Trains run from Heathrow to central London in under 30 minutes, and Windsor Castle is about 20 minutes away by taxi. A long layover can take in Hyde Park, the British Museum or the castle. Most visitors now need a UK ETA or a visa, arranged before they fly.
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Short answer
Yes, if you're allowed into the UK and have about 5 hours or more. US, Canadian, Australian and EU travellers need an approved ETA (£20) before flying. Visa nationals such as Indian passport holders need a Visitor in Transit visa, though some with a qualifying US, Canadian, Australian, New Zealand, EEA or Irish visa or permit can transit without one. British and Irish citizens need nothing extra. Heathrow advises connecting passengers not to leave, so if you go, carry your onward boarding pass and be back 90 minutes before departure.
Is a Heathrow layover worth leaving the airport for?
If you have the time and the paperwork, yes. London Heathrow Airport (LHR) sits on the western edge of London, and fast trains run straight into Paddington, Bond Street and Tottenham Court Road. Windsor Castle is closer still, about 20 minutes by taxi.
Heathrow’s own connecting-flights page says it wouldn’t recommend leaving the airport, even on a long wait. That’s fair caution: a slow border queue or a delayed train can cost you a flight. If you do go, plan around these five things.
- Entry permission. Since 25 February 2026, visitors who don’t need a visa, including Americans, Canadians, Australians and EU, EEA and Swiss citizens, need an approved ETA to enter the UK, and must have it before they fly. It costs £20 and usually comes through within a day, but apply at least 3 working days ahead. You can’t get one at the airport. See visa and transit rules.
- Time. Allow about an hour to get off the plane, through the border and onto a train, and 30 to 50 minutes each way into town. Be back 90 minutes before departure. If you’re already checked in with only hand luggage, you clear security and walk to your gate, as the UK has no exit passport control. If you still need to check in or drop a bag, allow longer. That makes 5 hours the realistic minimum.
- The border. If you’re from the EU, the US, Canada, Australia or one of a few other listed countries, are 8 or older and hold an ETA, you can usually use the eGates, which are quicker. Everyone else queues at a staffed desk, so allow more time. See getting into London.
- Bags. The British Museum won’t accept wheeled cases, the Tower of London doesn’t allow suitcases, Windsor Castle may turn away large ones, and Windsor town has no left luggage. Leave them with the left-luggage desks first.
- Tickets. On one ticket your bags usually go straight through to your next flight. On separate tickets you’ll collect them and check in again, so you’ll pass through the border whether you planned to or not.
The fastest plan for a short layover
- Clear the border and follow signs to the Elizabeth line or Heathrow Express.
- Ride to Paddington (28 minutes on the Elizabeth line, 15 on Heathrow Express).
- Walk 10 minutes south into Hyde Park and Kensington Gardens: the Italian Gardens, the Long Water and the Serpentine.
- Head back from Paddington with time to spare.
Our 6, 8, 12 and 24-hour itineraries cover more, including a Windsor half-day and private tours that collect you at arrivals. Getting into London compares the Elizabeth line, Heathrow Express, the Tube, taxis and pre-booked cars.
Watch the calendar
- Sundays: Westminster Abbey and St Paul’s Cathedral are open for worship, not sightseeing. Big shops open for six hours only, often noon to 6pm.
- Windsor Castle is open Thursday to Monday and closed Tuesday and Wednesday. Changing the Guard there is usually at 11am on Tuesdays, Thursdays and Saturdays, weather permitting, so Thursday and Saturday mornings give you both.
- Late trains: the last weekday Elizabeth line trains from Paddington to Heathrow leave around 11pm.
Staying in the airport instead
Heathrow has no free sleeping areas and no sleeping pods. Every terminal has lounges you can pay for, some with showers. You can also book No1 Bedrooms in Terminal 3, the only airside rooms. If you can enter the UK, Aerotel in Terminal 3 arrivals rents rooms by the hour, and most of the hotels linked to the terminals sell daytime rooms too. See at the airport.