Airports / Montana / KEKS
Ennis Big Sky Airport.
Ennis, Montana · 5,423 ft elevation. A private-aviation gateway on the Bravo register.
KEKS
ICAO identifier
0
Operators based
5,423
Elevation ft
FBOs on field
Field elevation
Nearest alternate
Field standing
37 nm
To the nearest alternate
Bozeman Yellowstone International Airport (BZN), 2 fields within 50 nm.
Overview
Ennis Big Sky Airport (KEKS) is a general aviation field serving Ennis, Montana. Field elevation is 5,423 feet above sea level. Free of scheduled airline operations, it serves business aviation, charter flights, and local general aviation.
While no charter operators list KEKS as their home base, the field is reachable for repositioned charter aircraft from nearby bases. The closest alternate fields are Bozeman Yellowstone International Airport (BZN, 37 nm), Yellowstone Airport (WYS, 42 nm), and Bert Mooney Airport (BTM, 54 nm). The field has a single 7,600-foot paved runway, long enough for charter aircraft up to VIP airliners.
Trip costs from KEKS 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 KEKS to plan your flight.
1 FBO serves KEKS. Run one? Become the preferred FBO
Ramp services
FBOs on the field
Ascension FBO Network Ennis
Your FBO? Claim it, freeIn the heart of the world’s best fly-fishing country and just a bit off the beaten path to Yellowstone National Park, there is no better place to visit than Ennis, Montana. Being the closest airport to the resorts at Big Sky, we are set up to take care of your needs year around.
- Fuel
- Hangar
- Mon-Sun 08:00-17:00 (after-hours callout available)
- Unicom 122.8
- Conference room
- Wi-Fi
- Vending
- Courtesy car
- Shuttle
- Car rental
- Hangar
- Maintenance
- +9 more
- Phone
- Website
- Address
Directory data, unpaid. FBOs can take the Preferred slot above.
Field capability
ICAO
KEKS
IATA
n/a
FAA / Local
KEKS
Elevation
5,423 ft
Coordinates
45.2743° N · 111.6488° 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
Small
Scheduled svc
No
Elevation vs MT fields
state range 1,985–6,649 ft
At 5,423 ft, KEKS sits higher than 90% of the 31 Montana fields on the register, a high-elevation field where density altitude can trim aircraft performance on warm days.
Runways & aircraft access
1 runway
longest 7,600 ft
- 167,600 ft × 100 ftAsphaltLighted
Which aircraft can operate here
vs longest paved runway 7,600 ft
KEKS's 7,600 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, and at 5,423 ft this field's density altitude can extend the runway a jet actually needs on warm days. Confirm performance with the operator.
Access & alternates
Closest alternate fields by great-circle distance, every listing links to its own field brief.
- 37nmBZNBozeman Yellowstone International AirportBozeman
- 42nmWYSYellowstone AirportWest Yellowstone
- 54nmBTMBert Mooney AirportButte
- 57nmLVMMission FieldLivingston
- 81nmHLNHelena Regional AirportHelena
- 95nmSMNLemhi County AirportSalmon
Location
Open the full mapKEKS · Ennis Big Sky Airport · Ennis, MT
Flight times from here
Approximate nonstop block times from KEKS on a typical midsize charter jet. Faster classes trim these; add positioning and taxi for the real schedule.
| Destination | Distance | Block time |
|---|---|---|
| Salt Lake City (SLC) | 270 nm | 1h 2m |
| Vail / Eagle (EGE) | 398 nm | 1h 20m |
| Aspen (ASE) | 421 nm | 1h 23m |
| Denver (DEN) | 448 nm | 1h 27m |
| Seattle (SEA) | 460 nm | 1h 28m |
| Las Vegas (LAS) | 574 nm | 1h 44m |
| San Francisco (SFO) | 665 nm | 1h 57m |
| Scottsdale (SCF) | 700 nm | 2h 2m |
Common questions
- What size private jets can use KEKS?
- Ennis Big Sky Airport's longest paved runway is 7,600 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 KEKS?
- Ennis Big Sky Airport has one runway; the longest measures 7,600 ft on a paved surface and is lit for night operations.
- Which FBOs are at Ennis Big Sky Airport?
- One FBO serves KEKS: Ascension FBO Network Ennis. Phone, website, hours, unicom and services for each are listed on this page. Call ahead for fuel, ramp space, and ground handling.
- What is the nearest major airport to KEKS?
- The closest alternate is Bozeman Yellowstone International Airport (BZN), about 37 nm away, followed by Yellowstone Airport (WYS) at 42 nm. Operators often position aircraft between these fields depending on ramp space and availability.
- How long is a flight from KEKS to major cities?
- Typical block times on a midsize jet: Salt Lake City about 1h 2m (270 nm), Vail / Eagle about 1h 20m (398 nm), Aspen about 1h 23m (421 nm). Faster classes trim these times; add positioning and taxi for the real schedule.