Planes overhead in HA4
Hillingdon and Harrow, London. All 1,137 of its postcodes measured, January to August 2026.
From Heathrow
Planes land and take off into the wind, so the weather decides which way Heathrow flies, and that decides how many pass over HA4. Across its postcodes, January to August 2026:
- On a day it flies west (56% of days): up to 2 a day; of its 1,137 postcodes, 1,137 under 10
- On a day it flies both ways (15% of days): up to 14 a day; of its 1,137 postcodes, 31 at 10 to 99, 1,106 under 10
- On a day it flies east (29% of days): up to 14 a day; of its 1,137 postcodes, 25 at 10 to 99, 1,112 under 10
The table counts the postcodes of each sector by how many planes pass over them a day: 100 or more, 10 to 99, or under 10.
| Sector | Flying west56% of days | Both ways15% of days | Flying east29% of days |
|---|---|---|---|
| HA4 0219 postcodes | 219 under 10 | 219 under 10 | 219 under 10 |
| HA4 414 postcodes | 14 under 10 | 14 under 10 | 14 under 10 |
| HA4 6225 postcodes | 225 under 10 | 225 under 10 | 225 under 10 |
| HA4 7256 postcodes | 256 under 10 | 31 at 10 to 99225 under 10 | 25 at 10 to 99231 under 10 |
| HA4 8221 postcodes | 221 under 10 | 221 under 10 | 221 under 10 |
| HA4 9202 postcodes | 202 under 10 | 202 under 10 | 202 under 10 |
Over 33 of its postcodes, other flying passes too, from airfields, helicopters and airports we cannot check against official counts, so few planes from the airports we count does not mean a quiet sky there.
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.
Near HA4
HA5 HA2 HA6 HA1 UB6 UB1 HA3 HA0
The councils
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.