Six hours on the ground: when a Heathrow connection turns into an evening

The printed gap and the usable one

Every layover question reaches this desk with one number attached: the gap between two flights, as the booking prints it. It is the wrong number to plan with. Between the first aircraft touching the runway and the second one shutting its door, a good share of the time is already spent on things nobody can hurry: the taxi to the stand, the walk to the border, the queue once you reach it, the road to a hotel, and then most of that again in reverse with a security search added.

What survives those deductions is the usable window, and it is the only figure worth taking into a decision. The desk works it out from the gate backwards rather than from the landing forwards, because the end of the evening is fixed and the start is not. An arriving aircraft can be early or late. A departure gate closes when it closes.

One condition comes before any of the arithmetic. Leaving the airport means entering the country, so the ordinary entry rules apply to you: a visa if your passport needs one, and the electronic travel authorisation that most visa free visitors are now asked for before they board. If either is missing, the layover is spent airside whatever its length, and there is no sum to do.

Start at the gate and walk back

Take the departure time and subtract the gate first. Most airlines shut the door at least twenty minutes before the scheduled time, and some long haul flights shut it earlier. At Terminal 5 the B and C gates are in satellite buildings reached by a short underground train, which puts another ten minutes between the security hall and your seat. At the other terminals the long piers do the same job on foot.

Then subtract security, which is the part that varies. The desk's working rule, for a guest carrying only hand luggage with a boarding pass already on the phone, is to be back inside the terminal two hours before a long haul departure and ninety minutes before a short one. A margin that is never used costs a coffee. A margin that is missing costs a flight.

Then subtract the ride back. From a walkway hotel, ten minutes covers the lift, the checkout desk and the corridor. From the northern row along the Bath Road, allow twenty to the central terminals and more to Terminal 4, which sits beyond the southern runway.

The front end: wheels down to the kerb

The arrival half of the sum is less predictable, so it deserves pessimism. From touchdown to the landside kerb, half an hour is a good day: a short taxi, eGates open, no hold baggage, no queue. An hour and a quarter is an ordinary bad one, with a long walk from a remote stand, a wave of long haul aircraft arriving together and a staffed desk for passports the gates will not read.

If your bag is checked through to the final destination on one ticket, it normally stays airside and you will not see it again until you land somewhere else. Two separate tickets change everything, because the bag has to be collected, carried and checked in again, and that adds the best part of an hour to each end.

Six hours, eight hours, ten: the sum worked through

Take a flight landing at four in the afternoon and a long haul departure at ten at night from the same terminal, which is the kindest version of a six hour connection. Kerb by five on a decent day, a room at Terminal 5 by twenty past, back in the terminal by eight. The window is about two and a half hours, and the shower, the change of clothes and the checkout desk all come out of it.

That is the honest meaning of an expensive taxi. It is not impossible, but it holds a booking at the floor of the ladder only if every piece lands where it should, and at this airport one piece usually does not. Six hours across two terminals, or with a hold bag, or with a hotel on the far side of the tunnel, is not a window at all. The desk will say so on the first message rather than at the door.

Eight hours at the same terminal gives a window of roughly four and a half, which holds the floor of the ladder with room to breathe: three hours at £700, with her journey from town counted inside them, and some slack at either end. Ten hours or more gives a window of six, and that is where a proper evening starts: the dinner line at £900, a table at the hotel and no watch on the wrist. A connection that crosses a night belongs to the overnight at £1,800, and nothing about it needs rushing.

When this desk says a real evening wants five or six hours, it means five or six hours of window, not of itinerary. Keep those two numbers apart and most layover decisions make themselves.

The hotel that buys back the most time

Nothing on the Heathrow map saves more minutes than resting at the terminal you leave from. TW6 2GD connects to Terminal 5 under cover, TW6 3AF does the same at Terminal 4, and a third sits a short walk from the central terminals. On a tight connection those three are the only buildings worth considering, and the rest are listed on the airport hotels page.

If you land at one end and leave from the other, cross on arrival rather than just before departure. The terminal stations are joined by trains that cost nothing, and how that works is set out in changing terminals on the free train. The row along the Bath Road is the right choice for a long connection and the wrong one for a short one.

Why going into town is usually the wrong answer

The Heathrow Express reaches Paddington in about a quarter of an hour, and the Elizabeth line runs into the West End without a change, so a seven hour layover invites the idea of dinner in London. The trains are quick. Everything around them is not: getting down to the platform, waiting for the train, walking from the far station, finding the table, and then the whole thing backwards against a gate that will not wait for dessert.

Worked through honestly, seven hours of connection buys about two hours in town, most of it spent looking at a clock. The desk exists for the opposite arrangement. She travels out, you stay within ten minutes of your gate, and the time that would have gone on platforms goes on the evening instead.

When the layover stops being a layover

Some connections are not connections at all. A cancelled onward flight, a missed transfer rebooked for tomorrow afternoon, a three day wait for the only seat that works. At that point the question changes from whether to leave the airport to what to do with the days, and the page on extended stays and long layovers is the one to read.

For a short window, three names are worth asking for first. Laura can be out on the express from Paddington in fifteen minutes, which makes her the quickest arrival on this list when an aircraft comes in early. Tina moves a whole evening without complaint when a flight has moved it first. Rosa takes short notice at the perimeter hotels and never lets a plain room feel like a waiting room. All three are on the brunettes list. Send both flight numbers, both terminals and whether you carry a bag, and the desk will do the sum before anybody sets off. Booking explains what happens next, and rates carries the whole ladder.