K79S · Fort Benton Airport

FORT BENTON, MONTANA · SMALL AIRPORT

2,869

Elevation ft

Runways

4,300

Longest ft · 05/23

47.85N

110.64W

Fort Benton Airport serves Fort Benton, Montana at 2,869 ft elevation with its longest runway, 05/23, at 4,300 by 75 ft. The figures below are computed from FAA NASR runway data (via OurAirports) and the same rules of thumb JetDesk uses on the airport page in the app; the POH and current NOTAMs are the authority.

Open K79S in JetDesk: live METAR, TAF, winds and runway verdict →

01Runways

Runway	Length × width	Surface	Lighting
05/23	4,300 × 75 ft	asphalt	lit
14/32	1,700 × 75 ft	turf	unlit

02Density altitude and turboprop runway margins

Standard temperature at 2,869 ft is about 9°C. Every 1,000 ft of density altitude adds roughly 8 percent to a turboprop's takeoff distance and 5 percent to its landing distance. The table uses Piper Meridian book numbers (2,438 ft takeoff and 2,110 ft landing over a 50 ft obstacle at sea level, ISA, max weight) as a reference airplane; heavier turboprops and light jets scale the same way from their own POH figures.

Conditions	Density altitude	Takeoff est.	Landing est.	Landing × 1.5
Standard day (ISA, 9°C)	2,869 ft	2,998 ft	2,413 ft	3,619 ft
Warm day (ISA +10)	4,069 ft	3,232 ft	2,539 ft	3,809 ft
Hot day (ISA +20)	5,269 ft	3,466 ft	2,666 ft	3,999 ft
35°C afternoon	5,958 ft	3,600 ft	2,739 ft	4,108 ft

Planning aid only. Even on a 35°C afternoon the longest runway (05/23, 4,300 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (4,108 ft needed). The percentages are a generic rule of thumb applied to one reference airplane, not certified performance data for any specific aircraft, and the runway size categories describe the runway, not your airplane's suitability. Verify with the approved flight manual before every flight.

03Nearby fields with 5,000 ft or more

Useful as alternates, as fuel stops when the price at K79S is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KGTF Great Falls International Airport	37 nm SW	10,502 ft
KHVR Havre City County Airport	54 nm NE	5,205 ft
KCII Choteau Airport	62 nm W	5,000 ft
KSBX Shelby Airport	65 nm NW	5,005 ft
KLWT Lewistown Municipal Airport	67 nm SE	6,100 ft
K7S6 White Sulphur Springs Airport	81 nm S	6,100 ft

04Jet A prices and FBOs at K79S

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at K79S, the app flags a price stale after two weeks, and the route finder ranks every field within a corridor of your route by net savings after the cost of the extra cycle. Log a price at K79S or read what a fuel stop actually saves.

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