Plan a flight · Mon 10:54 am AST (14:54 UTC)

Cyril E King Airport to San Antonio International STT → SAT

1,949 nautical miles (2,242 statute miles) northwest on a straight line, true course 297°, about 310° magnetic at the departure end (variation 13W). At 120 knots that is 15 h 59 min at the quickest height in today's winds (4,500 ft, a 2-knot tailwind), arriving about 1:53 am CDT (06:53 UTC), after sunset at the destination. Right now STT is VFR, wind from the southeast (130°) at 10 knots; SAT is marginal VFR, wind from the east-southeast (110°) at 4 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: 1 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 C21C: thunderstorms (a convective SIGMET) up to 42,000 ft, moving from the southeast at 10 knots, until 11:55 am AST (15:55 UTC). Near the route, 1659 nm along the route.
as issued
```
WSUS32 KKCI 121355
MKCC WST 121355
CONVECTIVE SIGMET 21C
VALID UNTIL 1555Z
TX CSTL WTRS
FROM 70ESE PSX-120S LCH-190S LCH-90SE PSX-70ESE PSX
AREA TS MOV FROM 14010KT. TOPS TO FL420.
```

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

220 , 14 nm south, 9:20 am AST (13:20 UTC): moderate chop turbulence, remarks: zhu. 1809 nm along the route, 14 nm south of the line.
as filed, and in English
```
PSX UA /OV PSX080020/TM 1320/FL1302/TP 220/SK E145/TB OCNL MOD CHOP/RM ZHU
```
Report
a routine report filed through PSX
Where
20 nm east (080°) of PSX
Time
13:20 UTC
Height
at 130,200 ft
Aircraft
220
Sky
E145
Turbulence
occasional moderate chop
Remarks
zhu
E45X at 32,000 ft, 48 nm north, 8:05 am AST (12:05 UTC): moderate chop turbulence, remarks: zhu. At the destination end, 48 nm north of the line.
as filed, and in English
```
AUS UA /OV KCWK090015/TM 1205/FL320/TP E45X/TB MOD CHOP/RM ZHU
```
Report
a routine report filed through AUS
Where
15 nm east (090°) of KCWK
Time
12:05 UTC
Height
at 32,000 ft
Aircraft
E45X
Turbulence
moderate chop
Remarks
zhu
B738 at 36,000 ft, 18 nm northeast, 8:23 am AST (12:23 UTC): a routine report with nothing remarked on. At the departure end, 18 nm northeast of the line.
as filed, and in English
```
SJU UA /OV SJU044038/TM 1223/FL360/TP B738/SK TOPS FL400
```
Report
a routine report filed through SJU
Where
38 nm northeast (044°) of SJU
Time
12:23 UTC
Height
at 36,000 ft
Aircraft
B738
Sky
tops 40,000 ft
B763 at 9,000 ft, 18 nm south, 9:06 am AST (13:06 UTC): a broken layer up to 14,000 ft. 80 nm along the route, 18 nm south of the line.
as filed, and in English
```
SJU UA /OV SJU312023/TM 1306/FL090/TP B763/SK BKN-TOP 140
```
Report
a routine report filed through SJU
Where
23 nm northwest (312°) of SJU
Time
13:06 UTC
Height
at 9,000 ft
Aircraft
B763
Sky
a broken layer, tops 14,000 ft
A321 at 36,000 ft, 26 nm north, 9:45 am AST (13:45 UTC): no turbulence. 460 nm along the route, 26 nm north of the line.
as filed, and in English
```
MBPV UA /OV PVN019016/TM 1345/FL360/TP A321/TB NEG
```
Report
a routine report filed through MBPV
Where
16 nm north (019°) of PVN
Time
13:45 UTC
Height
at 36,000 ft
Aircraft
A321
Turbulence
none
C30J at 28,000 ft, 44 nm northeast, 10:22 am AST (14:22 UTC): no turbulence, clear from 28,000 ft to 60,000 ft. 580 nm along the route, 44 nm northeast of the line.
as filed, and in English
```
MBPV UA /OV PVN320120/TM 1422/FL280/TP C30J/SK SKC/TB NEG
```
Report
a routine report filed through MBPV
Where
120 nm northwest (320°) of PVN
Time
14:22 UTC
Height
at 28,000 ft
Aircraft
C30J
Sky
clear
Turbulence
none
B38M at 38,000 ft, 12 nm southwest, 10:16 am AST (14:16 UTC): no turbulence. 620 nm along the route, 12 nm southwest of the line.
as filed, and in English
```
MYNN UA /OV ZQA145200/TM 1416/FL380/TP B38M/TB NEG
```
Report
a routine report filed through MYNN
Where
200 nm southeast (145°) of ZQA
Time
14:16 UTC
Height
at 38,000 ft
Aircraft
B38M
Turbulence
none
ASTR at 41,000 ft, 45 nm north, 8:24 am AST (12:24 UTC): no turbulence. 690 nm along the route, 45 nm north of the line.
as filed, and in English
```
MYNN UA /OV ZQA136110/TM 1224/FL410/TP ASTR/TB NEG
```
Report
a routine report filed through MYNN
Where
110 nm southeast (136°) of ZQA
Time
12:24 UTC
Height
at 41,000 ft
Aircraft
ASTR
Turbulence
none
B38M at 32,000 ft, 11 nm north, 10:33 am AST (14:33 UTC): light chop turbulence above 32,000 ft. 809 nm along the route, 11 nm north of the line.
as filed, and in English
```
MYNN UA /OV ZQA220070/TM 1433/FL320/TP B38M/TB LGT CHOP 320
```
Report
a routine report filed through MYNN
Where
70 nm southwest (220°) of ZQA
Time
14:33 UTC
Height
at 32,000 ft
Aircraft
B38M
Turbulence
light chop at 32,000 ft
B738 at 26,000 ft, 43 nm north, 10:07 am AST (14:07 UTC): no turbulence above 26,000 ft. 889 nm along the route, 43 nm north of the line.
as filed, and in English
```
MIA UA /OV ZBV180040/TM 1407/FL260/TP B738/TB NEG 260
```
Report
a routine report filed through MIA
Where
40 nm south (180°) of ZBV
Time
14:07 UTC
Height
at 26,000 ft
Aircraft
B738
Turbulence
no at 26,000 ft
B738 at 25,000 ft, 43 nm north, 8:30 am AST (12:30 UTC): no turbulence. 889 nm along the route, 43 nm north of the line.
as filed, and in English
```
MIA UA /OV ZBV180040/TM 1230/FL250/TP B738/TB NEG
```
Report
a routine report filed through MIA
Where
40 nm south (180°) of ZBV
Time
12:30 UTC
Height
at 25,000 ft
Aircraft
B738
Turbulence
none
B38M at 20,000 ft, 46 nm north, 9:21 am AST (13:21 UTC): no turbulence, remarks: during the climb. 999 nm along the route, 46 nm north of the line.
as filed, and in English
```
MIA UA /OV DHP270045/TM 1321/FL200/TP B38M/TB NEG/RM DURC
```
Report
a routine report filed through MIA
Where
45 nm west (270°) of DHP
Time
13:21 UTC
Height
at 20,000 ft
Aircraft
B38M
Turbulence
none
Remarks
during the climb
A321 at 28,000 ft, 49 nm north, 10:04 am AST (14:04 UTC): light turbulence. 1049 nm along the route, 49 nm north of the line.
as filed, and in English
```
RSW UA /OV RSW210030/TM 1404/FL280/TP A321/TB LGT
```
Report
a routine report filed through RSW
Where
30 nm southwest (210°) of RSW
Time
14:04 UTC
Height
at 28,000 ft
Aircraft
A321
Turbulence
light
B739 at 34,000 ft, 28 nm north, 10:07 am AST (14:07 UTC): no turbulence, remarks: smooth zhu. 1759 nm along the route, 28 nm north of the line.
as filed, and in English
```
GLS UA /OV KVUH135158/TM 1407/FL340/TP B739/TB NEG/RM SMOOTH ZHU
```
Report
a routine report filed through GLS
Where
158 nm southeast (135°) of KVUH
Time
14:07 UTC
Height
at 34,000 ft
Aircraft
B739
Turbulence
none
Remarks
smooth zhu

15 more routine reports are on the map.

Winds aloft along the route, and the time en route the forecast for use 14:00–21:00 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 9 forecast points nearest it (MIA, EYW, PIE, MOB, MSY, LCH, HOU, PSX, SAT). 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	150° at 3 kt	−2 kt		122 kt	15 h 59 min	1:53 am CDT (06:53 UTC)
6,500 ft	150° at 3 kt	−2 kt	16 °C	122 kt	15 h 59 min	1:53 am CDT (06:53 UTC)
8,500 ft	180° at 2 kt	−1 kt	14 °C	121 kt	16 h 06 min	2:00 am CDT (07:00 UTC)
10,500 ft	210° at 2 kt	+1 kt	10 °C	119 kt	16 h 23 min	2:17 am CDT (07:17 UTC)
12,500 ft	250° at 2 kt	+2 kt	7 °C	118 kt	16 h 31 min	2:25 am CDT (07:25 UTC)
14,500 ft	270° at 4 kt	+3 kt	2 °C	117 kt	16 h 39 min	2:33 am CDT (07:33 UTC)
16,500 ft	280° at 5 kt	+5 kt	-2 °C	115 kt	16 h 57 min	2:51 am CDT (07:51 UTC)
18,000 ft FL180	280° at 6 kt	+6 kt	-6 °C	114 kt	17 h 06 min	3:00 am CDT (08:00 UTC)
24,000 ft FL240	280° at 10 kt	+10 kt	-17 °C	110 kt	17 h 43 min	3:37 am CDT (08:37 UTC)
30,000 ft FL300	270° at 15 kt	+13 kt	-31 °C	107 kt	18 h 13 min	4:07 am CDT (09:07 UTC)
34,000 ft FL340	270° at 16 kt	+14 kt	-41 °C	106 kt	18 h 23 min	4:17 am CDT (09:17 UTC)
39,000 ft FL390	280° at 14 kt	+12 kt	-52 °C	108 kt	18 h 03 min	3:57 am CDT (08:57 UTC)

Based on data from the 12th at 12:00 UTC; valid on the 12th at 18:00 UTC for use 14:00 to 21:00 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°	250/6 -6°	260/10 -18°	240/23 -32°	240/29 -41°	240/29 -52°
EYW	used from 949 nm out; 47 nm from the line	060/7	050/7 17°	040/6 13°	L/V 8°	L/V -6°	290/10 -17°	240/21 -31°	240/28 -41°	240/28 -52°
PIE	used from 1149 nm out; 148 nm from the line	360/14	010/20 18°	320/11 13°	290/16 8°	340/11 -6°	350/21 -17°	360/39 -32°	010/39 -42°	350/17 -50°
MOB	used from 1299 nm out; 242 nm from the line	L/V	L/V 18°	L/V 11°	300/9 6°	330/12 -4°	330/12 -16°	340/28 -30°	340/36 -40°	360/34 -51°
MSY	used from 1349 nm out; 214 nm from the line	170/11	160/13 18°	150/8 12°	L/V 6°	310/12 -5°	290/11 -15°	340/27 -30°	350/32 -40°	360/30 -52°
LCH	used from 1599 nm out; 121 nm from the line	170/9	180/18 18°	190/13 13°	190/6 8°	270/11 -6°	290/20 -13°	320/21 -30°	350/23 -40°	360/25 -51°
HOU	used from 1699 nm out; 78 nm from the line	160/21	180/12 17°	210/11 13°	200/7 8°	280/7 -5°	260/19 -13°	290/16 -30°	340/15 -40°	010/27 -51°
PSX	used from 1799 nm out; 21 nm from the line	180/20	180/15 17°	180/13 14°	180/9 9°	310/11 -5°	240/7 -14°	250/5 -29°	220/6 -39°	030/19 -51°
SAT	used from 1899 nm out; 25 nm from the line	160/12	180/23 18°	190/21 14°	200/12 10°	240/19 -5°	220/19 -14°	210/8 -29°	090/9 -39°	050/21 -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: scattered clouds at 2,900 feet, scattered clouds at 3,700 feet	from the southeast (130°) at 10 knots	10+ mi	none	23 ft	9:53 am AST (13:53 UTC)
SJU San Juan, PR	60 nm out, 21 nm south of the line, tower	VFR Sky: a few clouds at 2,500 feet, scattered clouds at 3,500 feet, scattered clouds at 4,500 feet	from the east (080°) at 12 knots	10+ mi	none	9 ft	13:56 UTC
MBPV Providenciales,	460 nm out, 11 nm northeast of the line, tower	VFR Sky: scattered clouds at 1,500 feet	from the east-northeast (070°) at 8 knots	6+ mi	none	13 ft	14:00 UTC
MTH Marathon, FL	979 nm out, 10 nm south of the line	VFR Sky: a broken layer at 6,500 feet	from the northeast (040°) at 7 knots	10+ mi	6,500 ft	7 ft	13:53 UTC
BAZ New Braunfels, TX	1929 nm out, 15 nm north of the line, tower	VFR Sky: a few clouds at 1,200 feet, a broken layer at 3,500 feet, a broken layer at 4,200 feet	from the southeast (130°) at 5 knots	10+ mi	3,500 ft	658 ft	14:51 UTC
SAT San Antonio, TX	destination	marginal VFR Sky: a broken layer at 1,300 feet, a broken layer at 2,100 feet, overcast at 2,600 feet	from the east-southeast (110°) at 4 knots	10+ mi	1,300 ft	809 ft	8:51 am CDT (13:51 UTC)

The highest airport on this list sits at 809 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At SAT when you get there the forecast at the estimated arrival, 1:53 am CDT (06:53 UTC)

Wind from the south-southeast at 9 knots, visibility more than 6 miles, overcast at 1,500 feet marginal VFR

The whole forecast for SAT

From Mon 7:00 am CDT (12:00 UTC): wind from the east-southeast at 5 knots, visibility more than 6 miles, a broken layer at 1,500 feet
At times between Mon 8:00 am CDT (13:00 UTC) and 11:00 am CDT (16:00 UTC): a broken layer at 2,500 feet
From Mon 12:00 pm CDT (17:00 UTC): wind from the south-southeast at 12 knots, visibility more than 6 miles, a broken layer at 3,500 feet
From Tue 1:00 am CDT (06:00 UTC): wind from the south-southeast at 9 knots, visibility more than 6 miles, overcast at 1,500 feet
At times between Tue 4:00 am CDT (09:00 UTC) and 7:00 am CDT (12:00 UTC): a broken layer at 800 feet

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 16 nm from the route, at the departure end · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 18 December · ZSU

Daylight

Sunset at STT 5:59 pm AST (21:59 UTC), at SAT 7:05 pm CDT (00:05 UTC) (civil twilight ends 7:29 pm CDT (00:29 UTC)). At 120 knots the arrival at SAT is before sunrise there (7:34 am CDT (12:34 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

Radar now, the Caribbean · loop National Weather Service

Radar now, the Southeast · loop National Weather Service

Radar now, the southern Plains · loop National Weather Service

Radar, the whole country · loop National Weather Service

Surface analysis now Weather Prediction Center

Forecast chart, 12 hours ahead Weather Prediction Center

Forecast chart, 24 hours ahead Weather Prediction Center

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, San Antonio International.