Reference only — not for real-world navigation.
K4U6
Circle Town County Airport · Circle
Key Facts
Essential technical summary for MSFS 2020/2024 and X-Plane.
ILS Approach StatusILS DATA NOT IN DATABASE
Field Elevation
2,426 ft / 739 m
Transition Altitude
18,000 ft
Primary Channel
CTAF 122.80 MHz (CTAF)
Live Conversion
inHg
hPa
Flight Planning
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Welcome to the technical flight briefing for Circle Town County Airport (K4U6), located in Circle, United States. As a vital hub for Microsoft Flight Simulator 2024, MSFS 2020, and X-Plane pilots, this facility features 2 active runways with a maximum elevation of 2,426 ft. Please note that this field primarily supports VFR and visual approach procedures.Reference the data below for primary communication channels and detailed runway characteristics. Pilots should observe a Transition Altitude of 18,000 ft verified for this field for altimeter reset procedures.
Full Name
Circle Town County Airport
ICAO / IATA
K4U6 / —
Municipality
Circle
Country
Region
US-MT — Montana
GPS Coordinates
Transition Altitude
18,000 ft
Elevation
2,426 ft
Pilot Toolbox
External charts, live tracking and weather reports.
Runway 12 / 30
LIGHTED
Runway Length: 4,100 ft / 1,250 m
Runway Width: 75 ft / 23 m
Surface Type: ASPH-G
Heading: 138° / 318°
Runway Width: 75 ft / 23 m
Surface Type: ASPH-G
Heading: 138° / 318°
RWY 12 (138°)
No ILS / Visual Only
RWY 30 (318°)
No ILS / Visual Only
Runway 03 / 21
UNLIT
Runway Length: 2,500 ft / 762 m
Runway Width: 195 ft / 59 m
Surface Type: Grass
Heading: 48° / 228°
Runway Width: 195 ft / 59 m
Surface Type: Grass
Heading: 48° / 228°
RWY 03 (48°)
No ILS / Visual Only
RWY 21 (228°)
No ILS / Visual Only
CTAF CTAF
122.80 MHz
Base Airport Data: OurAirports (Public Domain)
Instrument Approach Data: AIP 2026 Researched · Cycle: Jan 2026