Plan a flight · Mon 9:38 am CDT (14:38 UTC)

San Antonio International to Cyril E King Airport SAT → STT

1,949 nautical miles (2,242 statute miles) east on a straight line, true course 103°, about 099° magnetic at the departure end (variation 4E). At 120 knots that is 14 h 33 min at the quickest height in today's winds (34,000 ft, a 14-knot tailwind), arriving about 1:11 am AST (05:11 UTC), after sunset at the destination. Right now SAT is marginal VFR, wind from the east-southeast (110°) at 4 knots; STT is VFR, wind from the southeast (130°) at 10 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 10:55 am CDT (15:55 UTC). Near the route, 290 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 SAT.

Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first

E45X at 32,000 ft, 48 nm north, 7:05 am CDT (12:05 UTC): moderate chop turbulence, remarks: zhu. At the departure 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
220 , 14 nm south, 8:20 am CDT (13:20 UTC): moderate chop turbulence, remarks: zhu. 140 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
GLF5 at 4,000 ft, 7 nm north, 9:07 am CDT (14:07 UTC): remarks: B-018 T-025. At the departure end, 7 nm north of the line.
as filed, and in English
```
SAT UA /OV SAT/TM 1407/FL040/TP GLF5/RM B-018 T-025
```
Report
a routine report filed through SAT
Where
over SAT
Time
14:07 UTC
Height
at 4,000 ft
Aircraft
GLF5
Remarks
B-018 T-025
C172 at 2,000 ft, 42 nm northwest, 8:31 am CDT (13:31 UTC): remarks: zhu. At the departure end, 42 nm northwest of the line.
as filed, and in English
```
ERV UA /OV ERV/TM 1331/FL020/TP C172/SK BASE 023/RM ZHU
```
Report
a routine report filed through ERV
Where
over ERV
Time
13:31 UTC
Height
at 2,000 ft
Aircraft
C172
Sky
base 2,300 ft
Remarks
zhu
F900 at 4,000 ft, 7 nm north, 8:15 am CDT (13:15 UTC): remarks: B018 T035. At the departure end, 7 nm north of the line.
as filed, and in English
```
SAT UA /OV SAT/TM 1315/FL040/TP F900/RM B018 T035
```
Report
a routine report filed through SAT
Where
over SAT
Time
13:15 UTC
Height
at 4,000 ft
Aircraft
F900
Remarks
B018 T035
B737 at 2,000 ft, 7 nm north, 7:15 am CDT (12:15 UTC): overcast from 2,000 ft to 3,800 ft. At the departure end, 7 nm north of the line.
as filed, and in English
```
SAT UA /OV SAT/TM 1215/FL020/TP B737/SK OVC020 TOP038
```
Report
a routine report filed through SAT
Where
over SAT
Time
12:15 UTC
Height
at 2,000 ft
Aircraft
B737
Sky
overcast from 2,000 ft, tops 3,800 ft
SR22 , 11 nm north, 8:48 am CDT (13:48 UTC): a broken layer above 1,600 ft. At the departure end, 11 nm north of the line.
as filed, and in English
```
BAZ UA /OV KBAZ170004/TM 1348/FLUNKN/TP SR22/SK BKN016-TOPUNKN
```
Report
a routine report filed through BAZ
Where
4 nm south (170°) of KBAZ
Time
13:48 UTC
Height
height not given
Aircraft
SR22
Sky
a broken layer from 1,600 ft, tops unknown
S22T , 19 nm north, 8:26 am CDT (13:26 UTC): a broken layer above 1,700 ft. At the departure end, 19 nm north of the line.
as filed, and in English
```
BAZ UA /OV KBAZ350004/TM 1326/FLUNKN/TP S22T/SK BKN017-TOPUNKN
```
Report
a routine report filed through BAZ
Where
4 nm north (350°) of KBAZ
Time
13:26 UTC
Height
height not given
Aircraft
S22T
Sky
a broken layer from 1,700 ft, tops unknown
G280 at 1,800 ft, 48 nm north, 8:35 am CDT (13:35 UTC): remarks: B018 T043. At the departure end, 48 nm north of the line.
as filed, and in English
```
AUS UA /OV 1335Z/TM 1335/FL018/TP G280/RM B018 T043
```
Report
a routine report filed through AUS
Where
1335Z
Time
13:35 UTC
Height
at 1,800 ft
Aircraft
G280
Remarks
B018 T043
B737 at 2,000 ft, 48 nm north, 7:25 am CDT (12:25 UTC): remarks: B020. At the departure end, 48 nm north of the line.
as filed, and in English
```
AUS UA /OV 1SW/TM 1225/FL020/TP B737/RM B020
```
Report
a routine report filed through AUS
Where
over 1SW
Time
12:25 UTC
Height
at 2,000 ft
Aircraft
B737
Remarks
B020
B738 at 23,000 ft, 48 nm north, 7:14 am CDT (12:14 UTC): light chop turbulence, remarks: zhu. At the departure end, 48 nm north of the line.
as filed, and in English
```
AUS UA /OV KCWK090040/TM 1214/FL230/TP B738/TB OCNL LGT CHOP/RM ZHU
```
Report
a routine report filed through AUS
Where
40 nm east (090°) of KCWK
Time
12:14 UTC
Height
at 23,000 ft
Aircraft
B738
Turbulence
occasional light chop
Remarks
zhu
B737 at 2,500 ft, 48 nm north, 7:05 am CDT (12:05 UTC): remarks: B025 T045. At the departure end, 48 nm north of the line.
as filed, and in English
```
AUS UA /OV 5N/TM 1205/FL025/TP B737/RM B025 T045
```
Report
a routine report filed through AUS
Where
5N
Time
12:05 UTC
Height
at 2,500 ft
Aircraft
B737
Remarks
B025 T045
B738 at 35,000 ft, 48 nm north, 6:58 am CDT (11:58 UTC): light chop turbulence, remarks: zhu. At the departure end, 48 nm north of the line.
as filed, and in English
```
AUS UA /OV KCWK/TM 1158/FL350/TP B738/TB INTMT LGT CHOP/RM ZHU
```
Report
a routine report filed through AUS
Where
over KCWK
Time
11:58 UTC
Height
at 35,000 ft
Aircraft
B738
Turbulence
intermittent light chop
Remarks
zhu
A320 at 4,000 ft, 45 nm north, 8:34 am CDT (13:34 UTC): remarks: during the climb. At the departure end, 45 nm north of the line.
as filed, and in English
```
AUS UA /OV 5 SE KAUS/TM 1334/FL040/TP A320/RM DURC
```
Report
a routine report filed through AUS
Where
5 southeast KAUS
Time
13:34 UTC
Height
at 4,000 ft
Aircraft
A320
Remarks
during the climb

12 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 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 9 forecast points nearest it (SAT, PSX, HOU, LCH, MSY, MOB, PIE, EYW, 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	150° at 3 kt	+2 kt		118 kt	16 h 31 min	3:09 am AST (07:09 UTC)
5,500 ft	150° at 3 kt	+2 kt		118 kt	16 h 31 min	3:09 am AST (07:09 UTC)
7,500 ft	160° at 2 kt	+1 kt	15 °C	119 kt	16 h 23 min	3:01 am AST (07:01 UTC)
9,500 ft	190° at 2 kt	0	12 °C	120 kt	16 h 14 min	2:52 am AST (06:52 UTC)
11,500 ft	230° at 2 kt	−1 kt	9 °C	121 kt	16 h 06 min	2:44 am AST (06:44 UTC)
13,500 ft	260° at 3 kt	−3 kt	4 °C	123 kt	15 h 51 min	2:29 am AST (06:29 UTC)
15,500 ft	270° at 4 kt	−4 kt	0 °C	124 kt	15 h 43 min	2:21 am AST (06:21 UTC)
17,500 ft	280° at 6 kt	−6 kt	-5 °C	126 kt	15 h 28 min	2:06 am AST (06:06 UTC)
18,000 ft FL180	280° at 6 kt	−6 kt	-6 °C	126 kt	15 h 28 min	2:06 am AST (06:06 UTC)
24,000 ft FL240	280° at 10 kt	−10 kt	-17 °C	130 kt	15 h	1:38 am AST (05:38 UTC)
30,000 ft FL300	270° at 15 kt	−13 kt	-31 °C	133 kt	14 h 39 min	1:17 am AST (05:17 UTC)
34,000 ft FL340	270° at 16 kt	−14 kt	-41 °C	134 kt	14 h 33 min	1:11 am AST (05:11 UTC)
39,000 ft FL390	280° at 14 kt	−12 kt	-52 °C	132 kt	14 h 46 min	1:24 am AST (05:24 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
SAT	used from 0 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°
PSX	used from 50 nm out; 54 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°
HOU	used from 150 nm out; 47 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°
LCH	used from 250 nm out; 101 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°
MSY	used from 350 nm out; 138 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°
MOB	used from 600 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°
PIE	used from 650 nm out; 205 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°
EYW	used from 799 nm out; 121 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°
MIA	used from 999 nm out; 74 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°

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
SAT San Antonio, TX	departure	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)
BAZ New Braunfels, TX	20 nm out, 15 nm north of the line, tower	marginal VFR Sky: scattered clouds at 1,200 feet, a broken layer at 2,200 feet, a broken layer at 3,500 feet	from the east-southeast (120°) at 3 knots	10+ mi	2,200 ft	658 ft	14:27 UTC
MTH Marathon, FL	969 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
MBPV Providenciales,	1489 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
MBGT Cockburn Town,	1559 nm out, 19 nm north of the line, tower	VFR Sky: a few clouds at 1,800 feet	from the east-southeast (110°) at 8 knots	6+ mi	none	11 ft	14:00 UTC
SJU San Juan, PR	1889 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
STT Charlotte Amalie, VI	destination	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)

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 STT when you get there the forecast at the estimated arrival, 1:11 am AST (05:11 UTC)

Wind from the east at 7 knots, visibility more than 6 miles, showers nearby, scattered clouds at 3,000 feet VFR

The whole forecast for STT

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

The forecast for SAT, the departure

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

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 destination end · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 18 December · ZSU

Daylight

Sunset at SAT 7:05 pm CDT (00:05 UTC), at STT 5:59 pm AST (21:59 UTC) (civil twilight ends 6:21 pm AST (22:21 UTC)). At 120 knots the arrival at STT is before sunrise there (6:13 am AST (10:13 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 southern Plains · loop National Weather Service

Radar now, the Southeast · loop National Weather Service

Radar now, the Caribbean · 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: San Antonio International, Cyril E King Airport.