Iruma Air Base (RJTJ)
Medium airport · Sayama, Tōkyō Prefecture, Japan
Airport data
| Name | Iruma Air Base |
|---|---|
| ICAO | RJTJ |
| Elevation | 295 ft (90 m) above mean sea level |
| Coordinates | N 35°50'31" E 139°24'40" 35.84190, 139.41100 |
| Location | Sayama, Tōkyō Prefecture, Japan |
| Scheduled service | No |
Runways
| Runway | Length | Width | Surface | Lighted |
|---|---|---|---|---|
| 17/35 | 6,562 ft (2000 m) | 148 ft | ASP | Yes |
Iruma Air Base at a glance
Iruma Air Base is a medium airport in Sayama, Tōkyō Prefecture, Japan. The field elevation of 295 ft (90 m) is the number every arriving pilot dials against QNH — circuit heights and initial approach altitudes at RJTJ 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, 17/35, offers 6,562 ft (2000 m) of asp surface, with runway lighting for night operations. Runway numbers give magnetic orientation: runway 17 points roughly 170° magnetic.
For the weather side of planning, the live METAR and TAF page for RJTJ 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 Iruma Air Base
Distances are great-circle, measured from the field reference point — planning distances along airways or roads will run longer.
| Airport | Code | Distance |
|---|---|---|
| Yokota Air Base | RJTY | 12 km (6 NM) |
| Chofu Airport | RJTF | 22 km (12 NM) |
| JMSDF Atsugi Air Base / Naval Air Facility Atsugi | RJTA | 43 km (23 NM) |
| Tokyo Haneda International Airport | RJTT | 47 km (25 NM) |
| JMSDF Shimofusa Air Base | RJTL | 54 km (29 NM) |
Flight-planning notes for Iruma Air Base
Density altitude is the quiet performance-killer at any field: on a hot day the 295 ft field elevation of Iruma Air Base 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 108 airports and airfields we list for Japan — 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 Iruma Air Base
What is the ICAO code of Iruma Air Base?
The ICAO identifier of Iruma Air Base is RJTJ, 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 Iruma Air Base above sea level?
Iruma Air Base sits at an elevation of 295 feet (90 metres) above mean sea level. Field elevation is the reference for pattern altitudes and for setting the altimeter on the ground.
Where exactly is Iruma Air Base located?
The airport lies at 35.8419, 139.4110 — in Sayama, Tōkyō Prefecture, Japan, in the northern hemisphere. The closest listed field is Yokota Air Base, about 12 km away.
Does RJTJ publish METAR weather reports?
Where the station reports, the current METAR and TAF for RJTJ 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 Iruma Air Base?
Iruma Air Base has one runway. The longest, 17/35, measures 6,562 ft (2000 m) with a ASP surface.