A first flight feels complicated because nobody explains the order of events. There are only seven stages, and they run in the same sequence at every UK airport: documents at home, the journey, check-in and bag drop, security, the departure lounge, the gate, and on the way back, passport control and baggage reclaim. This guide walks through each one, flags the 2026 rule changes that catch beginners out, and tells you what to have in your hand at each point.
- Check passport dates a month before you fly: Schengen countries look at both the issue date and the expiry date.
- Security rules on liquids now differ between UK airports, so read your airport's page the week you travel.
- Your gate is shown on the departure boards, not your boarding pass, so find a screen as soon as you clear security.
What do you need to sort out before the day?
Your passport, your booking and your bags. For a trip to France, Spain or any other Schengen country, GOV.UK's entry requirements say a British passport must have been issued less than 10 years before the day you arrive, and must expire at least 3 months after the day you plan to leave. A passport renewed before October 2018 can fail the first test even if it looks in date, so check the issue date as well as the expiry. Outside Europe, look up the country on GOV.UK's foreign travel advice pages.
Next, read the airline's booking email. It tells you the terminal, how many bags you have paid for, the cabin bag size, and when online check-in opens. Most airlines let you check in online and download the boarding pass to your phone, which removes one queue on the day.
What happens on the way to the airport?
This is the stage most likely to go wrong, because it is the one with traffic in it. Work backwards from the time your airline's bag drop closes (it is in the booking), add time for security, then add the road journey. From Gerrards Cross, Heathrow is around 20–35 minutes by road, Luton around 50–65 minutes and Gatwick around 70–85 minutes. Our when-to-leave guide shows the arithmetic, and if the flight is at dawn, read early-morning airport transfers first. Being dropped at the terminal door means no car park bus to find and no long walk with a suitcase.
What is the difference between check-in and bag drop?
If you checked in online, you only need the bag drop desk, and only if you have a suitcase for the hold. The departure screens inside the entrance show which desk numbers your airline is using. You hand over the bag, it is weighed and tagged, and you keep the small tag receipt: if the bag goes missing, that barcode is how it gets traced. With hand luggage only and a boarding pass on your phone, you walk straight past this stage to security.
What happens at security?
You scan your boarding pass at a gate, join the queue, and put your bags and coat in trays for the X-ray machine while you walk through a scanner. What you take out of the bag depends on the airport. In September 2026 Heathrow and Gatwick let passengers leave liquids in containers of up to 2 litres and laptops inside the bag, while Stansted and London City kept the 100ml rule for liquids. Our hand luggage guide has the airport-by-airport table. Belts, large watches and anything in your pockets go in the tray. If staff want to search your bag by hand, it is routine and not a sign you have done something wrong.
What do you do in the departure lounge?
First, find a departures screen. Your boarding pass shows a boarding time and sometimes a gate, but the gate is usually confirmed on the screens later, so check your flight number there and note roughly when the gate will be announced. Then eat, buy water, use the toilets and charge your phone. If you are buying drinks or perfume in the duty-free shops, keep the sealed bag closed until you reach your destination. Some gates at large terminals are a long walk or a short train ride away, so head off as soon as yours appears.
How does boarding work?
At the gate, staff check your boarding pass and passport. Airlines usually board in groups or by seat rows, and the group is often printed on the boarding pass, so wait until it is called. Your cabin bag goes in the overhead locker or under the seat in front. Seat belt on, phone in flight mode, and listen to the safety briefing: it tells you where your nearest exits are on that particular aircraft.
What happens when you land back in the UK?
You follow the signs for arrivals and passport control. If you hold a British passport with the biometric symbol on the cover, you can use the eGates, and GOV.UK says children aged 8 to 17 can use them with an adult, provided they are at least 120cm tall. Then comes baggage reclaim: the screens show which carousel your flight's bags are on. If your bag does not appear, go to the airline's baggage desk before you leave the hall. Finally you pass through customs. If you are carrying goods over your personal allowance, such as more than 200 cigarettes or 4 litres of spirits, you must declare them.
What if the flight is delayed?
Stay near the departure screens and keep the airline's app open. Under UK rules the airline must provide food and drink once the delay reaches a set length, which the Civil Aviation Authority puts at two hours for flights under 1,500km. Keep receipts for anything you buy. For the return leg, a driver who tracks the flight number adjusts to the new landing time without you having to call; our guide to delayed and cancelled flights explains how that works.
How do you get home without any extra decisions?
Book the return car before you leave. With meet-and-greet, your driver waits in the arrivals hall, so after a first flight the only instruction is to walk out of customs and look for your name. See airport transfers from Gerrards Cross for how booking works.