Visa, eTA, eVisa, ESTA, ETIAS: Understanding the Differences Between Travel Authorisations

These are different names for the same underlying principle: a fully digital travel authorisation, mandatory before departure.

The application, the payment of fees, the review of the file, and the final decision all take place exclusively online. No physical sticker is placed in the passport, and no consular appointment is required.

The exact term used depends solely on the destination:

• eTA (Electronic Travel Authorization): Canada, United Kingdom (UK ETA), Australia (ETA), South Korea (K-ETA), Israel (ETA-IL).
• ESTA: A system specific to the United States, designed for travelers under the Visa Waiver Program.
• ETIAS: A digital entry system for the Schengen Area for visa-exempt nationals.
• eVisa: A traditional visa whose application and issuance have been fully digitised (e.g. India, Turkey, Kenya, Sri Lanka).

Australia was the pioneer, creating the ETA (Electronic Travel Authority) as early as 1996 — the world's first system to remove the need for a physical passport visa for low-risk tourists. Since then, the model has spread across every continent, driven by two main goals: strengthening national security and speeding up border crossings.

Because a refusal of entry after landing is costly and creates severe bottlenecks, border screening has been moved earlier, before departure.

Under the traditional immigration model, migration checks took place upon landing. A passenger deemed inadmissible was turned away at the border, which created significant costs for airlines (who are legally required to fly the passenger back), congestion at customs desks, and a stressful experience for the traveler.

By introducing a mandatory electronic authorisation before departure, governments moved the checkpoint further upstream: if the system detects a security or migration risk, boarding is automatically blocked at the airport of origin.

Through Timatic, the global database maintained by IATA, which airlines query automatically at check-in.

For this global model to work, airlines need to verify in real time whether a passenger holds a valid clearance before letting them board. This is where IATA (the International Air Transport Association) comes in. Since 1963, IATA has maintained Timatic, a leading global database listing the entry requirements of more than 220 countries and territories.

Continuously updated from over 2,000 official sources (interior ministries, immigration services, embassies), Timatic is automatically queried by airline check-in systems when your passport is scanned at the airport. If your eTA, ESTA, or eVisa is not valid, or is not correctly recorded in the host country's database, you will automatically be denied boarding.

There is no international body that harmonises electronic travel authorisations. Each country designs its own system under its own national immigration law, which explains why the name, validity period, and conditions vary from one country to another. This is the case, for example, with the US ESTA, created under the country's own Visa Waiver Program, or with the Canadian eTA and the UK ETA, each introduced separately by its own government.

ETIAS is an exception to this national logic: rather than being specific to a single country, it is a regulation adopted jointly by the European Union, which is why a single name and a single system cover 30 participating European countries at once.

This diversity is not likely to settle into a single global standard: every new country that introduces an electronic clearance does so under its own legislation, with its own rules on naming, duration, and cost — as has already happened with South Korea and Israel. This pattern will repeat as more destinations adopt this model.

Because this length of stay is set by the pre-existing visa-exemption agreement between the two countries, not by the electronic system itself.

An eTA or ESTA does not create a new legal right of entry: it adds a pre-travel screening step to a visa-free entry right that already existed between the two countries. It is this underlying bilateral agreement, which predates the electronic version, that sets the authorised length of stay. This is why the US ESTA limits stays to 90 days (the duration set by the Visa Waiver Program), while the UK ETA allows stays of up to six months: each inherits the conditions negotiated long before its electronic version was introduced.

An eVisa follows a different logic. Unlike an eTA, it is not based on a pre-existing exemption agreement: it digitises the process of a traditional visa application, while keeping an individual review of the file. This is why an eVisa can cover a wider range of travel purposes than an eTA, but with a less predictable processing time.

This same logic also explains why you cannot simply « choose » your system: your destination determines, based on your nationality, whether you fall under a visa, an eVisa, or an eTA, depending on the treaties in place between your country and theirs.

Beyond the theory, these rules have a direct impact on how you prepare for your trip and how compliant your application needs to be. Here are precise answers to the most common practical questions:

Does an eTA remove human review entirely?

No, it shifts it rather than removing it. An eTA or ESTA relies on an automated check that immediately cross-references the information provided against national security databases. If the system flags an alert or an inconsistency, the file is escalated for manual review by an immigration officer. A traditional visa or an eVisa, by contrast, involves human review of the file in almost every case, including verification of supporting documents.

Is an eTA's validity tied to the passport?

Yes, this is an absolute rule. Whether it is a visa or an electronic authorisation (eTA, ESTA, eVisa), the clearance is electronically linked to the specific passport number provided during enrollment. If your passport expires, is lost, or is renewed, the authorisation becomes void immediately, even if its stated validity period (for example, 2 years for an ESTA, or 5 years for the Canada eTA) has not yet ended. Traveling on a new passport means you must submit a brand-new application.

Does an eTA allow an unlimited number of entries?

Generally, yes. Most eTAs and ESTAs allow multiple entries throughout their validity period. However, this does not exempt you from respecting the maximum length of stay allowed per visit (for example, 90 consecutive days), which is still checked by border officers at every entry.

Are eTA fees refunded if the application is refused?

No, in the vast majority of cases. The fees collected by governments cover the administrative processing and security screening of the application, not a guaranteed approval. If your application is refused or cancelled due to a data entry error, the government fee is non-refundable. This is why having your application verified before submission, through a service like Service eVisa, is far more effective than trying to fix an error after a refusal.

Do you need a biometric passport for an eTA?

In almost all cases, yes. Digital authorisation systems rely on the automated scanning of optical and chip passport data. An expired, damaged, or non-biometric passport will result in your application being rejected or your boarding being denied.

Can you hold several valid eTAs or ESTAs at the same time?

Yes, each authorisation is completely independent of the others. A Canadian eTA, a US ESTA, and a UK ETA can all be valid simultaneously on the same passport, since each government reviews and issues its own clearance independently. This is particularly useful for travelers combining several international destinations within a single itinerary.

Is an eTA refusal final?

No, several options usually remain available. Depending on the programme, a refusal issued by an automated system can sometimes be supplemented with additional supporting documents. If no direct appeal is possible, you can generally submit a new application once your situation is clarified, or apply for a traditional consular visa if required.

Do you need an eTA for a simple airport transit?

This depends entirely on the country of transit; there is no universal rule. Some systems exempt pure international transit within the sterile zone, while others (like the US and Canada) require a valid authorisation as soon as your plane touches down, even if you do not leave the airport terminal. The most reliable way to check is to consult your airline, as they enforce these rules directly via the Timatic database.

Can you apply for an eTA on behalf of someone else?

Yes. Each traveler must hold their own individual clearance, but a parent, guardian, or representative can complete the online applications for an entire family or group. However, each application is processed independently and must match the physical passport details character-for-character.

Submitting your application yourself on a government's official website is always an option. However, the complexity of foreign-language forms, strict legal eligibility criteria, and the risk of making an irreversible typo lead many travelers to seek professional support.

This is precisely the role Service eVisa plays:

• Preventive review of your application: Our specialists verify the consistency of your data and documents before official submission, eliminating typos, transposed characters, and formatting errors that cause automated refusals.
• Assistance with follow-up requests: If migration authorities request clarification or supporting documents, our team guides you through responding in the required official format.
• Oversight by certified experts: For destinations with strict regulatory requirements, such as Australia and New Zealand, your applications are handled or supervised by accredited professionals, including Azam Jafari (MARA-accredited migration agent) and Tatiana Elvery (IAA-accredited immigration adviser).