LHR
Can I leave Heathrow during a layover?
Short answer: usually yes once your layover reaches about 5h, and no if it's much less. There is no sterile transit here, so you cross the border either way. Here's the exact time you need — and what decides it.
Can you leave the airport?
Built from real transit times — buffers included.
| Layover | Time in city | Verdict |
|---|---|---|
| 3 hours | — | Stay airside |
| 5 hours | — | Stay airside |
| 6 hours | — | Stay airside |
| 8 hours | 2h 50m | Go for it |
| 10 hours | 4h 50m | Go for it |
| 12 hours | 6h 50m | Go for it |
| 24 hours | 18h 50m | Go for it |
The math behind it
Add these up and compare with your layover. If little is left, stay airside.
2h 30mImmigration
1h 10mTransit round trip · Airport rail
1h 30mBack through security
5hMin. layover to leave
Visa & transit
The UK has no universal sterile transit: many travelers pass the border even to connect, and an ETA or visa is now required for most visa-exempt visitors. Plan for immigration either way.
Updated: 28 July 2026 Rules change and depend on your exact ticket, airline and passport. Always confirm with your airline and the airport’s official immigration authority before you travel. GOV.UK — check if you need a UK visa/ETA ↗
Frequently asked questions
Can I leave Heathrow during a layover?
Usually yes, if your layover is at least 5 hours. You need about 150 min for immigration, 35 min each way in transit, and 90 min to get back through security — so aim to be at the gate with margin.
How long does immigration take at Heathrow?
Budget about 150 minutes as a planning estimate. It can be quicker off-peak and slower after several wide-body arrivals land together.
How do I get from Heathrow to London?
The Airport rail Elizabeth line reaches Paddington / Bond Street in about 35 minutes — the simplest, most predictable way to get in and back in time.
Do I need a visa to leave the airport in London?
The UK has no universal sterile transit: many travelers pass the border even to connect, and an ETA or visa is now required for most visa-exempt visitors. Plan for immigration either way. Always verify the official source before you fly.