Illinois Valley Airport (3S4), Oregon
Landing essentials
Whether you can land, whether you can refuel, and how customs works here.
Overview
Illinois Valley Airport, identifier 3S4, serves Cave Junction, Oregon, with a single paved runway at 1,394 feet elevation. FAA TFMSC data for 2025 shows the field handling a small volume of business aviation traffic, and there is no onsite customs service, with the nearest customs point at O33 roughly 83 nautical miles away. The field sits within general aviation reach of several nearby airports including Grants Pass, Brookings, and Rogue Valley International / Medford, and it draws frequent ultra-light activity alongside its recorded operations.
Runways
Illinois Valley Airport has one paved runway, 18/36, 4,807 ft long and 60 ft wide, with an asphalt surface.
Source: FAA Form 5010.
Fuel and airfield services
Fueling is available from 8am to 5pm, daily, and the airport has no control tower.
Source: FAA Form 5010 / NASR.
Customs
Illinois Valley Airport does not clear customs. The nearest port of entry is O33, 83 NM away.
Source: CBP list of ports of entry.
Business aviation traffic
Illinois Valley Airport recorded 9 business aviation movements in 2025. Traffic peaks in January. Business aviation traffic at 3S4 is concentrated in January, with activity dropping off sharply through the middle and later months of the year according to FAA TFMSC data.
Business jet movements, FAA TFMSC count. Peak month January, 7 movements in 2025.
Source: FAA TFMSC, business jet movements, 2025.
Climate
Weather station is 3.4 NM from the field. Some values are estimated by the agency. 1991–2020 climate normals.
Source: NOAA NCEI.
Operating constraints
Illinois Valley Airport has published operating constraints in two categories: runway notes and other notes.
REIL for runways 18 and 36, and MIRL for runway 18/36, are pilot-activated via CTAF.
Medium intensity runway lighting is set one foot off the runway edge.
Runway 18 has a 14:1 obstruction clearance slope based on the displaced threshold. A 15-foot road near the centerline, located 330 feet from the displaced threshold, has a 22:1 clearance slope.
Runway 36 is the designated calm wind runway.
The runway has basic markings with side stripes.
USFS (E94) weather station on field.
Frequent ultra-light aircraft activity occurs at the field.
For clearance delivery, contact Seattle ARTCC.
Brush up to 4 feet high is present in the primary surface area.
Source: FAA Chart Supplement.
Nearby airfields
Illinois Valley Airport has four airfields within 40 NM. The closest is Brookings (KBOK), 27.12 NM west.
Source: Skystar calculation from official coordinates.
Skystar at 3S4
We arrange catering, fuel and trip support here. Supplier prices reach you unchanged; our coordination fee sits on its own line.
The same order, priced two ways.
$1,200.00 catering order at 3S4.
Unchanged.
What the kitchen invoices us is what your quote reads.
One line, fixed.
It does not move with the size of the order.
At cost.
Passed on at the exact amount the processor took.
Market practice figures are industry averages, not a specific competitor.
Frequently asked questions
What kind of traffic does 3S4 Illinois Valley Airport see?
Illinois Valley Airport, local identifier 3S4, recorded 10 total annual operations in 2025 per FAA TFMSC data, with 9 attributed to business aviation. This places the field in a modest activity tier compared to nearby airports. Frequent ultra-light activity is also noted at the field, which pilots should factor in alongside the low overall operations count.
Is customs clearance available at 3S4?
No onsite customs service is listed for Illinois Valley Airport. The nearest customs facility is O33, located approximately 82.92 nautical miles away. Operators planning international arrivals should route through that facility rather than expecting clearance capability at 3S4 itself.
What is the runway configuration at Illinois Valley Airport (3S4)?
Illinois Valley Airport has a single paved runway, 18/36, measuring 4,807 feet long and 60 feet wide with an asphalt surface. Runway 36 is designated as the calm wind runway. Runway markings are basic with side stripes, and pilots should note obstruction clearance slopes reported for runway 18, including a road obstacle near the centerline at 330 feet.
When is Illinois Valley Airport (3S4) attended, and how is lighting activated?
Illinois Valley Airport keeps an attendance schedule of Monday through Friday, 0800 to 1700 local time. Runway edge lighting, MIRL on runway 18/36, and REIL on both runway ends are pilot-activated via CTAF outside those hours. The medium intensity runway lights are set one foot off the runway edge.