Layover in London: what to do

Yes, if you are allowed into the UK. Leaving the terminal means passing through UK border control, so you need either a visa or visa-free entry for your passport, or the transit-without-visa concession. If you are not admissible, you stay in the terminal.

The practical limit is time, not permission. Heathrow and Gatwick sit 25–50 km from central London, so a 4-hour stop is not enough to do anything useful. Six hours is the realistic floor for a quick look at Westminster; 8 hours or more lets you eat and walk without watching the clock.

Where you land matters. Heathrow (LHR) and Gatwick (LGW) have fast trains into the centre. Stansted and Luton are further out and slower to reach, so treat a layover there as an airport stop unless you have 10 hours or more.

UK rules separate two things: whether you may enter the country, and whether you may transit without a visa. Many nationalities can enter visa-free for a short visit. Others need a Standard Visitor visa even for a few hours outside the airport. A third group can use the transit-without-visa concession when they are passing through to another country within 24 hours, hold a confirmed onward ticket and have the right documents for that destination.

The concession is not automatic and it is not the same as visa-free entry. It also does not apply if you are switching between two UK airports by land. Rules change, so check the official gov.uk guidance for your nationality before booking a tight connection.

If you cannot enter, you can still move between terminals, use airside shops and lounges, and in some cases use a transit hotel. You cannot collect checked bags in most cases, so pack essentials in your cabin bag.

If your bags are checked through to your final destination, you will not see them in London, so carry what you need in your cabin bag. If you have to collect them, or you are on separate tickets, use left luggage rather than dragging a suitcase around.

Heathrow and Gatwick have left-luggage desks in the terminals, and there are luggage-storage points at several central London stations. Prices are per bag per day and vary by size and location, so treat any figure as a 2026 estimate and check on arrival.

Some airports and stations use self-service lockers or app-based storage shops nearby. Book ahead in summer if you need a large locker.

From Heathrow, the Elizabeth line is the default: fast, step-free and cheaper than the Heathrow Express, which is quicker but costs much more. The Piccadilly line is the cheapest option and the slowest, with many stops. From Gatwick, the Gatwick Express and Southern trains both run to Victoria; Southern is usually cheaper and only a few minutes slower.

Pay with a contactless card or phone on trains, the Tube and buses. Tap the same card every time, because caps are counted per card, not per person. A taxi from Heathrow to central London is far more expensive than the train and can be slow in traffic.

For the return leg, allow 3 hours at the airport before a long-haul flight and 2 hours before a short-haul one. Add buffer if you are travelling in the morning or evening peak.

Six hours is a taster. Take the train in, walk from Westminster to the London Eye along the river, cross to Big Ben and Westminster Abbey, then go back. Skip the inside of any attraction; the queues will eat your buffer.

Twelve hours adds one indoor stop and a meal. Pick one museum or gallery, or Borough Market for lunch, then walk the South Bank. Book a table or eat early to avoid the 18:00–20:00 rush.

Twenty-four hours lets you sleep and see two or three things properly. Base yourself near Paddington, Victoria or King's Cross so the airport run is short. A hotel near the station beats a cheaper one across town when you have an early flight.