Airports / Japan / RJTJ
Iruma Air Base.
Sayama, Japan · 295 ft elevation. A private-aviation gateway on the Bravo register.
4.4/5
Google rating
220 ratings
0
Operators based
295
Elevation ft
Google rating
Google reviews
Field elevation
Nearest alternate
Field standing
#8 / 106
Japan airports by Google rating
4.4★ across 220 Google ratings , ranked against 106 rated Japan fields.
6 nm
To the nearest alternate
Yokota Air Base (OKO), 6 fields within 50 nm.
Overview
Iruma Air Base (RJTJ) is a mid-sized airport serving Sayama, Japan. Field elevation is 295 feet above sea level. Free of scheduled airline operations, it serves business aviation, charter flights, and local general aviation.
While no charter operators list RJTJ as their home base, the field is reachable for repositioned charter aircraft from nearby bases. The closest alternate fields are Yokota Air Base (OKO, 6 nm), Chofu Airport (RJTF, 12 nm), and JMSDF Atsugi Air Base / Naval Air Facility Atsugi (NJA, 23 nm). The field has a single 6,562-foot paved runway, long enough for charter aircraft up to VIP airliners.
Trip costs from RJTJ are driven by the aircraft category flown and how far it must reposition. You may also see the field referenced as Johnson Air Base. Browse operators flying from the area or estimate a trip cost from RJTJ to plan your flight.
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Field capability
ICAO
RJTJ
IATA
n/a
FAA / Local
RJTJ
Elevation
295 ft
Coordinates
35.8419° N · 139.4110° E
Airspace
G · GolfClass G, GolfUncontrolled field, no tower. Pilots self-announce and sequence themselves on the common traffic advisory frequency.Source: FAA NASR class airspace
Size
Medium
Scheduled svc
No
Elevation vs Japan fields
state range 6–2,182 ft
At 295 ft, RJTJ sits higher than 76% of the 107 Japan fields on the register.
Runways & aircraft access
1 runway
longest 6,562 ft
- 17/356,562 ft × 148 ftAsphaltLighted
Which aircraft can operate here
vs longest paved runway 6,562 ft
RJTJ's 6,562 ft paved runway typically supports charter aircraft up to VIP airliners.
- Turboprop3,000 ft
- Light Jet3,500 ft
- Midsize Jet4,500 ft
- Super-Midsize Jet5,000 ft
- Heavy Jet5,500 ft
- VIP Airliner6,000 ft
Class minimums are sea-level planning rules of thumb. A specific aircraft's balanced-field length varies with weight, temperature, and field elevation. Confirm performance with the operator.
Access & alternates
Closest alternate fields by great-circle distance, every listing links to its own field brief.
- 6nmOKOYokota Air BaseFussa
- 12nmRJTFChofu AirportChofu
- 23nmNJAJMSDF Atsugi Air Base / Naval Air Facility AtsugiAyase / Yamato
- 25nmHNDTokyo Haneda International AirportTokyo
- 29nmRJTLJMSDF Shimofusa Air BaseMatsudo
- 36nmRJTKJGSDF Kisarazu AirfieldKisarazu
Location
Open the full mapRJTJ · Iruma Air Base · Sayama, Japan
Flight times from here
Approximate nonstop block times from RJTJ on a typical midsize charter jet. Faster classes trim these; add positioning and taxi for the real schedule.
| Destination | Distance | Block time |
|---|---|---|
| Anchorage (ANC) | 3,002 nm | 7h 23m |
| Honolulu (HNL) | 3,360 nm | 8h 13m |
| Seattle (SEA) | 4,165 nm | 10h 5m |
| San Francisco (SFO) | 4,479 nm | 10h 49m |
| Jackson Hole (JAC) | 4,695 nm | 11h 19m |
| Los Angeles (VNY) | 4,751 nm | 11h 27m |
| Salt Lake City (SLC) | 4,758 nm | 11h 28m |
| Las Vegas (LAS) | 4,814 nm | 11h 36m |
Common questions
- What size private jets can use RJTJ?
- Iruma Air Base's longest paved runway is 6,562 ft, which typically supports charter aircraft up to VIP airliners. Lighter classes (turboprops, light and midsize jets) operate comfortably; confirm exact performance for a specific tail with the operator, since balanced-field length shifts with weight, temperature, and elevation.
- What is the longest runway at RJTJ?
- Iruma Air Base has one runway; the longest measures 6,562 ft on a paved surface and is lit for night operations.
- What is the nearest major airport to RJTJ?
- The closest alternate is Yokota Air Base (OKO), about 6 nm away, followed by Chofu Airport (RJTF) at 12 nm. Operators often position aircraft between these fields depending on ramp space and availability.
- How long is a flight from RJTJ to major cities?
- Typical block times on a midsize jet: Anchorage about 7h 23m (3,002 nm), Honolulu about 8h 13m (3,360 nm), Seattle about 10h 5m (4,165 nm). Faster classes trim these times; add positioning and taxi for the real schedule.