Do You Need a Travel Authorization for a Layover?
Whether a connection requires an authorization depends on the country and on whether you pass through immigration. The rules differ sharply between the US, Canada, the UK, and the Schengen Area.
The United States: no true transit exemption
The United States does not offer sterile international transit. Travelers connecting through a US airport are treated as entering the country and must clear immigration. Visa Waiver Program travelers therefore need an approved ESTA even for a connection, and travelers who are not eligible for the Program need a transit or visitor visa. There is no way to change planes in the US without being admitted.
Canada: an eTA for air connections
Canada requires visa-exempt travelers to hold an eTA when they fly to or transit through a Canadian airport, even without leaving the secure area. The eTA is not required when entering by land or sea, but a connecting flight is an air arrival for this purpose. A separate transit arrangement exists for certain nationalities on specific routes; most visa-exempt travelers simply need the eTA.
The United Kingdom: airside versus landside
Whether the UK ETA is required for a connection turns on whether you pass through border control. Passengers who remain airside and do not cross immigration generally do not need an ETA. Passengers who pass through the border — to change airports, collect and re-check baggage, or stay overnight — do need one.
The Schengen Area: the international transit zone
Visa-exempt travelers connecting through a Schengen airport and remaining in the international transit area generally do not need a short-stay authorization for the connection itself. Once ETIAS launches, transit through the international zone of a Schengen airport is not expected to require it, though entering the Area — even briefly — does. Some nationalities need a separate airport transit visa; visa-exempt travelers usually do not. For how this plays out at Schengen borders specifically, see our guide to EES and connecting flights.
The safe approach
Transit rules are among the most misunderstood in travel, and the penalty for getting them wrong is being denied boarding. Before booking a connection, confirm the rule for the specific country you connect through, and treat any connection that involves passing through immigration as an entry that needs whatever authorization that country requires.
Sources
The official pages for each authorization: US ESTA, Canada's eTA, the UK ETA, and the official ETIAS portal.
About this page
This page provides general information only and is not immigration or legal advice.