Heathrow is not one building. It's four working terminals spread across a large site, and two of them are far enough from the others to be separate airports in practice. Turning up at the wrong one is one of the few airport mistakes that can genuinely cost you a flight.
Here's how to be certain which terminal you need, why it can change after you've booked, and what to do if you get it wrong.
The layout, and why it matters
- Terminals 2 and 3 sit together in the central area, walkable between each other.
- Terminal 4 is on a separate site to the south.
- Terminal 5 is on its own site to the west.
Getting between them takes time — transfers run on the Elizabeth line, the Piccadilly line and free inter-terminal buses, but you're adding a leg to your journey at exactly the moment you can least afford one. A driver dropping you at Terminal 3 when you need Terminal 5 hasn't taken you to the wrong end of a car park; they've taken you to a different site.
How to find your terminal, in order of reliability
- Your boarding pass or check-in confirmation. This is the most current source, because it's issued closest to departure.
- Your airline's own flight page, using your booking reference.
- Heathrow's flight search on heathrow.com, by flight number.
What not to rely on: what the terminal was last time, a general list of which airline uses which terminal, or a friend's memory. Airlines move between terminals, and Heathrow reorganises which airlines sit where.
Why your terminal can change after you book
The common causes are:
- A rebooking after a delay or cancellation. If the airline puts you on a different flight, the new flight may leave from a different terminal — and often nobody says this out loud.
- A codeshare. The airline you booked with isn't always the airline operating the flight, and the terminal follows the operator.
- An airline moving terminals, which happens periodically.
The practical rule: check your terminal again the day before you fly, and again if anything about your booking changes. If it has changed, tell your driver — a pre-booked transfer can be updated.
Arrivals: the same problem in reverse
Coming back, your pickup needs to be at the terminal you actually land at. Diversions and last-minute aircraft changes can move that, which is the practical reason to book an airport pickup against your flight number rather than a time and a terminal alone — it lets the driver follow what your flight actually did. Our waiting time and meet-and-greet guide explains how arrivals pickups work.
What to do if you're at the wrong terminal
Don't panic, and don't order another car. Inter-terminal transfers exist for exactly this and are quicker than going back out to the road:
- Check the departure boards for the correct terminal and your flight's status.
- Follow signs for inter-terminal transfer — trains and buses run frequently between terminals.
- If you're close to the bag drop deadline, speak to airline staff rather than joining the back of a queue.
The one thing that makes this much worse is hold luggage plus a tight deadline, which is the argument for building margin into the plan in the first place — see how early to arrive at the airport.
Telling us your terminal when you book
Give the terminal number in your booking, not just "Heathrow". It changes where the driver goes, how long the journey takes, and — for a pickup — where they wait. If you don't know it yet, book anyway and send it when you have it.
For pickup points, drop-off arrangements and the wider Heathrow picture, see our Heathrow airport guide and the Heathrow airport page. For fixed prices from your postcode, see airport transfers by area.
Frequently asked questions
Q: How do I find out which Heathrow terminal my flight leaves from? A: Check your boarding pass or check-in confirmation first, then your airline's flight page, then Heathrow's flight search by flight number. Re-check the day before you travel.
Q: How many terminals does Heathrow have? A: Four working terminals — 2, 3, 4 and 5. Terminals 2 and 3 are together in the central area; Terminals 4 and 5 are on separate sites.
Q: Can my terminal change after I book? A: Yes — after a rebooking, on a codeshare where another airline operates the flight, or if the airline moves terminals. Check again before you travel.
Q: What happens if I go to the wrong Heathrow terminal? A: Use the free inter-terminal transfers rather than travelling back out by road, and speak to airline staff if you're near the bag drop deadline.
Q: Do I need to tell my driver the terminal? A: Yes. The terminals are on separate sites, so it changes the route and the drop-off point. Send it later if you don't know it when you book.
See fixed Heathrow transfer prices for your area or get an estimate.