The zone currently covers all areas within the North and South Circular Roads - but on 29 August this will extend to include all London boroughs, including Richmond upon Thames where Heathrow Airport is.
This means if you’re running somebody to the airport in a vehicle that isn't compliant, you could be charged £12.50 on top of Heathrow’s £5 drop-and-go charge - a total of £17.50.
Is your car compliant for the Ultra Low Emission Zone?
Transport for London believes the impact of the expansion will be minimal. It told us that currently only a quarter of passengers arrive at Heathrow by car and believes it’s ‘unlikely’ that drivers liable to pay would change airports as a result.
Which airports are in the Ultra Low Emission Zone?
Heathrow will be the only new London airport affected by the Ulez expansion in August. London City Airport is already within the Ulez boundaries and the Congestion Charge zone. Gatwick and Luton will remain outside the zone.
How to avoid paying Heathrow’s drop-off fee
If you’re dropping somebody at Heathrow by car, you could save £5 by dropping them at the long stay car park which is free for 30 minutes. From there, passengers can use the free shuttle bus to the terminals.
Public transport to Heathrow
There are a number of train and bus routes you can take to Heathrow to avoid the online payments for driving there.
By train
If you’re using the London Underground, both the Piccadilly and Elizabeth lines serve the airport.
From King’s Cross:From Euston:By bus
If you’re stopping at an airport hotel the night before your flight, there’s usually a regular free shuttle service to the terminals.
source https://www.which.co.uk/news/article/emissions-zone-driving-to-heathrow-a9eWq6r1vNkc