What is a transit visa?

A transit visa is permission to pass through a country on the way to another destination, rather than to visit that country as your final stop.

What is the difference between airside and landside transit?

Airside transit means you stay in the international transit zone and do not pass border control. Landside transit means you pass immigration, collect bags, change airports, or otherwise enter the country during the connection.

Do I always need a transit visa if I change planes?

No. The answer depends on your passport, the country, whether you pass border control, the airport, and sometimes whether you hold another visa or residence permit.

Can an ETA or visitor visa replace a transit visa?

Sometimes. Some countries let you transit if you already hold a visitor visa, an ETA, or another exempting permission. Others still have separate transit rules.

Why do airlines care about transit visas?

Because the airline must check whether you can legally board and complete the journey. If your connection requires entry permission and you do not have it, the airline may deny boarding before you depart.

Transit Visas Explained: Airside vs Landside Transit (2026)

Updated 20 Jun 2026

What a transit visa is

A transit visa is permission to pass through a country on the way to somewhere else. It is not the same as a tourist visa, and it is not always needed. The answer depends on the connection pattern, not only on the destination.

The most important distinction is:

airside transit: you stay inside the international transit area and do not clear immigration
landside transit: you pass border control, even briefly

That difference can completely change the legal answer for the same passport and the same airport.

Why transit answers are so easy to get wrong

Transit rules depend on several variables at once:

your passport nationality
the country where you connect
whether you pass border control
whether you must collect and re-check baggage
whether the connection is in the same airport or a different one
whether you hold a valid visa or residence permit for another country
how long you stay during the connection

This is why “I am only changing planes” is not enough information on its own.

Airside vs landside transit

Airside transit

You remain in the secure international area and do not enter the country. In some systems this can avoid the need for a normal entry visa.

Landside transit

You pass immigration. That can happen because:

you need to collect checked baggage
your airline issued separate tickets
your next flight leaves from another terminal or airport that requires entry
the airport closes overnight
the country does not support sterile transit for your route

Once you need to pass immigration, the answer often shifts from “maybe no transit visa” to “you need transit permission or even a normal visitor visa”.

Official examples: UK and United States

The UK keeps two separate transit paths on GOV.UK:

Direct Airside Transit if you are not going through UK border control
Visitor in Transit if you are going through border control and leaving within 48 hours

Official source: GOV.UK transit visa overview

The United States is different again. Travel.State.Gov says Transit (C) visas are for people in immediate and continuous transit through the United States, but if the real purpose is sightseeing or visiting friends during the stop, that is not transit any more and a visitor visa may be needed instead.

Official source: U.S. Department of State - Transit Visa

What to check before you book

Before buying separate tickets or a tight self-transfer, confirm:

whether you will pass border control
whether baggage is checked through
whether your airport allows sterile airside transit
whether your passport needs a transit visa for that country
whether you already hold a visa or permit that creates an exemption

If any part is unclear, ask the airline and verify the official government rule for the transit country.

Bottom line

Transit visas are about how you connect, not only where you are going. The crucial question is usually whether you stay airside or go landside through immigration. Check the transit country, the airport setup, and your passport-specific rule before you book the route, not after.

This is general information, not legal or immigration advice. Always confirm the current transit rule with the official source for the country where you connect.