Airports / Oklahoma / FSI
Henry Post Army Air Field.
Fort Sill, Oklahoma · 1,189 ft elevation. A private-aviation gateway on the Bravo register.
4.0/5
Google rating
12 ratings
0
Operators based
1,189
Elevation ft
Google rating
Google reviews
Field elevation
Nearest alternate
Field standing
5 nm
To the nearest alternate
Lawton Fort Sill Regional Airport (LAW), 4 fields within 50 nm.
Overview
Henry Post Army Air Field, listed as KFSI / FSI, is a mid-sized airport in Fort Sill, Oklahoma. Field elevation is 1,189 feet above sea level. Free of scheduled airline operations, it serves business aviation, charter flights, and local general aviation.
While no charter operators list FSI as their home base, the field is reachable for repositioned charter aircraft from nearby bases. The closest alternate fields are Lawton Fort Sill Regional Airport (LAW, 5 nm), Hobart Regional Airport (HBR, 38 nm), and Wichita Falls Municipal Airport / Sheppard Air Force Base (SPS, 40 nm). The field has a single 5,002-foot paved runway, long enough for charter aircraft up to super-midsize jets.
Trip costs from FSI are driven by the aircraft category flown and how far it must reposition. Browse operators flying from the area or estimate a trip cost from FSI to plan your flight.
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Field capability
ICAO
KFSI
IATA
FSI
FAA / Local
FSI
Elevation
1,189 ft
Coordinates
34.6498° N · 98.4022° W
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 OK fields
state range 451–3,123 ft
At 1,189 ft, FSI sits higher than 63% of the 52 Oklahoma fields on the register.
Runways & aircraft access
1 runway
longest 5,002 ft
- 18/365,002 ft × 150 ftConcreteLighted
Which aircraft can operate here
vs longest paved runway 5,002 ft
FSI's 5,002 ft paved runway typically supports charter aircraft up to super-midsize jets.
- 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.
- 5nmLAWLawton Fort Sill Regional AirportLawton
- 38nmHBRHobart Regional AirportHobart
- 40nmSPSWichita Falls Municipal Airport / Sheppard Air Force BaseWichita Falls
- 43nmLTSAltus Air Force BaseAltus
- 60nmOKCOKC Will Rogers World AirportOklahoma City
- 68nmTIKTinker Air Force BaseOklahoma City
Location
Open the full mapKFSI · Henry Post Army Air Field · Fort Sill, OK
Flight times from here
Approximate nonstop block times from FSI on a typical midsize charter jet. Faster classes trim these; add positioning and taxi for the real schedule.
| Destination | Distance | Block time |
|---|---|---|
| Dallas (DAL) | 133 nm | 43m |
| Austin (AUS) | 270 nm | 1h 2m |
| Houston (HOU) | 340 nm | 1h 11m |
| Denver (DEN) | 433 nm | 1h 24m |
| Aspen (ASE) | 490 nm | 1h 32m |
| Vail / Eagle (EGE) | 506 nm | 1h 35m |
| Nashville (BNA) | 580 nm | 1h 45m |
| Chicago (ORD) | 661 nm | 1h 56m |
Common questions
- What size private jets can use FSI?
- Henry Post Army Air Field's longest paved runway is 5,002 ft, which typically supports charter aircraft up to super-midsize jets. 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 FSI?
- Henry Post Army Air Field has one runway; the longest measures 5,002 ft on a paved surface and is lit for night operations.
- What is the nearest major airport to FSI?
- The closest alternate is Lawton Fort Sill Regional Airport (LAW), about 5 nm away, followed by Hobart Regional Airport (HBR) at 38 nm. Operators often position aircraft between these fields depending on ramp space and availability.
- How long is a flight from FSI to major cities?
- Typical block times on a midsize jet: Austin about 1h 2m (270 nm), Houston about 1h 11m (340 nm), Denver about 1h 24m (433 nm). Faster classes trim these times; add positioning and taxi for the real schedule.