Heathrow sits inside the busiest motorway interchange in the UK, with the M25, M4 and the A4 all feeding the airport directly. The route you take, the terminal you aim for and the time you arrive all matter. Get any of them wrong and you can lose 20 to 40 minutes on a trip that should be 10. Here is the operational guide for driving to Heathrow in 2026.
Which terminal you need
Heathrow has four active terminals (T2, T3, T4, T5) and they are not all in the same place. T2 and T3 share the central campus. T4 sits on the south side of the airport, separated from the central area by the runways. T5 is on the western edge with its own dedicated road approach. Picking the wrong terminal exit on the motorway adds 5 to 15 minutes.
- T2 (The Queen Terminal): central terminal area, Star Alliance carriers.
- T3: central terminal area, American Airlines, Virgin, Cathay, Emirates, Qantas.
- T4: south side, SkyTeam (KLM, Air France, Delta), Etihad, Qatar.
- T5: western edge, British Airways exclusively and Iberia.
Check your terminal on your booking before you set off. Heathrow has free inter-terminal transit (Heathrow Express train within the airport, or buses) but the transit adds 15 to 25 minutes each way which destroys the parking saving on a cross-terminal mistake.
Routes by direction
From central and east London
M4 westbound, leave at Junction 4 (M4 spur into the airport). Signs split for T2, T3 and T4 a mile before the central terminal area. T5 has its own exit slightly further west off the M25.
From south London and Surrey
M25 anticlockwise, leave at Junction 14 for T5 specifically, or continue to Junction 15 then the M4 spur for T2, T3 and T4. The M25 Junction 14 is the only direct T5 approach without a U-turn.
From the Midlands and north
M40 southbound, M25 anticlockwise to Junction 14 (T5) or 15 (M4 to central terminals). The M25 between J15 and J14 is congested most of the day; build in 15 to 30 minutes' contingency.
From the west and Wales
M4 eastbound, leave at Junction 4. Signs split for T2, T3 and T4 ahead. For T5, leave the M4 at Junction 4b and follow signs.
From south coast
A3 northbound to the M25 anticlockwise, then Junction 14 (T5) or 15 (M4 to central). The A3 / M25 interchange is itself a bottleneck at peak times.
The drop-off rule
Heathrow forecourt drop-off is £7 for up to 10 minutes, enforced by ANPR cameras, payable online by midnight the day after your visit. The fee applies to every visit, including stops under a minute. There is no free forecourt option at any terminal. The only free drop-off is at Heathrow Long Stay car parks with a free shuttle into the terminal, which adds 15 to 25 minutes each way. For the full breakdown and the exemptions for Blue Badge holders, see our Heathrow drop-off charges guide.
The ULEZ and emission zone rules
Heathrow is inside the expanded Ultra Low Emission Zone (ULEZ). A vehicle that does not meet ULEZ standards pays £12.50 per day to enter, regardless of where you park. The fee is in addition to the £7 drop-off charge and any parking fees. Check your vehicle on the TfL ULEZ checker before you set off. Most petrol vehicles from 2005 onwards and most diesel vehicles from 2015 onwards are compliant.
Traffic timing
- 05:00 to 06:30 weekday mornings: the worst window. Half of London is heading to Heathrow at the same time.
- 09:30 to 14:00: the easiest window. Traffic light, parking forecourts uncongested.
- 15:30 to 19:30 weekdays: evening peak; M25 and M4 both heavy.
- Late evening 20:00 onwards: easy traffic, but check shuttle frequencies if Long Stay parking.
Add 30 minutes contingency for any school-holiday peak day, particularly the Saturday at the start of summer half-term.
Where to park once you arrive
Each terminal has its own Short Stay multi-storey (premium price, 2 to 3 min walk to check-in), and the Long Stay car parks (cheaper, 8 to 12 min shuttle). T5 has Pod Parking, unique to that terminal, with a 6 minute driverless transfer. Off-airport operators are reached via the M4/M25 and have their own onward shuttles. For the full comparison, see Cheapest Heathrow Airport Parking in 2026.
Five mistakes that cost you time on arrival
- Aiming at the wrong terminal exit. Adds 5 to 15 minutes on the motorway.
- Not checking inter-terminal transit before booking parking. Free transit adds 15 to 25 minutes each way.
- Forgetting the drop-off charge. £7 every visit, plus the £100 penalty if you do not pay within 24 hours.
- Not checking ULEZ compliance. Older diesel pays £12.50 to enter Heathrow's catchment.
- Cutting the timing too fine. M25 traffic is unpredictable. Build in 30 minutes contingency on top of your normal route time.
See live parking prices
For real-time parking prices across every Heathrow terminal, see our Heathrow parking comparison page. For the full guide to choosing the right product type, see our Heathrow buyer guide.