.
The moment the wheels touch a US runway, the rules apply, even for a technical stop.
Cruises and sea transit
The same logic applies at sea. A cruise that calls at a US port needs an ESTA for every passenger who is a national of a Visa Waiver Program country, even if you never leave the ship.
What can go wrong
- No ESTA. The airline refuses boarding at your departure airport, not at the connection.
- Too short a connection. You miss the onward flight and rebooking is at your own cost.
- Refused entry. You are returned to your point of origin, not forwarded to your destination.
If your only reason for touching the United States is a connection, compare the fare with a routing through Canada, Mexico or Europe. Sometimes the cheaper ticket costs more once you add the formalities.
Frequently asked questions
I stay airside the whole time. Do I still need an ESTA?
Yes. There is no airside transit in the United States. Everyone clears immigration.
My connection is 45 minutes. Is that enough?
No. Immigration, baggage reclaim, customs, re-check and security do not fit in 45 minutes on an international arrival.
Does the transit count against my 90 days?
Technically you are admitted, so yes, but a few hours makes no practical difference to a 90-day allowance.
Can I leave the airport during a long layover?
Yes, once you are admitted you are in the country and free to move. Keep an eye on the clock.
What if I am refused at the connection?
You are returned to where you came from. See ESTA refusals and what to do next.
Connecting through the USA?
Apply as soon as you book. A transit passenger who arrives at check-in without an ESTA does not fly at all.
USA ESTA Portal is a private, independent service and is not affiliated with the government of the United States.
Read next: what happens at US border control, step by step.
