Cyril E King Airport to Jacksonville International STT → JAX
1,167 nautical miles (1,343 statute miles) northwest on a straight line, true course 312°, about 325° magnetic at the departure end (variation 13W). At 120 knots that is 9 h 58 min at the quickest height in today's winds (4,500 ft, a 3-knot headwind), arriving about 6:16 pm EDT (22:16 UTC). Right now STT is VFR, wind from the east (100°) at 13 knots, gusting to 17; JAX is VFR, wind from the west (260°) at 5 knots. For planning, not a briefing: the legal preflight briefing comes from Flight Service (1-800-WX-BRIEF) or the FAA's own tools. Airlines fly this pair: 5 flights in the DOT's last twelve reported months, the route's page.
The route the straight line, the warnings crossed, restrictions, pilot reports and the airports along the way · click a mark for its words
Green, blue, red and purple airport dots are the flying conditions reported there now (VFR, marginal VFR, IFR, low IFR); grey means no report. Red areas are SIGMETs, orange areas AIRMETs, hatched red areas temporary flight restrictions. Map tiles: OpenFreeMap, data © OpenStreetMap contributors.
Warnings the route crosses SIGMETs and AIRMETs whose area the line passes through or comes within 25 nm of
- SIGMET E37E: thunderstorms (a convective SIGMET) up to 38,000 ft, moving from the west at 20 knots, until 9:55 am AST (13:55 UTC). Over the route from 928 to 977 nm out.
as issued
WSUS31 KKCI 121155 MKCE WST 121155 CONVECTIVE SIGMET 37E VALID UNTIL 1355Z FL CSTL WTRS FROM 220SE CHS-220ENE TRV-50ENE PBI-40ENE TRV-220SE CHS AREA TS MOV FROM 26020KT. TOPS TO FL380.
- AIRMET TANGO 2W: moderate turbulence above 18,000 ft from 30,000 ft to 41,000 ft. Over the last 100 nm of the route.
A SIGMET warns of weather hazardous to all aircraft; an AIRMET of weather that matters to small aircraft and to flying without instruments. "From 60 to 180 nm out" is measured along the route from STT.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
No pilot reports within 50 nautical miles of the line in the last three hours.
Winds aloft along the route, and the time en route the forecast for use 08:00–15:00 UTC · at 120 knots true airspeed
The westbound cruising heights for this course (VFR: even thousands plus 500 ft; above 18,000 ft the forecast levels), with the wind averaged along the line from the 3 forecast points nearest it (MIA, MLB, JAX). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 4,500 ft | 280° at 4 kt | +3 kt | 117 kt | 9 h 58 min | 6:16 pm EDT (22:16 UTC) | |
| 6,500 ft | 280° at 4 kt | +3 kt | 16 °C | 117 kt | 9 h 58 min | 6:16 pm EDT (22:16 UTC) |
| 8,500 ft | 290° at 4 kt | +4 kt | 14 °C | 116 kt | 10 h 04 min | 6:22 pm EDT (22:22 UTC) |
| 10,500 ft | 290° at 4 kt | +4 kt | 10 °C | 116 kt | 10 h 04 min | 6:22 pm EDT (22:22 UTC) |
| 12,500 ft | 280° at 5 kt | +4 kt | 7 °C | 116 kt | 10 h 04 min | 6:22 pm EDT (22:22 UTC) |
| 14,500 ft | 270° at 6 kt | +5 kt | 2 °C | 115 kt | 10 h 09 min | 6:27 pm EDT (22:27 UTC) |
| 16,500 ft | 270° at 8 kt | +6 kt | -2 °C | 114 kt | 10 h 14 min | 6:32 pm EDT (22:32 UTC) |
| 18,000 ft FL180 | 270° at 10 kt | +7 kt | -6 °C | 113 kt | 10 h 20 min | 6:38 pm EDT (22:38 UTC) |
| 24,000 ft FL240 | 260° at 11 kt | +7 kt | -17 °C | 113 kt | 10 h 20 min | 6:38 pm EDT (22:38 UTC) |
| 30,000 ft FL300 | 280° at 16 kt | +14 kt | -32 °C | 106 kt | 11 h 01 min | 7:19 pm EDT (23:19 UTC) |
| 34,000 ft FL340 | 270° at 23 kt | +19 kt | -41 °C | 101 kt | 11 h 33 min | 7:51 pm EDT (23:51 UTC) |
| 39,000 ft FL390 | 270° at 20 kt | +17 kt | -52 °C | 103 kt | 11 h 20 min | 7:38 pm EDT (23:38 UTC) |
Based on data from the 12th at 06:00 UTC; valid on the 12th at 12:00 UTC for use 08:00 to 15:00 UTC; temperatures above 24,000 ft are below zero. Heights are above sea level; a height is left out when the forecast has no wind for it over most of the line (the ground is higher). Ground speed is the airspeed less the headwind; the time en route is for the straight line and ignores climb, descent and routing around weather.
The forecast points as issued
| Point | From | 3,000 | 6,000 | 9,000 | 12,000 | 18,000 | 24,000 | 30,000 | 34,000 | 39,000 |
|---|---|---|---|---|---|---|---|---|---|---|
| MIA | used from 0 nm out; 937 nm from the line | L/V | L/V 17° | L/V 13° | L/V 8° | 270/6 -6° | 250/9 -17° | 290/17 -32° | 280/25 -41° | 280/21 -52° |
| MLB | used from 848 nm out; 188 nm from the line | 290/10 | 260/15 18° | 290/12 13° | 280/13 8° | 250/20 -7° | 260/18 -18° | 240/17 -32° | 250/20 -41° | 250/22 -52° |
| JAX | used from 1097 nm out; 45 nm from the line | 310/22 | 310/19 16° | 300/22 14° | 290/25 8° | 300/25 -7° | 300/24 -18° | 270/20 -33° | 260/25 -41° | 290/17 -51° |
The weather now: both ends and the airports along the way public airports with a weather report within 25 nm of the line, one for each stretch
| Airport | Where | Conditions | Wind | Visibility | Ceiling | Elevation | Reported |
|---|---|---|---|---|---|---|---|
| STT Charlotte Amalie, VI | departure | VFR Sky: a few clouds at 3,000 feet | from the east (100°) at 13 knots, gusting to 17 | 10+ mi | none | 23 ft | 7:53 am AST (11:53 UTC) |
| SGJ St Augustine, FL | 1137 nm out, 16 nm southwest of the line, tower | reported, no category | from the west (260°) at 6 knots | 10+ mi | none | 9 ft | 11:56 UTC |
| JAX Jacksonville, FL | destination | VFR | from the west (260°) at 5 knots | 10+ mi | none | 29 ft | 7:56 am EDT (11:56 UTC) |
The highest airport on this list sits at 29 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At JAX when you get there the forecast at the estimated arrival, 6:16 pm EDT (22:16 UTC)
Wind from the north-northwest at 7 knots, visibility more than 6 miles, a few clouds at 25,000 feet VFR
The whole forecast for JAX
- From Mon 8:00 am EDT (12:00 UTC): wind from the west at 7 knots, visibility more than 6 miles, a few clouds at 25,000 feet
- From Mon 10:30 am EDT (14:30 UTC): wind from the west-northwest at 10 knots, gusting to 15, visibility more than 6 miles, a few clouds at 3,500 feet, a few clouds at 25,000 feet
- From Mon 6:00 pm EDT (22:00 UTC): wind from the north-northwest at 7 knots, visibility more than 6 miles, a few clouds at 25,000 feet
- From Mon 9:00 pm EDT (01:00 UTC): wind calm, visibility more than 6 miles, clear skies
The forecast for STT, the departure
- From Mon 8:00 am AST (12:00 UTC): wind from the east at 8 knots, visibility more than 6 miles, showers nearby, scattered clouds at 3,000 feet
- From Mon 9:00 am AST (13:00 UTC): wind from the east-southeast at 12 knots, visibility more than 6 miles, showers nearby, a few clouds at 2,500 feet, scattered clouds at 3,500 feet
- From Mon 6:00 pm AST (22:00 UTC): wind from the east at 7 knots, visibility more than 6 miles, showers nearby, scattered clouds at 3,000 feet
Temporary flight restrictions on the line or within 25 nm of it
- 6/2698 VIEQUES, PR, Monday, January 19, 2026 through Friday, December 18, 2026 UTC 19 nm from the route, at the departure end · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 18 December · ZSU
- 6/8389 Jacksonville, FL, Thursday, October 15, 2026 through Sunday, October 18, 2026 UTC 7 nm from the route, at the destination end · air shows/sports · starts Thursday 15 October · ZJX
- 6/8902 MAYPORT, FL, Tuesday, October 13, 2026 through Saturday, October 17, 2026 Local 1 nm from the route, at the destination end · security · starts tomorrow · ZJX
Daylight
Sunset at STT 5:59 pm AST (21:59 UTC), at JAX 6:59 pm EDT (22:59 UTC) (civil twilight ends 7:23 pm EDT (23:23 UTC)).
Each restriction opens the FAA's own page with the exact area, heights and times. Ordinary notices to air missions (closed runways, lights out) are not shown: the FAA's notice search is not open to sites like this one at this time.
Radar and forecast charts for the regions crossed government pictures, the latest each time the page loads
Sources: the Aviation Weather Center's data service (SIGMETs, AIRMETs, graphical AIRMETs, pilot reports, winds and temperatures aloft, observations and terminal forecasts), the National Weather Service radar, the Weather Prediction Center's charts, the FAA's temporary flight restriction list and shapes, and the FAA's airport file for the positions, elevations and magnetic variation. Fetched when the page is viewed and kept a few minutes. Each leg is the straight line between its two airports; airways, terrain and airspace are not considered. The airports in detail: Cyril E King Airport, Jacksonville International.