Planes over Merton today
For Heathrow's expansion consultation, open until 22 December 2026.
Whatever your view, these are the figures for Merton now: the planes from Heathrow counted over each of its postcode districts, and the borough's noise, air and flood figures from official data. They are today's flights on today's routes, not those of a third runway. Sky Score takes no side in the consultation.
Heathrow's consultation page: how to respond, and Heathrow's own documents.
Planes from Heathrow, district by district
Planes land and take off into the wind, so the weather decides which way Heathrow flies, and that decides how many pass over each place. Counted over each postcode, January to August 2026.
Each cell gives the most planes over any one postcode of the district on that kind of day, then counts the district's postcodes by how many pass over them a day: 100 or more, 10 to 99, or under 10.
| District | Flying west56% of days | Both ways15% of days | Flying east29% of days |
|---|---|---|---|
| CR4911 postcodes | up to 96 a day521 at 10 to 99390 under 10 | up to 70 a day911 at 10 to 99 | up to 151 a day396 at 100+389 at 10 to 9943 on an edge83 under 10 |
| KT3753 postcodes | up to 18 a day142 at 10 to 99611 under 10 | up to 58 a day79 at 10 to 999 on an edge665 under 10 | up to 135 a day7 at 10 to 9925 on an edge721 under 10 |
| SM4581 postcodes | up to 59 a day492 at 10 to 9989 under 10 | up to 54 a day534 at 10 to 9947 under 10 | up to 107 a day1 at 100+16 at 10 to 9951 on an edge513 under 10 |
| SW191,659 postcodes | up to 8 a day1,659 under 10 | up to 77 a day1,435 at 10 to 99224 under 10 | up to 174 a day1,242 at 100+282 at 10 to 99135 under 10 |
| SW20570 postcodes | up to 19 a day12 at 10 to 99558 under 10 | up to 76 a day428 at 10 to 9936 on an edge106 under 10 | up to 171 a day301 at 100+135 at 10 to 9943 on an edge91 under 10 |
On an edge: the postcode is on the edge of a flight path, where a few metres decide whether a plane counts as overhead, and the fewest and the most within 100 m of it fall in different bands.
Each district's own page splits it by postcode sector and counts every airport over it.
Noise, air and flood in Merton
- Aircraft noise band
- Low-ModerateEstimated from the distance to the airport and its routes, scaled by the size of its DEFRA noise map
- Road noise
- ModerateDEFRA road Lden, share of postcodes over WHO 53 dB
- Air quality
- ModerateDEFRA background maps against WHO 2021
- Flood risk
- LowEnvironment Agency, Risk of Flooding from Rivers and Sea, allowing for defences
Merton: every figure we publish, with its score
What counts as overhead
Overhead means more than halfway up the sky (48.5 degrees or more) and below 7,000 ft, the CAA's definition of an overflight (CAP 1498). A day counts as one way when 80% of its flights used that way.
Where these figures come from
Counted from community flight tracking, checked against the CAA's monthly totals for Heathrow. Flight tracks: adsb.lol (ODbL 1.0); Weather at each airport: Iowa Environmental Mesonet; Ground heights: Contains OS data © Crown copyright and database right; Postcode positions: ONS National Statistics Postcode Lookup (OGL). Licence: Open Database License (ODbL) 1.0.
Aviation noise context: DEFRA strategic noise mapping, Open Government Licence v3.0
Flight routes: UK Aeronautical Information Publication (NATS), derived by Sky Score for the aircraft noise estimate; public but not openly licensed, and not for navigation
Road noise: DEFRA Strategic Noise Mapping Round 4 road Lden, Open Government Licence v3.0
Air quality: DEFRA background pollution maps (PCM), Open Government Licence v3.0
Flood risk: Environment Agency Risk of Flooding from Rivers and Sea, Open Government Licence v3.0