St. Louis Lambert International to Luis Munoz Marin International STL → SJU
1,760 nautical miles (2,026 statute miles) southeast on a straight line, true course 127°, about 128° magnetic at the departure end (variation 1W). At 120 knots that is 11 h 58 min at the quickest height in today's winds (34,000 ft, a 27-knot tailwind), arriving about 6:03 pm AST (22:03 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: 63 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 E33E: thunderstorms (a convective SIGMET) up to 45,000 ft, moving from the west at 20 knots, until 6:55 am CDT (11:55 UTC). Over the route from 835 to 895 nm out.
as issued
WSUS31 KKCI 120955 MKCE WST 120955 CONVECTIVE SIGMET 33E VALID UNTIL 1155Z FL CSTL WTRS FROM 220SE CHS-230ENE TRV-90NE PBI-30NE TRV-220SE CHS AREA TS MOV FROM 26020KT. TOPS TO FL450. REF INTL SIGMET LIMA SERIES.
- AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist, fog). Over the route from 179 to 378 nm out.
- AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, mist). Over the route from 338 to 378 nm out.
- AIRMET TANGO 5W: moderate turbulence above 18,000 ft (due to mountain wave) from 29,000 ft to 40,000 ft. Over the route from 368 to 438 nm out.
- AIRMET TANGO 3W: moderate turbulence below 18,000 ft (due to mountain wave) up to 6,000 ft. Over the route from 368 to 428 nm out.
- AIRMET TANGO 2W: moderate turbulence above 18,000 ft from 28,000 ft to 41,000 ft. Over the route from 587 to 706 nm out.
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 STL.
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 13 forecast points nearest it (STL, CGI, EVV, BNA, TYS, ATL, GSP, CAE, SAV, CHS, 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 | 310° at 9 kt | −9 kt | 129 kt | 13 h 39 min | 7:44 pm AST (23:44 UTC) | |
| 5,500 ft | 310° at 9 kt | −9 kt | 129 kt | 13 h 39 min | 7:44 pm AST (23:44 UTC) | |
| 7,500 ft | 310° at 9 kt | −9 kt | 14 °C | 129 kt | 13 h 39 min | 7:44 pm AST (23:44 UTC) |
| 9,500 ft | 310° at 10 kt | −10 kt | 11 °C | 130 kt | 13 h 32 min | 7:37 pm AST (23:37 UTC) |
| 11,500 ft | 310° at 11 kt | −11 kt | 8 °C | 131 kt | 13 h 26 min | 7:31 pm AST (23:31 UTC) |
| 13,500 ft | 300° at 12 kt | −12 kt | 3 °C | 132 kt | 13 h 20 min | 7:25 pm AST (23:25 UTC) |
| 15,500 ft | 300° at 14 kt | −13 kt | -1 °C | 133 kt | 13 h 14 min | 7:19 pm AST (23:19 UTC) |
| 17,500 ft | 300° at 15 kt | −15 kt | -5 °C | 135 kt | 13 h 02 min | 7:07 pm AST (23:07 UTC) |
| 18,000 ft FL180 | 300° at 16 kt | −15 kt | -6 °C | 135 kt | 13 h 02 min | 7:07 pm AST (23:07 UTC) |
| 24,000 ft FL240 | 290° at 17 kt | −15 kt | -18 °C | 135 kt | 13 h 02 min | 7:07 pm AST (23:07 UTC) |
| 30,000 ft FL300 | 300° at 23 kt | −22 kt | -32 °C | 142 kt | 12 h 24 min | 6:29 pm AST (22:29 UTC) |
| 34,000 ft FL340 | 300° at 29 kt | −27 kt | -41 °C | 147 kt | 11 h 58 min | 6:03 pm AST (22:03 UTC) |
| 39,000 ft FL390 | 300° at 26 kt | −25 kt | -51 °C | 145 kt | 12 h 08 min | 6:13 pm AST (22:13 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| STL | used from 0 nm out; 25 nm from the line | 250/26 | 240/21 15° | 240/22 11° | 250/23 6° | 270/28 -7° | 260/30 -19° | 280/52 -31° | 280/57 -40° | 300/57 -49° |
| CGI | used from 50 nm out; 51 nm from the line | 260/22 | 250/15 15° | 250/13 11° | 250/16 6° | 270/29 -7° | 280/30 -18° | 290/40 -31° | 290/55 -40° | 300/51 -51° |
| EVV | used from 99 nm out; 49 nm from the line | 270/25 | 290/17 15° | 260/10 8° | 270/16 5° | 280/29 -6° | 280/33 -19° | 290/38 -33° | 300/53 -41° | 310/54 -51° |
| BNA | used from 149 nm out; 64 nm from the line | 300/20 | 300/14 15° | 300/14 10° | 300/13 4° | 310/22 -5° | 280/24 -18° | 310/37 -33° | 310/50 -41° | 320/49 -51° |
| TYS | used from 298 nm out; 59 nm from the line | 330/16 | 350/32 14° | 350/37 9° | 340/30 5° | 330/28 -6° | 340/36 -19° | 330/40 -33° | 330/51 -41° | 330/36 -51° |
| ATL | used from 398 nm out; 59 nm from the line | 330/32 | 340/36 17° | 350/34 10° | 340/25 6° | 330/27 -6° | 350/35 -18° | 330/49 -32° | 340/47 -41° | 340/27 -51° |
| GSP | used from 448 nm out; 74 nm from the line | 340/30 | 360/24 13° | 350/29 10° | 340/33 6° | 340/40 -7° | 350/44 -19° | 340/59 -31° | 350/55 -41° | 300/29 -50° |
| CAE | used from 497 nm out; 64 nm from the line | 340/17 | 330/15 12° | 320/22 9° | 320/31 5° | 330/35 -7° | 320/33 -19° | 340/40 -32° | 350/43 -39° | 320/35 -49° |
| SAV | used from 547 nm out; 33 nm from the line | 330/16 | 310/15 14° | 320/23 10° | 310/30 7° | 310/30 -6° | 300/28 -19° | 270/25 -32° | 300/25 -39° | 320/26 -50° |
| CHS | used from 696 nm out; 123 nm from the line | 330/14 | 300/17 14° | 320/21 9° | 310/26 6° | 310/32 -6° | 280/34 -19° | 260/37 -32° | 280/30 -39° | 310/30 -50° |
| JAX | used from 746 nm out; 166 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 796 nm out; 182 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 1044 nm out; 321 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 |
|---|---|---|---|---|---|---|---|
| STL St Louis, MO | departure | no report just now | 617 ft | ||||
| BLV Belleville, IL | 30 nm out, 6 nm north of the line, tower | no report just now | 459 ft | ||||
| MQY Smyrna, TN | 249 nm out, 16 nm southwest of the line, tower | no report just now | 543 ft | ||||
| AHN Athens, GA | 448 nm out, 9 nm southwest of the line, tower | no report just now | 812 ft | ||||
| HXD Hilton Head Island, SC | 617 nm out, 4 nm north of the line, tower | no report just now | 19 ft | ||||
| SJU San Juan, PR | destination | no report just now | 9 ft |
The highest airport on this list sits at 812 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At SJU when you get there the forecast at the estimated arrival, 6:03 pm AST (22:03 UTC)
SJU has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/0708 Goodlettsville, TN, Saturday, August 1, 2026 through Sunday, August 1, 2027 UTC 5 nm from the route, 229 nm along the route · security · until 1 August · ZME
- 6/4508 CEIBA, PR 24 nm from the route, at the destination end · security · ZSU
Daylight
Sunset at STL 6:27 pm CDT (23:27 UTC), at SJU 6:03 pm AST (22:03 UTC) (civil twilight ends 6:25 pm AST (22:25 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: St. Louis Lambert International, Luis Munoz Marin International.