St. Louis Lambert International to San Antonio International STL → SAT
683 nautical miles (787 statute miles) southwest on a straight line, true course 218°, about 219° magnetic at the departure end (variation 1W). At 120 knots that is 5 h 59 min at the quickest height in today's winds (39,000 ft, a 6-knot headwind), arriving about 6:30 am CDT (11:30 UTC), after sunset at the destination. Right now STL is VFR, wind from the south (180°) at 8 knots; SAT 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: 1,094 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
No SIGMET or AIRMET covers any part of this route right now.
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
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 02:00–09:00 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 6 forecast points nearest it (STL, SGF, FSM, DAL, CLL, 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 | 220° at 22 kt | +22 kt | 98 kt | 6 h 58 min | 7:29 am CDT (12:29 UTC) | |
| 6,500 ft | 230° at 20 kt | +20 kt | 16 °C | 100 kt | 6 h 50 min | 7:21 am CDT (12:21 UTC) |
| 8,500 ft | 230° at 18 kt | +17 kt | 13 °C | 103 kt | 6 h 38 min | 7:09 am CDT (12:09 UTC) |
| 10,500 ft | 240° at 16 kt | +15 kt | 10 °C | 105 kt | 6 h 30 min | 7:01 am CDT (12:01 UTC) |
| 12,500 ft | 240° at 16 kt | +14 kt | 7 °C | 106 kt | 6 h 27 min | 6:58 am CDT (11:58 UTC) |
| 14,500 ft | 240° at 17 kt | +15 kt | 2 °C | 105 kt | 6 h 30 min | 7:01 am CDT (12:01 UTC) |
| 16,500 ft | 240° at 18 kt | +16 kt | -2 °C | 104 kt | 6 h 34 min | 7:05 am CDT (12:05 UTC) |
| 18,000 ft FL180 | 240° at 18 kt | +16 kt | -6 °C | 104 kt | 6 h 34 min | 7:05 am CDT (12:05 UTC) |
| 24,000 ft FL240 | 250° at 22 kt | +18 kt | -16 °C | 102 kt | 6 h 42 min | 7:13 am CDT (12:13 UTC) |
| 30,000 ft FL300 | 280° at 33 kt | +15 kt | -30 °C | 105 kt | 6 h 30 min | 7:01 am CDT (12:01 UTC) |
| 34,000 ft FL340 | 280° at 36 kt | +15 kt | -40 °C | 105 kt | 6 h 30 min | 7:01 am CDT (12:01 UTC) |
| 39,000 ft FL390 | 300° at 37 kt | +6 kt | -51 °C | 114 kt | 5 h 59 min | 6:30 am CDT (11:30 UTC) |
Based on data from the 12th at 00:00 UTC; valid on the 12th at 06:00 UTC for use 02:00 to 09:00 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 | 250/24 | 250/24 16° | 260/23 9° | 270/16 6° | 260/25 -6° | 270/29 -19° | 290/34 -33° | 290/48 -41° | 290/54 -51° |
| SGF | used from 99 nm out; 68 nm from the line | 230/33 | 230/28 15° | 250/20 13° | 240/18 7° | 250/20 -6° | 250/24 -17° | 280/42 -31° | 280/49 -40° | 290/46 -51° |
| FSM | used from 198 nm out; 63 nm from the line | 210/27 | 250/23 16° | 250/20 13° | 240/17 8° | 250/18 -6° | 260/31 -16° | 280/42 -30° | 280/44 -40° | 290/38 -51° |
| DAL | used from 396 nm out; 67 nm from the line | 190/29 | 220/23 17° | 220/17 13° | 250/18 8° | 230/18 -5° | 240/18 -15° | 270/34 -29° | 280/33 -39° | 300/36 -51° |
| CLL | used from 545 nm out; 55 nm from the line | 170/22 | 170/26 18° | 200/15 14° | 240/13 8° | 240/15 -5° | 260/17 -13° | 290/27 -29° | 290/22 -40° | 320/30 -51° |
| SAT | used from 594 nm out; 64 nm from the line | 150/26 | 180/18 19° | 180/18 14° | 200/14 9° | 230/16 -6° | 210/9 -13° | 270/8 -29° | 280/6 -39° | 340/19 -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 |
|---|---|---|---|---|---|---|---|
| STL St Louis, MO | departure | VFR Sky: a few clouds at 25,000 feet | from the south (180°) at 8 knots | 10+ mi | none | 617 ft | 11:51 pm CDT (04:51 UTC) |
| UUV Sullivan, MO | 50 nm out, 10 nm northwest of the line | VFR | from the south-southwest (210°) at 6 knots | 10+ mi | none | 933 ft | 05:15 UTC |
| TVB Cabool, MO | 129 nm out, 5 nm northwest of the line | no report just now | 1,220 ft | ||||
| FLP Flippin, AR | 178 nm out, 7 nm southeast of the line | VFR | calm | 10+ mi | none | 719 ft | 04:56 UTC |
| RUE Russellville, AR | 248 nm out, 24 nm southeast of the line | VFR | from the east-northeast (060°) at 3 knots | 10+ mi | none | 409 ft | 04:53 UTC |
| MEZ Mena, AR | 317 nm out, 7 nm east of the line | VFR | variable at 3 knots | 10+ mi | none | 1,079 ft | 05:15 UTC |
| LBR Clarksville, TX | 386 nm out, 5 nm east of the line | no report just now | 440 ft | ||||
| GVT Greenville, TX | 436 nm out, 19 nm northwest of the line, tower | VFR | from the south (170°) at 7 knots | 10+ mi | none | 534 ft | 05:15 UTC |
| CNW Waco, TX | 535 nm out, 12 nm west of the line, tower | VFR | from the south-southeast (160°) at 7 knots | 10+ mi | none | 470 ft | 05:15 UTC |
| GTU Georgetown, TX | 604 nm out, 5 nm northwest of the line, tower | VFR | from the south-southeast (160°) at 9 knots | 10+ mi | none | 789 ft | 04:55 UTC |
| BAZ New Braunfels, TX | 664 nm out, 13 nm southeast of the line, tower | VFR | from the southeast (140°) at 5 knots | 10+ mi | none | 658 ft | 04:51 UTC |
| SAT San Antonio, TX | destination | VFR Sky: a few clouds at 25,000 feet | from the southeast (130°) at 10 knots | 10+ mi | none | 809 ft | 11:51 pm CDT (04:51 UTC) |
The highest airport on this list sits at 1,220 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, 6:30 am CDT (11:30 UTC)
Wind from the southeast at 6 knots, visibility more than 6 miles, overcast at 1,500 feet marginal VFR
The whole forecast for SAT
- From Mon 1:00 am CDT (06:00 UTC): wind from the southeast at 8 knots, visibility more than 6 miles, a few clouds at 1,500 feet, a few clouds at 25,000 feet
- From Mon 5:00 am CDT (10:00 UTC): wind from the southeast at 6 knots, visibility more than 6 miles, overcast at 1,500 feet
- From Mon 12:00 pm CDT (17:00 UTC): wind from the south-southeast at 12 knots, visibility more than 6 miles, showers nearby, a broken layer at 3,500 feet
- From Tue 2:00 am CDT (07:00 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 STL, the departure
- From Mon 1:00 am CDT (06:00 UTC): wind from the south-southwest at 7 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
- From Mon 11:00 am CDT (16:00 UTC): wind from the southwest at 12 knots, gusting to 20, visibility more than 6 miles, a few clouds at 25,000 feet
- From Mon 6:00 pm CDT (23:00 UTC): wind from the southwest at 8 knots, visibility more than 6 miles, a few clouds at 25,000 feet
Temporary flight restrictions on the line or within 25 nm of it
- 6/0543 MCGREGOR, TX 18 nm from the route, 565 nm along the route · security · ZFW
Daylight
Sunset at STL 6:27 pm CDT (23:27 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 (7:33 am CDT (12:33 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, San Antonio International.