Jacksonville International to Cyril E King Airport JAX → STT
1,167 nautical miles (1,343 statute miles) southeast on a straight line, true course 125°, about 131° magnetic at the departure end (variation 6W). At 120 knots that is 8 h 20 min at the quickest height in today's winds (34,000 ft, a 20-knot tailwind), arriving about 3:53 pm AST (19:53 UTC). 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 E35E: thunderstorms (a convective SIGMET) up to 38,000 ft, moving from the west at 20 knots, until 8:55 am EDT (12:55 UTC). Over the route from 189 to 239 nm out.
as issued
WSUS31 KKCI 121055 MKCE WST 121055 CONVECTIVE SIGMET 35E VALID UNTIL 1255Z FL CSTL WTRS FROM 160E OMN-200ENE TRV-60ENE PBI-50ENE TRV-160E OMN 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 first 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 JAX.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
Not fetched just now.
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 eastbound cruising heights for this course (VFR: odd 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 (JAX, MLB, MIA). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 3,500 ft | 300° at 4 kt | −3 kt | 123 kt | 9 h 29 min | 5:02 pm AST (21:02 UTC) | |
| 5,500 ft | 280° at 4 kt | −3 kt | 123 kt | 9 h 29 min | 5:02 pm AST (21:02 UTC) | |
| 7,500 ft | 290° at 4 kt | −4 kt | 15 °C | 124 kt | 9 h 25 min | 4:58 pm AST (20:58 UTC) |
| 9,500 ft | 290° at 4 kt | −4 kt | 12 °C | 124 kt | 9 h 25 min | 4:58 pm AST (20:58 UTC) |
| 11,500 ft | 290° at 4 kt | −4 kt | 9 °C | 124 kt | 9 h 25 min | 4:58 pm AST (20:58 UTC) |
| 13,500 ft | 280° at 6 kt | −5 kt | 4 °C | 125 kt | 9 h 20 min | 4:53 pm AST (20:53 UTC) |
| 15,500 ft | 270° at 7 kt | −6 kt | 0 °C | 126 kt | 9 h 16 min | 4:49 pm AST (20:49 UTC) |
| 17,500 ft | 270° at 9 kt | −7 kt | -5 °C | 127 kt | 9 h 11 min | 4:44 pm AST (20:44 UTC) |
| 18,000 ft FL180 | 270° at 10 kt | −7 kt | -6 °C | 127 kt | 9 h 11 min | 4:44 pm AST (20:44 UTC) |
| 24,000 ft FL240 | 260° at 11 kt | −8 kt | -17 °C | 128 kt | 9 h 07 min | 4:40 pm AST (20:40 UTC) |
| 30,000 ft FL300 | 280° at 16 kt | −14 kt | -32 °C | 134 kt | 8 h 43 min | 4:16 pm AST (20:16 UTC) |
| 34,000 ft FL340 | 270° at 24 kt | −20 kt | -41 °C | 140 kt | 8 h 20 min | 3:53 pm AST (19:53 UTC) |
| 39,000 ft FL390 | 280° at 20 kt | −17 kt | -52 °C | 137 kt | 8 h 31 min | 4:04 pm AST (20:04 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| JAX | used from 0 nm out; 25 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° |
| MLB | used from 100 nm out; 86 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° |
| MIA | used from 299 nm out; 213 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° |
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 |
|---|---|---|---|---|---|---|---|
| JAX Jacksonville, FL | departure | no report just now | 29 ft | ||||
| SGJ St Augustine, FL | 30 nm out, 16 nm southwest of the line, tower | no report just now | 9 ft | ||||
| STT Charlotte Amalie, VI | destination | no report just now | 23 ft |
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 STT when you get there the forecast at the estimated arrival, 3:53 pm AST (19:53 UTC)
STT has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/8389 Jacksonville, FL, Thursday, October 15, 2026 through Sunday, October 18, 2026 UTC 7 nm from the route, at the departure 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 departure end · security · starts tomorrow · ZJX
- 6/2698 VIEQUES, PR, Monday, January 19, 2026 through Friday, December 18, 2026 UTC 19 nm from the route, at the destination end · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 18 December · ZSU
Daylight
Sunset at JAX 6:59 pm EDT (22:59 UTC), at STT 5:59 pm AST (21:59 UTC) (civil twilight ends 6:21 pm AST (22:21 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: Jacksonville International, Cyril E King Airport.