What time do Heathrow taxis start running?
There isn't a start time. Taxis to Heathrow run 24 hours a day, every day of the year, because flights don't stop at midnight and neither does the demand for a lift to catch them.
What actually changes overnight
What genuinely changes overnight is not availability but traffic. Between roughly 1am and 5am, the M4 and the roads through Slough and Colnbrook are close to empty, so a 3am pickup from Maidenhead can reach Terminal 5 in under 25 minutes — a journey that might take 40 in Friday rush hour. If your flight has a 4:30am check-in cutoff, an early pickup is usually the safer bet, not because a car won't be there, but because you'd rather have slack in hand than none.
Which terminal you're using still matters
Heathrow's terminals sit in different parts of the airport, and T5 in particular is reached by a different route to Terminals 2, 3 and 4. Telling us which terminal at booking, even at 3am, means the driver takes the right route from the start rather than defaulting to the central complex — see our notes on getting to and from Terminal 5 for how much this can matter on timing.
Booking an early or late pickup
The one thing that matters more overnight than during the day is giving a real flight number when you book, not just a pickup time. Flight numbers let a driver check actual departure and adjust the collection time if your flight has moved — useful for the 6am departures that get brought forward as much as delayed. Book the night before if you can, simply so the driver has your details locked in before they start their shift; our guide on how far ahead to book an airport taxi covers this in more detail if you're planning a very early or unusual departure.
Terminal drop-off at odd hours
Heathrow's terminal forecourts are staffed and lit at all hours, and drop-off works exactly the same at 3am as it does at 3pm — pull up, bags out, gone. The only practical difference is that security queues at Terminal 5 tend to be shorter before 5am, which is one more reason an early pickup for a 6am or 7am flight is usually worth it even if it feels aggressively early when your alarm goes off.
What about picking someone up from an overnight arrival?
Same answer: the car is there. Give the flight number, and pickup adjusts to actual landing time rather than the scheduled one, so you're not sitting in an empty arrivals hall at 2am waiting on a flight that landed at 1:40. If you want the full detail on how delays and early landings are handled, we've covered it separately in what happens if your flight is delayed and a taxi is already booked.
Practical tips for a very early pickup
A few small things make an early booking go smoothly: leave a light on so the driver can see the house number easily, have your bags by the door rather than still being packed when the car arrives, and keep your phone nearby in case the driver needs to confirm the exact spot on a dark, quiet street. None of this is essential, but on a residential road at 3am it saves the few minutes that can matter most when you're working to a tight check-in.
Booking from further afield
The same 24-hour service applies wherever you're travelling from — a fixed-price run from Marlow, Burnham, Windsor or Slough is booked and priced the same way at 3am as it is at 3pm, with the only real difference being how quiet the roads are.
Does the fare change for a very early or late pickup?
No. The fixed fare for a given route is the same whether the pickup is at 3pm or 3am — there's no overnight surcharge built into the price, and you'll know the exact fare when you book regardless of the hour. What does change is the traffic, and usually in your favour: quieter roads overnight often mean a faster, smoother journey than the equivalent trip during the day.
Drivers on the overnight shift
Overnight and pre-dawn pickups are covered by drivers working those hours as a normal part of the rota, not as an occasional favour. That matters for reliability — a driver on an overnight shift is expecting early bookings and planning their night around them, rather than being woken up or pulled off another job at short notice.
The practical version
If you've got an odd-hours flight from Burnham, Slough, Windsor, Maidenhead or Marlow, the advice is the same regardless of the hour: book ahead, give the flight number, and call rather than message if it's inside a two-hour window — a live person confirming a 3am car is worth more than a form.
