Gary/Chicago International to San Antonio International GYY → SAT
903 nautical miles (1,039 statute miles) southwest on a straight line, true course 220°, about 222° magnetic at the departure end (variation 2W). At 120 knots that is 7 h 43 min at the quickest height in today's winds (39,000 ft, a 3-knot headwind), arriving about 4:42 pm CDT (21:42 UTC). Right now GYY is VFR, wind from the south-southwest (210°) at 6 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
- AIRMET TANGO 2W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Near the route, 288 nm along 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 GYY.
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 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 8 forecast points nearest it (JOT, SPI, 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 | 230° at 22 kt | +22 kt | 98 kt | 9 h 13 min | 6:12 pm CDT (23:12 UTC) | |
| 6,500 ft | 230° at 18 kt | +18 kt | 15 °C | 102 kt | 8 h 51 min | 5:50 pm CDT (22:50 UTC) |
| 8,500 ft | 230° at 17 kt | +16 kt | 13 °C | 104 kt | 8 h 41 min | 5:40 pm CDT (22:40 UTC) |
| 10,500 ft | 240° at 16 kt | +15 kt | 9 °C | 105 kt | 8 h 36 min | 5:35 pm CDT (22:35 UTC) |
| 12,500 ft | 250° at 16 kt | +14 kt | 6 °C | 106 kt | 8 h 31 min | 5:30 pm CDT (22:30 UTC) |
| 14,500 ft | 250° at 18 kt | +15 kt | 1 °C | 105 kt | 8 h 36 min | 5:35 pm CDT (22:35 UTC) |
| 16,500 ft | 250° at 21 kt | +17 kt | -3 °C | 103 kt | 8 h 46 min | 5:45 pm CDT (22:45 UTC) |
| 18,000 ft FL180 | 250° at 22 kt | +18 kt | -7 °C | 102 kt | 8 h 51 min | 5:50 pm CDT (22:50 UTC) |
| 24,000 ft FL240 | 260° at 26 kt | +19 kt | -17 °C | 101 kt | 8 h 56 min | 5:55 pm CDT (22:55 UTC) |
| 30,000 ft FL300 | 280° at 42 kt | +21 kt | -31 °C | 99 kt | 9 h 07 min | 6:06 pm CDT (23:06 UTC) |
| 34,000 ft FL340 | 280° at 45 kt | +18 kt | -40 °C | 102 kt | 8 h 51 min | 5:50 pm CDT (22:50 UTC) |
| 39,000 ft FL390 | 300° at 47 kt | +3 kt | -50 °C | 117 kt | 7 h 43 min | 4:42 pm CDT (21:42 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| JOT | used from 0 nm out; 23 nm from the line | 250/25 | 260/22 14° | 250/17 9° | 270/21 5° | 280/28 -8° | 280/36 -20° | 270/41 -35° | 280/57 -42° | 290/65 -50° |
| SPI | used from 99 nm out; 27 nm from the line | 260/28 | 250/22 15° | 250/14 9° | 260/20 6° | 280/27 -7° | 280/34 -19° | 280/48 -32° | 280/59 -41° | 300/60 -49° |
| STL | used from 198 nm out; 5 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° |
| SGF | used from 298 nm out; 78 nm from the line | 230/37 | 260/20 15° | 250/16 13° | 250/15 8° | 260/28 -7° | 250/31 -17° | 280/59 -31° | 280/59 -39° | 290/55 -50° |
| FSM | used from 446 nm out; 38 nm from the line | 230/33 | 260/23 15° | 240/23 11° | 230/18 8° | 230/20 -8° | 250/31 -17° | 280/51 -30° | 280/52 -39° | 300/47 -51° |
| DAL | used from 595 nm out; 83 nm from the line | 190/30 | 200/28 18° | 220/18 13° | 250/13 8° | 240/24 -6° | 270/20 -14° | 270/35 -29° | 290/34 -39° | 310/41 -51° |
| CLL | used from 744 nm out; 59 nm from the line | 180/24 | 170/21 19° | 180/10 14° | 230/7 8° | 230/16 -6° | 260/20 -13° | 290/23 -29° | 320/21 -39° | 340/35 -51° |
| SAT | used from 843 nm out; 35 nm from the line | 160/18 | 180/22 17° | 190/16 14° | 210/16 9° | 220/16 -5° | 200/11 -14° | 250/8 -29° | 330/8 -40° | 020/26 -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 |
|---|---|---|---|---|---|---|---|
| GYY Gary/Chicago, IN | departure | VFR | from the south-southwest (210°) at 6 knots | 10+ mi | none | 596 ft | 8:50 am CDT (13:50 UTC) |
| LOT Chicago/Romeoville, IL | 20 nm out, 23 nm northwest of the line, tower | VFR | from the south (190°) at 5 knots | 10+ mi | none | 679 ft | 13:45 UTC |
| BMI Bloomington/Normal, IL | 99 nm out, 9 nm northwest of the line, tower | VFR | from the south-southwest (200°) at 8 knots | 10+ mi | none | 871 ft | 13:56 UTC |
| STL St Louis, MO | 218 nm out, 3 nm southeast of the line, tower | VFR | from the southwest (220°) at 12 knots | 10+ mi | none | 617 ft | 13:51 UTC |
| TVB Cabool, MO | 347 nm out, 2 nm north of the line | no report just now | 1,220 ft | ||||
| BBG Branson, MO | 407 nm out, 23 nm northwest of the line, tower | VFR | from the south (180°) at 3 knots | 10+ mi | none | 1,302 ft | 11:45 UTC |
| MEZ Mena, AR | 536 nm out, 8 nm east of the line | VFR | from the west (260°) at 6 knots | 10+ mi | none | 1,079 ft | 13:55 UTC |
| LBR Clarksville, TX | 605 nm out, 6 nm east of the line | no report just now | 440 ft | ||||
| GVT Greenville, TX | 655 nm out, 17 nm northwest of the line, tower | VFR | from the south (170°) at 6 knots | 10+ mi | none | 534 ft | 13:35 UTC |
| CNW Waco, TX | 754 nm out, 11 nm west of the line, tower | marginal VFR Sky: a broken layer at 2,200 feet Weather: haze | from the southeast (130°) at 6 knots | 5 mi | 2,200 ft | 470 ft | 13:55 UTC |
| GTU Georgetown, TX | 823 nm out, 4 nm northwest of the line, tower | marginal VFR Sky: overcast at 1,200 feet | from the south-southeast (160°) at 5 knots | 10+ mi | 1,200 ft | 789 ft | 13:55 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 1,302 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, 4:42 pm CDT (21:42 UTC)
Wind from the south-southeast at 12 knots, visibility more than 6 miles, a broken layer at 3,500 feet 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 GYY, the departure
- From Mon 7:00 am CDT (12:00 UTC): wind from the south at 6 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
- From Mon 12:00 pm CDT (17:00 UTC): wind from the south-southwest at 12 knots, gusting to 23, visibility more than 6 miles, a few clouds at 25,000 feet
- From Mon 7:00 pm CDT (00:00 UTC): wind from the southwest at 12 knots, visibility more than 6 miles, a few clouds at 12,000 feet
- From Mon 11:00 pm CDT (04:00 UTC): wind from the southwest at 11 knots, visibility more than 6 miles, low-level wind shear, a few clouds at 10,000 feet
- From Tue 6:00 am CDT (11:00 UTC): wind from the west at 10 knots, visibility more than 6 miles, a few clouds at 20,000 feet
Temporary flight restrictions on the line or within 25 nm of it
- 6/0543 MCGREGOR, TX 18 nm from the route, 784 nm along the route · security · ZFW
Daylight
Sunset at GYY 6:13 pm CDT (23:13 UTC), at SAT 7:05 pm CDT (00:05 UTC) (civil twilight ends 7:29 pm CDT (00:29 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: Gary/Chicago International, San Antonio International.