MOD St Athan (EGSY)
Medium airport · St Athan, Vale of Glamorgan, Wales, United Kingdom
Airport data
| Name | MOD St Athan |
|---|---|
| ICAO | EGDX |
| Elevation | 163 ft (50 m) above mean sea level |
| Coordinates | N 51°24'19" W 3°25'60" 51.40523, -3.43325 |
| Location | St Athan, Vale of Glamorgan, Wales, United Kingdom |
| Scheduled service | No |
Runways
| Runway | Length | Width | Surface | Lighted |
|---|---|---|---|---|
| 07/25 | 5,997 ft (1828 m) | 141 ft | ASP | Yes |
MOD St Athan at a glance
MOD St Athan is a medium airport in St Athan, Vale of Glamorgan, Wales, United Kingdom. The field elevation of 163 ft (50 m) is the number every arriving pilot dials against QNH — circuit heights and initial approach altitudes at EGSY are all figured from it. There is no scheduled airline service listed here — typical traffic is general aviation, training and local operations.
The single runway, 07/25, offers 5,997 ft (1828 m) of asp surface, with runway lighting for night operations. Runway numbers give magnetic orientation: runway 07 points roughly 70° magnetic.
For the weather side of planning, the live METAR and TAF page for EGSY shows the current observation decoded line by line — wind on an instrument dial, visibility, cloud layers and the resulting flight rules — refreshed continuously from official sources.
Nearest airports to MOD St Athan
Distances are great-circle, measured from the field reference point — planning distances along airways or roads will run longer.
| Airport | Code | Distance |
|---|---|---|
| Cardiff International Airport | EGFF | 6 km (3 NM) |
| Swansea Airport | EGFH | 49 km (26 NM) |
| Bristol Airport | EGGD | 50 km (27 NM) |
| Royal Marines Base Chivenor | EGDC | 61 km (33 NM) |
| RNAS Yeovilton | EGDY | 71 km (38 NM) |
Flight-planning notes for MOD St Athan
Density altitude is the quiet performance-killer at any field: on a hot day the 163 ft field elevation of MOD St Athan can translate into a substantially higher density altitude, stretching take-off rolls and flattening climb rates — run the numbers rather than trusting the feel of a standard day. Expect published instrument procedures, controlled airspace and clearance requirements; slots and handling may apply to general aviation traffic.
This entry is one of 88 airports and airfields we list for United Kingdom — the country index on the airports hub links the rest. Coordinates above are given in both DMS and decimal degrees so they can go straight into a GPS, a flight planner or a chart plot without conversion.
Where this data comes from
The reference layer behind this page builds on the OurAirports dataset — a public-domain, community-maintained register of the world's airports that many flight planners and apps rely on — with equity records preserved from documented historical listings where the dataset is silent. Figures are carried as published: elevations as surveyed, coordinates as filed, runway dimensions as recorded. Nothing is estimated to fill a gap, and the whole layer regenerates from source on every site build, so corrections upstream arrive here automatically.
Frequently asked questions about MOD St Athan
What is the ICAO code of MOD St Athan?
The ICAO identifier of MOD St Athan is EGDX, and it has no IATA code assigned. The ICAO code is the one used in flight plans, METAR reports and aeronautical charts.
How high is MOD St Athan above sea level?
MOD St Athan sits at an elevation of 163 feet (50 metres) above mean sea level. Field elevation is the reference for pattern altitudes and for setting the altimeter on the ground.
Where exactly is MOD St Athan located?
The airport lies at 51.4052, -3.4333 — in St Athan, Vale of Glamorgan, Wales, United Kingdom, in the northern hemisphere. The closest listed field is Cardiff International Airport, about 6 km away.
Does EGSY publish METAR weather reports?
Where the station reports, the current METAR and TAF for EGSY appear on its live weather page on this site, refreshed continuously from the US NWS Aviation Weather Center feed.
How long is the runway at MOD St Athan?
MOD St Athan has one runway. The longest, 07/25, measures 5,997 ft (1828 m) with a ASP surface.