How Airport Check-in Works and What You Need

What is airport check-in

Airport check-in is really a two-part process. The first part is the check-in itself – verifying who you are and issuing the boarding pass that entitles you to board. The second is dropping off your checked baggage – the suitcase or bag that will travel in the aircraft's cargo hold, separately from you.

Without checking in, you won't get on board. Your boarding pass is the key to everything that follows – security screening, getting to your gate, and boarding the plane.

What you need for airport check-in

• An ID document is essential. Within the Schengen area, a valid national ID card is enough. For flights outside Schengen (the United Kingdom, Turkey, Egypt, the USA, and the like), you need a valid passport. Most destinations require it to be valid for at least six months beyond your planned return date.
• Your ticket, or its electronic version, can be shown either printed or as a QR code in your airline's app. Just bring it up on your phone and the agent will scan the code.
• Your booking reference comes in handy at a self-service kiosk or during online check-in. You'll find it in the confirmation email from your airline.
• Weigh your luggage at home. A surprise at the counter – say, a suitcase 2 kg over your fare's allowance – gets expensive fast. Excess-baggage fees charged on the spot are far higher than buying extra allowance online in advance. You'll find the exact weight and size limits for both carry-on and checked baggage with your airline in our overview of carry-on baggage dimensions.

For a full picture of everything that happens at the airport, from arrival to boarding, see our guide on how things work at the airport. When planning your journey, it also helps to know how long before departure you should be at the airport. With a child, a stroller, or in peak season, build in a generous extra buffer.

How airport check-in works step by step

Arrival and the departures board

When you walk into the departure hall, look for the large board labeled Departures. It shows your flight, departure time, assigned counters, and current status. The information updates in real time, so check it as soon as you arrive and once more just before heading to security.

Counters are organized by airline and flight. Signs above each counter show which flight and airline it serves. Larger airlines usually have several counters open, so the queues spread out evenly.

Check-in and baggage drop

At the counter, present your ID and your ticket or booking reference. The agent verifies your identity, assigns or confirms your seat, and issues your boarding pass. If you're checking a bag, the agent weighs it, attaches an identification tag with a barcode, and your suitcase disappears down the conveyor belt. The next time you'll see it is on the baggage claim carousel after landing.

Your carry-on – a smaller bag or backpack – travels with you in the cabin. The rules for its size and contents depend on your airline and fare. We explain what checked baggage is and how it differs from carry-on in a separate guide.

Schengen and non-Schengen flights

For flights within the Schengen area, you go straight to security screening after dropping off your baggage. For flights outside Schengen – to London, Ankara, Dubai, or New York, for example – you'll also pass through passport control. Allow extra time and arrive at least 3 hours before departure.

Security screening and getting to your gate

After check-in, head to security. Take your laptop and tablet out of your carry-on, place your liquids in a clear bag in a separate tray, and remove your jacket and belt. Once you're through the metal detector, collect your belongings and watch the board for your gate number.

We also have a separate article on how airport security screening works.

How airport check-in works – types of check-in

Counter check-in

The traditional way. You wait in line, present your documents and ticket, and walk away with your boarding pass. The upside is personal service – the staff can advise you and sort out complications (connections, special baggage, seat-change requests). The downside is the queues, especially on peak-season mornings or with low-cost carriers just before departure.

Online check-in

Done through the airline's website or app, usually 24 to 48 hours before departure. You get an electronic boarding pass, pick your seat, and skip the counter queue. If you have a bag to check, just head to a dedicated drop-off counter, hand over your suitcase, and avoid the main line.

Self-service kiosk

A terminal at the airport where you complete check-in without staff assistance. You enter your booking reference or scan your ID, the system verifies your details and prints your boarding pass. If you have checked baggage, you'll still end up at a counter to hand over your suitcase.

Automated check-in at the airport

Most major airlines at Prague Airport and many other airports now offer automated self-service terminals. The process is simple: walk up to the terminal, insert or scan your ID or enter your booking reference, confirm your seat, and the terminal prints your boarding pass.

The whole process typically takes 2 to 3 minutes, and you skip the main queue. For a passenger traveling with carry-on only, it's the fastest route from the airport doors to security. If you have a suitcase to check, however, the automated terminal only handles the check-in itself. You'll still need to drop the bag off at a counter or a baggage drop-off point.

Common mistakes that cost you time

• Heading to the wrong terminal is a classic mistake, especially at Prague Airport. Terminal 1 handles flights outside the Schengen area, Terminal 2 flights within it. Getting between the terminals takes 10 to 15 minutes – time you may not have during a morning rush.
• Not double-checking your gate or departure time is risky, especially at a busy airport. Both can change even an hour before departure. Keep an eye on the board or on notifications in your airline's app.
• Underestimating rush-hour traffic – in summer, the morning drive from central Prague to the airport can easily take 50 minutes instead of the usual 20. Plan your journey realistically, not optimistically.
• Documents buried at the bottom of your suitcase will slow you down at every counter. Your passport, boarding pass, and insurance card belong in a small pocket or belt bag where you can pull them out in 5 seconds.

Tip: If your flight is delayed by more than 3 hours, you're legally entitled to financial compensation of up to 600 EUR. You'll find the details and how to file a claim in our guide on flight delay compensation.

Now you know how airport check-in works – all that's left is to arrive on time

Anyone can handle airport check-in as long as they arrive with time to spare and have their documents ready. Departures board, counter or kiosk, baggage drop, security screening, gate. Five steps that become routine after your very first flight.