Zalduendo ULM (ES-0040)

Zalduendo ULM at a glance

Zalduendo ULM is a small airport / airfield in Zalduondo, Basque Country, Spain. The field elevation of 1,936 ft (590 m) is the number every arriving pilot dials against QNH — circuit heights and initial approach altitudes at ES-0040 are all figured from it. There is no scheduled airline service listed here — typical traffic is general aviation, training and local operations.

No runway records exist for this entry in the source dataset — common for fields whose operators never filed dimensions with the public dataset. The absence of a record says nothing about the runway on the ground: it may be paved, lighted and perfectly serviceable. Treat published charts, national AIP entries and the operator as the authoritative sources for runway data here, and this page as the identity and position reference for the field at Zalduondo. When the dataset gains a runway record for this field, the next site build picks it up automatically — the reference layer regenerates from source on every rebuild rather than being edited by hand.

Zalduendo ULM has no METAR station of its own, so the weather picture is assembled rather than read: take the current report and forecast from the nearest reporting airport — Vitoria Airport is the closest listed field, 32 km away — and treat it as the regional trend, not local truth. Terrain does the rest: a valley field can sit in fog while the reporting airport shows CAVOK, and wind bends around ridgelines in ways no distant anemometer captures. The honest sequence is the regional METAR for the go/no-go trend, then your own eyes at the field for the final call.

Flight-planning notes for Zalduendo ULM

Density altitude is the quiet performance-killer at any field: on a hot day the 1,936 ft field elevation of Zalduendo ULM 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. As with most small fields, the recorded details can lag reality — surfaces get resurfaced, thresholds move and operating hours change — so a call ahead to the field operator is part of the plan, not a courtesy.

This entry is one of 548 airports and airfields we list for Spain — 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.