Plan a flight · Mon 7:02 am CDT (12:02 UTC)

San Antonio International to Billings Logan International SAT → BIL

1,086 nautical miles (1,250 statute miles) northwest on a straight line, true course 337°, about 333° magnetic at the departure end (variation 4E). At 120 knots that is 8 h 14 min at the quickest height in today's winds (24,000 ft, a 12-knot tailwind), arriving about 2:16 pm MDT (20:16 UTC). Right now SAT is marginal VFR, wind from the east (100°) at 4 knots; BIL is marginal VFR, wind from the west-northwest (290°) 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). Over the route from 219 to 299 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft (due to mountain wave) from 34,000 ft to 43,000 ft. Over the route from 608 to 897 nm out.
AIRMET TANGO 1W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Over the route from 618 to 697 nm out.
AIRMET TANGO 2W: moderate turbulence below 18,000 ft (due to mountain wave) up to 22,000 ft. Over the route from 707 to 877 nm out.
AIRMET TANGO 1W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Over the route from 757 to 907 nm out.
AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Near the route, 857 nm along the route.
AIRMET SIERRA 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the last 149 nm of the route.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 149 nm of the route.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 956 to 1076 nm out.
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the last 0 nm of 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 SAT.

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

B737 at 1,800 ft, 5 nm southeast, 6:18 am CDT (11:18 UTC): remarks: KSAT base 1,800 ft, on top 3,500 ft. At the departure end, 5 nm southeast of the line.
as filed, and in English
```
SAT UA /OV SAT/TM 1118/FL018/TP B737/RM KSAT BASE 018, ON TOP 035
```
Report
a routine report filed through SAT
Where
over SAT
Time
11:18 UTC
Height
at 1,800 ft
Aircraft
B737
Remarks
KSAT base 1,800 ft, on top 3,500 ft
A320 at 2,300 ft, 5 nm southeast, 5:37 am CDT (10:37 UTC): remarks: KSAT base 2,300 ft, on top 4,000 ft. At the departure end, 5 nm southeast of the line.
as filed, and in English
```
SAT UA /OV SAT/TM 1037/FL023/TP A320/RM KSAT BASE 023, ON TOP 040
```
Report
a routine report filed through SAT
Where
over SAT
Time
10:37 UTC
Height
at 2,300 ft
Aircraft
A320
Remarks
KSAT base 2,300 ft, on top 4,000 ft
B737 at 38,000 ft, 3 nm north, 6:05 am CDT (11:05 UTC): light chop turbulence, wind 306° at 27 knots. 100 nm along the route, 3 nm north of the line.
as filed, and in English
```
BWD UA /OV SJT094066/TM 1105/FL380/TP B737/WV 306027KT/TB LGT CHOP CONS/RM AWC-WEB
```
Report
a routine report filed through BWD
Where
66 nm east (094°) of SJT
Time
11:05 UTC
Height
at 38,000 ft
Aircraft
B737
Wind
from 306° at 27 knots
Turbulence
light chop continuous
Remarks
B738 at 11,000 ft, 47 nm southwest, 6:42 am CDT (11:42 UTC): light chop turbulence, remarks: during the climb. 628 nm along the route, 47 nm southwest of the line.
as filed, and in English
```
COS UA /OV BRK172014/TM 1142/FL110/TP B738/TB LGT CHOP/RM DURC
```
Report
a routine report filed through COS
Where
14 nm south (172°) of BRK
Time
11:42 UTC
Height
at 11,000 ft
Aircraft
B738
Turbulence
light chop
Remarks
during the climb
B38M at 21,000 ft, 47 nm southwest, 6:24 am CDT (11:24 UTC): light to moderate chop turbulence, remarks: during the climb zdvwc. 717 nm along the route, 47 nm southwest of the line.
as filed, and in English
```
DEN UA /OV DEN277039/TM 1124/FL210/TP B38M/TB LGT-MOD CHOP BLO 180 NEG ABV 180/RM DURC. ZDVWC
```
Report
a routine report filed through DEN
Where
39 nm west (277°) of DEN
Time
11:24 UTC
Height
at 21,000 ft
Aircraft
B38M
Turbulence
light to moderate chop below 18,000 ft no above 18,000 ft
Remarks
during the climb zdvwc
B763 at 23,000 ft, 45 nm southwest, 5:26 am CDT (10:26 UTC): light chop turbulence, remarks: zdvwc. 717 nm along the route, 45 nm southwest of the line.
as filed, and in English
```
DEN UA /OV DEN278037/TM 1026/FL230/TP B763/TB OCNL LGT CHOP/RM ZDVWC
```
Report
a routine report filed through DEN
Where
37 nm west (278°) of DEN
Time
10:26 UTC
Height
at 23,000 ft
Aircraft
B763
Turbulence
occasional light chop
Remarks
zdvwc
CRJ2 at 24,000 ft, 29 nm southwest, 6:45 am CDT (11:45 UTC): no turbulence, remarks: ZDVWC-13. 747 nm along the route, 29 nm southwest of the line.
as filed, and in English
```
DEN UA /OV DEN314057/TM 1145/FL240/TP CRJ2/TB NEG/RM ZDVWC-13
```
Report
a routine report filed through DEN
Where
57 nm northwest (314°) of DEN
Time
11:45 UTC
Height
at 24,000 ft
Aircraft
CRJ2
Turbulence
none
Remarks
ZDVWC-13
CRJ2 at 19,000 ft, 45 nm southwest, 6:49 am CDT (11:49 UTC): no turbulence, remarks: ZDVWC-13. 757 nm along the route, 45 nm southwest of the line.
as filed, and in English
```
DEN UA /OV DEN304074/TM 1149/FL190/TP CRJ2/TB NEG/RM ZDVWC-13
```
Report
a routine report filed through DEN
Where
74 nm northwest (304°) of DEN
Time
11:49 UTC
Height
at 19,000 ft
Aircraft
CRJ2
Turbulence
none
Remarks
ZDVWC-13
BE9L at 17,000 ft, 16 nm southwest, 4:42 am CDT (09:42 UTC): light rime icing from 15,000 ft to 17,000 ft, 0 °C, remarks: zdvwc. 907 nm along the route, 16 nm southwest of the line.
as filed, and in English
```
CPR UA /OV DDY250025/TM 0942/FL170/TP BE9L/TA 00/IC LGT RIME 150-170/RM ZDVWC
```
Report
a routine report filed through CPR
Where
25 nm west (250°) of DDY
Time
09:42 UTC
Height
at 17,000 ft
Aircraft
BE9L
Temperature
0 °C
Icing
light rime from 15,000 ft to 17,000 ft
Remarks
zdvwc

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 9 forecast points nearest it (SAT, ABI, LBB, AMA, PUB, DEN, BFF, LND, BIL). 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 21 kt	−7 kt	20 °C	127 kt	8 h 33 min	2:35 pm MDT (20:35 UTC)
6,500 ft	230° at 22 kt	−6 kt	18 °C	126 kt	8 h 37 min	2:39 pm MDT (20:39 UTC)
8,500 ft	250° at 22 kt	0	11 °C	120 kt	9 h 03 min	3:05 pm MDT (21:05 UTC)
10,500 ft	240° at 23 kt	−1 kt	8 °C	121 kt	8 h 59 min	3:01 pm MDT (21:01 UTC)
12,500 ft	230° at 25 kt	−4 kt	4 °C	124 kt	8 h 45 min	2:47 pm MDT (20:47 UTC)
14,500 ft	230° at 28 kt	−7 kt	0 °C	127 kt	8 h 33 min	2:35 pm MDT (20:35 UTC)
16,500 ft	230° at 32 kt	−9 kt	-5 °C	129 kt	8 h 25 min	2:27 pm MDT (20:27 UTC)
18,000 ft FL180	230° at 34 kt	−11 kt	-8 °C	131 kt	8 h 17 min	2:19 pm MDT (20:19 UTC)
24,000 ft FL240	230° at 43 kt	−12 kt	-19 °C	132 kt	8 h 14 min	2:16 pm MDT (20:16 UTC)
30,000 ft FL300	240° at 54 kt	−7 kt	-30 °C	127 kt	8 h 33 min	2:35 pm MDT (20:35 UTC)
34,000 ft FL340	240° at 53 kt	−1 kt	-37 °C	121 kt	8 h 59 min	3:01 pm MDT (21:01 UTC)
39,000 ft FL390	250° at 49 kt	+5 kt	-48 °C	115 kt	9 h 27 min	3:29 pm MDT (21:29 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
SAT	used from 0 nm out; 25 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°
ABI	used from 100 nm out; 60 nm from the line		200/30 19°	220/12 16°	220/11 9°	230/15 -5°	250/26 -15°	250/39 -28°	270/36 -38°	280/30 -51°
LBB	used from 249 nm out; 60 nm from the line		220/25 21°	230/20 15°	220/20 7°	230/36 -6°	240/50 -15°	240/59 -28°	260/52 -37°	260/45 -50°
AMA	used from 299 nm out; 56 nm from the line		230/32	230/28 14°	230/27 7°	230/38 -6°	230/50 -17°	250/69 -28°	260/62 -37°	270/65 -49°
PUB	used from 498 nm out; 95 nm from the line			260/45 11°	240/38 6°	230/47 -8°	230/51 -19°	240/74 -29°	240/82 -35°	250/72 -48°
DEN	used from 648 nm out; 25 nm from the line			270/24 11°	230/13 5°	230/48 -8°	230/46 -20°	230/63 -30°	240/78 -36°	240/78 -48°
BFF	used from 747 nm out; 80 nm from the line		280/28	260/39 11°	240/34 5°	210/38 -11°	210/52 -22°	230/61 -31°	230/61 -36°	240/56 -45°
LND	used from 847 nm out; 113 nm from the line			240/10 3°	240/30 0°	220/42 -13°	230/52 -23°	220/54 -33°	220/52 -36°	220/53 -44°
BIL	used from 996 nm out; 65 nm from the line		300/14	270/19 -2°	260/26 -2°	220/28 -13°	210/51 -25°	220/56 -33°	220/61 -39°	220/72 -45°

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 1,600 feet, a broken layer at 2,500 feet	from the east (100°) at 4 knots	10+ mi	1,600 ft	809 ft	6:51 am CDT (11:51 UTC)
ERV Kerrville, TX	40 nm out, 19 nm southwest of the line	marginal VFR Sky: a broken layer at 1,300 feet, overcast at 2,100 feet	from the south-southeast (160°) at 9 knots	10+ mi	1,300 ft	1,616 ft	11:55 UTC
ABI Abilene, TX	179 nm out, 12 nm northeast of the line, tower	VFR	from the south (170°) at 9 knots	10+ mi	none	1,790 ft	11:52 UTC
AMA Amarillo, TX	379 nm out, 11 nm southwest of the line, tower	VFR Sky: a broken layer at 12,000 feet	from the south-southwest (200°) at 13 knots	10+ mi	12,000 ft	3,606 ft	11:53 UTC
LIC Limon, CO	638 nm out, 9 nm northeast of the line	VFR	from the west-northwest (290°) at 5 knots	10+ mi	none	5,374 ft	11:55 UTC
CFO Denver, CO	687 nm out, 14 nm southwest of the line, tower	VFR	from the south-southwest (210°) at 14 knots	10+ mi	none	5,515 ft	11:55 UTC
CYS Cheyenne, WY	767 nm out, 13 nm east of the line, tower	VFR	from the north (350°) at 3 knots	10+ mi	none	6,159 ft	11:53 UTC
CPR Casper, WY	887 nm out, 6 nm west of the line, tower	VFR Sky: overcast at 5,500 feet	from the west-southwest (240°) at 9 knots	10+ mi	5,500 ft	5,344 ft	11:53 UTC
GEY Greybull, WY	1006 nm out, 21 nm west of the line	marginal VFR Sky: overcast at 1,300 feet	from the west-northwest (300°) at 10 knots	10+ mi	1,300 ft	3,941 ft	11:53 UTC
BIL Billings, MT	destination	marginal VFR Sky: a few clouds at 1,200 feet, overcast at 2,500 feet	from the west-northwest (290°) at 4 knots	10+ mi	2,500 ft	3,662 ft	5:53 am MDT (11:53 UTC)

The highest airport on this list sits at 6,159 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BIL when you get there the forecast at the estimated arrival, 2:16 pm MDT (20:16 UTC)

Wind light and variable, visibility more than 6 miles, scattered clouds at 1,500 feet, overcast at 2,500 feet marginal VFR

The whole forecast for BIL

From Mon 6:00 am MDT (12:00 UTC): wind from the north-northwest at 8 knots, visibility more than 6 miles, light rain snow, a broken layer at 1,200 feet, overcast at 2,200 feet
From Mon 1:00 pm MDT (19:00 UTC): wind light and variable, visibility more than 6 miles, scattered clouds at 1,500 feet, overcast at 2,500 feet
From Mon 6:00 pm MDT (00:00 UTC): wind from the east at 9 knots, visibility 6 miles, light drizzle, mist, a few clouds at 300 feet, overcast at 1,800 feet
From Mon 10:00 pm MDT (04:00 UTC): wind from the east at 9 knots, visibility 4 miles, light drizzle, mist, scattered clouds at 300 feet, overcast at 1,200 feet
From Tue 3:00 am MDT (09:00 UTC): wind light and variable, visibility 3 miles, light rain, mist, scattered clouds at 300 feet, a broken layer at 1,200 feet and more above

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

No temporary flight restriction on or near this route right now.

Daylight

Sunset at SAT 7:05 pm CDT (00:05 UTC), at BIL 6:32 pm MDT (00:32 UTC) (civil twilight ends 7:02 pm MDT (01:02 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 southern Rockies · loop National Weather Service

Radar now, the northern Rockies · 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, Billings Logan International.