Plan a flight · Sun 7:54 pm MDT (01:54 UTC)

Boise Air Trml/Gowen Field to St. Louis Lambert International BOI → STL

1,199 nautical miles (1,379 statute miles) east on a straight line, true course 095°, about 082° magnetic at the departure end (variation 13E). At 120 knots that is 6 h 58 min at the quickest height in today's winds (39,000 ft, a 52-knot tailwind), arriving about 3:52 am CDT (08:52 UTC), after sunset at the destination. 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: 6 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 3W: thunderstorms (a convective SIGMET) up to 31,000 ft, moving from the southwest at 40 knots, until 8:55 pm MDT (02:55 UTC). Over the route from 330 to 479 nm out.
as issued
```
WSUS33 KKCI 120055
MKCW WST 120055
CONVECTIVE SIGMET 3W
VALID UNTIL 0255Z
MT WY
FROM 10WSW MLS-70E DDY-20N LAR-50E BPI-30NE BIL-10WSW MLS
AREA TS MOV FROM 22040KT. TOPS TO FL310.
```
AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the first 390 nm of the route.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the first 599 nm of the route.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 80 to 400 nm out.
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 route from 110 to 340 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 220 to 539 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 240 to 479 nm out.
AIRMET TANGO 3W: 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 809 to 1019 nm out.

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 BOI.

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

urgent CRJ2 at 7,000 ft, 25 nm north, 7:04 pm MDT (01:04 UTC): moderate turbulence, remarks: low-level wind shear dept RY03 gain/loss unknown. 430 nm along the route, 25 nm north of the line.
as filed, and in English
```
CPR UUA /OV CPR035002/TM 0104/FL070/TP CRJ2/TB CONT MOD TURB/RM LLWS DEPT RY03 GAIN/LOSS UNKN
```
Report
an urgent report filed through CPR
Where
2 nm northeast (035°) of CPR
Time
01:04 UTC
Height
at 7,000 ft
Aircraft
CRJ2
Turbulence
continuous moderate turbulence
Remarks
low-level wind shear dept RY03 gain/loss unknown
BE9L at 21,000 ft, 3 nm northwest, 5:22 pm MDT (23:22 UTC): light chop turbulence above 21,000 ft, moderate icing above 21,000 ft, -21 °C, remarks: zdvwc. 479 nm along the route, 3 nm northwest of the line.
as filed, and in English
```
DGW UA /OV IIP200020/TM 2322/FL210/TP BE9L/SK BASE 200/TA M21/TB OCNL LGT CHOP 210/IC MOD MIX 210/RM ZDVWC
```
Report
a routine report filed through DGW
Where
20 nm south (200°) of IIP
Time
23:22 UTC
Height
at 21,000 ft
Aircraft
BE9L
Sky
base 20,000 ft
Temperature
−21 °C
Turbulence
occasional light chop at 21,000 ft
Icing
moderate mix at 21,000 ft
Remarks
zdvwc
UAL1340 at 40,000 ft, 42 nm south, 6:18 pm MDT (00:18 UTC): moderate chop turbulence, wind 244° at 70 knots. 699 nm along the route, 42 nm south of the line.
as filed, and in English
```
ARP UAL1340 4046N 10049W 0018 F400 244/070KT TB OCNL MOD CHOP IC
```
Report
a routine report filed through ARP
CL60 descending, 2 nm southeast, 5:00 pm MDT (23:00 UTC): remarks: + 10 knots on final. At the departure end, 2 nm southeast of the line.
as filed, and in English
```
BOI UA /OV BOI/TM 2300/FLDURD/TP CL60/RM +/- 10 KTS ON FINAL
```
Report
a routine report filed through BOI
Where
over BOI
Time
23:00 UTC
Height
during the descent
Aircraft
CL60
Remarks
+ 10 knots on final
PC12 at 6,000 ft, 6 nm northeast, 7:09 pm MDT (01:09 UTC): scattered clouds up to 6,000 ft, remarks: multiple scattered layers during the descent RY31. 80 nm along the route, 6 nm northeast of the line.
as filed, and in English
```
SUN UA /OV KSUN/TM 0109/FL060/TP PC12/SK SCT-TOP060/WX FV05SM/RM MULTIPLE SCT LAYERS DURD RY31
```
Report
a routine report filed through SUN
Where
over KSUN
Time
01:09 UTC
Height
at 6,000 ft
Aircraft
PC12
Sky
scattered clouds, tops 6,000 ft
Weather
flight visibility 5 miles
Remarks
multiple scattered layers during the descent RY31
E550 at 21,000 ft, 6 nm northeast, 5:27 pm MDT (23:27 UTC): light turbulence, a few clouds above 7,000 ft, remarks: during the climb zlc. 80 nm along the route, 6 nm northeast of the line.
as filed, and in English
```
SUN UA /OV SUN/TM 2327/FL210/TP E550/SK FEW070/TB CONS LGT/RM DURC /ZLC
```
Report
a routine report filed through SUN
Where
over SUN
Time
23:27 UTC
Height
at 21,000 ft
Aircraft
E550
Sky
a few clouds from 7,000 ft
Turbulence
continuous light
Remarks
during the climb zlc
PC12 at 15,000 ft, 10 nm north, 5:47 pm MDT (23:47 UTC): light rime icing above 15,000 ft. 230 nm along the route, 10 nm north of the line.
as filed, and in English
```
JAC UA /OV JAC200025/TM 2347/FL150/TP PC12/IC LGT RIME 150 /ZLC
```
Report
a routine report filed through JAC
Where
25 nm south (200°) of JAC
Time
23:47 UTC
Height
at 15,000 ft
Aircraft
PC12
Icing
light rime at 15,000 ft zlc
A320 descending, 32 nm north, 6:54 pm MDT (00:54 UTC): overcast above 7,500 ft, remarks: braking action good during the descent RY19. 240 nm along the route, 32 nm north of the line.
as filed, and in English
```
JAC UA /OV JAC/TM 0054/FLUNKN/TP A320/SK OVC075/RM BRAKING ACTION GOOD DURD RY19
```
Report
a routine report filed through JAC
Where
over JAC
Time
00:54 UTC
Height
height not given
Aircraft
A320
Sky
overcast from 7,500 ft
Remarks
braking action good during the descent RY19
CRJ7 at 17,000 ft, 6 nm northwest, 5:03 pm MDT (23:03 UTC): light rime icing, -6 °C. 250 nm along the route, 6 nm northwest of the line.
as filed, and in English
```
JAC UA /OV JAC160030/TM 2303/FL170/TP CRJ7/TA M6/IC LGT RIME /ZLC
```
Report
a routine report filed through JAC
Where
30 nm south (160°) of JAC
Time
23:03 UTC
Height
at 17,000 ft
Aircraft
CRJ7
Temperature
−6 °C
Icing
light rime zlc
CRJ2 at 9,000 ft, 11 nm north, 6:35 pm MDT (00:35 UTC): light chop turbulence, vmc, remarks: occasional moderate turbulence at at 15,000 ft. 420 nm along the route, 11 nm north of the line.
as filed, and in English
```
CPR UA /OV CPR215015/TM 0035/FL090/TP CRJ2/WX VMC/TB LGT CHOP/RM OCNL MOD TURB AT 150
```
Report
a routine report filed through CPR
Where
15 nm southwest (215°) of CPR
Time
00:35 UTC
Height
at 9,000 ft
Aircraft
CRJ2
Weather
visual conditions
Turbulence
light chop
Remarks
occasional moderate turbulence at at 15,000 ft
B752 at 35,000 ft, 16 nm southwest, 5:21 pm MDT (23:21 UTC): light to moderate turbulence, remarks: ZDVWC-33. 519 nm along the route, 16 nm southwest of the line.
as filed, and in English
```
CYS UA /OV CYS350045/TM 2321/FL350/TP B752/TB CONS LGT-MOD/RM ZDVWC-33
```
Report
a routine report filed through CYS
Where
45 nm north (350°) of CYS
Time
23:21 UTC
Height
at 35,000 ft
Aircraft
B752
Turbulence
continuous light to moderate
Remarks
ZDVWC-33
B789 at 40,000 ft, 44 nm south, 6:22 pm MDT (00:22 UTC): light to moderate clear-air turbulence, remarks: zdvwc. 679 nm along the route, 44 nm south of the line.
as filed, and in English
```
SNY UA /OV SNY088072/TM 0022/FL400/TP B789/TB OCNL LGT-MOD CAT /RM ZDVWC
```
Report
a routine report filed through SNY
Where
72 nm east (088°) of SNY
Time
00:22 UTC
Height
at 40,000 ft
Aircraft
B789
Turbulence
occasional light to moderate clear-air turbulence
Remarks
zdvwc
B789 at 40,000 ft, 44 nm south, 6:22 pm MDT (00:22 UTC): light to moderate clear-air turbulence, remarks: zdvwc. 689 nm along the route, 44 nm south of the line.
as filed, and in English
```
SNY UA /OV SNY088081/TM 0022/FL400/TP B789/TB OCNL LGT-MOD CAT/RM ZDVWC
```
Report
a routine report filed through SNY
Where
81 nm east (088°) of SNY
Time
00:22 UTC
Height
at 40,000 ft
Aircraft
B789
Turbulence
occasional light to moderate clear-air turbulence
Remarks
zdvwc

Winds aloft along the route, and the time en route the forecast for use 20:00–03:00 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 (BOI, PIH, LND, BFF, GRI, OMA, MKC, COU, STL). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
5,500 ft	200° at 13 kt	−1 kt	13 °C	121 kt	9 h 55 min	6:49 am CDT (11:49 UTC)
7,500 ft	210° at 17 kt	−4 kt	12 °C	124 kt	9 h 40 min	6:34 am CDT (11:34 UTC)
9,500 ft	220° at 20 kt	−8 kt	8 °C	128 kt	9 h 22 min	6:16 am CDT (11:16 UTC)
11,500 ft	220° at 22 kt	−10 kt	5 °C	130 kt	9 h 13 min	6:07 am CDT (11:07 UTC)
13,500 ft	220° at 25 kt	−12 kt	1 °C	132 kt	9 h 05 min	5:59 am CDT (10:59 UTC)
15,500 ft	220° at 28 kt	−15 kt	-4 °C	135 kt	8 h 53 min	5:47 am CDT (10:47 UTC)
17,500 ft	230° at 31 kt	−18 kt	-8 °C	138 kt	8 h 41 min	5:35 am CDT (10:35 UTC)
18,000 ft FL180	230° at 31 kt	−18 kt	-9 °C	138 kt	8 h 41 min	5:35 am CDT (10:35 UTC)
24,000 ft FL240	230° at 34 kt	−20 kt	-20 °C	140 kt	8 h 34 min	5:28 am CDT (10:28 UTC)
30,000 ft FL300	230° at 39 kt	−24 kt	-33 °C	144 kt	8 h 20 min	5:14 am CDT (10:14 UTC)
34,000 ft FL340	240° at 50 kt	−40 kt	-40 °C	160 kt	7 h 30 min	4:24 am CDT (09:24 UTC)
39,000 ft FL390	260° at 56 kt	−52 kt	-48 °C	172 kt	6 h 58 min	3:52 am CDT (08:52 UTC)

Based on data from the 11th at 18:00 UTC; valid on the 12th at 00:00 UTC for use 20:00 to 03:00 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
BOI	used from 0 nm out; 25 nm from the line		330/14 4°	230/5 -2°	220/20 -7°	210/37 -20°	200/59 -26°	200/67 -34°	210/73 -35°	220/62 -41°
PIH	used from 100 nm out; 43 nm from the line		270/10	270/13 1°	210/16 -2°	200/56 -11°	200/51 -23°	200/68 -33°	220/77 -37°	230/73 -44°
LND	used from 250 nm out; 56 nm from the line			180/33 10°	190/50 3°	210/59 -9°	200/50 -21°	190/41 -34°	230/55 -39°	240/65 -47°
BFF	used from 449 nm out; 92 nm from the line		120/24	180/31 13°	210/26 7°	230/25 -7°	240/41 -20°	230/52 -36°	250/56 -41°	260/57 -45°
GRI	used from 699 nm out; 85 nm from the line		210/31 19°	240/21 14°	240/17 6°	260/27 -7°	260/34 -18°	240/45 -32°	250/56 -40°	260/62 -51°
OMA	used from 849 nm out; 64 nm from the line	190/34	230/34 19°	250/25 12°	250/18 6°	250/22 -7°	250/28 -19°	260/34 -32°	260/39 -41°	280/56 -51°
MKC	used from 949 nm out; 59 nm from the line	200/28	220/30 16°	270/20 11°	280/22 7°	260/27 -6°	270/27 -18°	280/38 -32°	270/38 -40°	280/50 -52°
COU	used from 1049 nm out; 51 nm from the line	210/16	220/19 15°	240/33 10°	250/29 7°	280/21 -6°	280/19 -18°	300/34 -31°	300/40 -42°	300/60 -52°
STL	used from 1149 nm out; 25 nm from the line	210/13	260/16 17°	270/21 10°	280/24 5°	310/20 -7°	320/22 -18°	320/44 -33°	320/59 -43°	310/69 -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	Elevation
BOI Boise, ID	departure	no report just now	2,871 ft
SUN Hailey, ID	80 nm out, 6 nm northeast of the line, tower	no report just now	5,319 ft
IDA Idaho Falls, ID	180 nm out, 17 nm north of the line, tower	no report just now	4,743 ft
LND Lander, WY	330 nm out, 2 nm southeast of the line	no report just now	5,588 ft
CPR Casper, WY	430 nm out, 23 nm north of the line, tower	no report just now	5,344 ft
GUR Guernsey, WY	509 nm out, 2 nm northeast of the line, tower	no report just now	4,401 ft
LBF North Platte, NE	699 nm out, 20 nm south of the line	no report just now	2,777 ft
GRI Grand Island, NE	809 nm out, 2 nm northeast of the line, tower	no report just now	1,847 ft
LNK Lincoln, NE	879 nm out, 16 nm north of the line, tower	no report just now	1,218 ft
STJ St Joseph, MO	979 nm out, 18 nm south of the line, tower	no report just now	826 ft
MYJ Mexico, MO	1129 nm out, 3 nm southwest of the line	no report just now	822 ft
STL St Louis, MO	destination	no report just now	617 ft

The highest airport on this list sits at 5,588 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At STL when you get there the forecast at the estimated arrival, 3:52 am CDT (08:52 UTC)

STL has no terminal forecast; use the nearest airport that does.

Temporary flight restrictions on the line or within 25 nm of it

6/7634 CENTRALIA, MO, Monday, October 12, 2026 UTC 9 nm from the route, 1109 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · today · ZKC

Daylight

Sunset at BOI 7:06 pm MDT (01:06 UTC), at STL 6:27 pm CDT (23:27 UTC) (civil twilight ends 6:54 pm CDT (23:54 UTC)). At 120 knots the arrival at STL is before sunrise there (7:07 am CDT (12:07 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 Pacific Northwest · loop National Weather Service

Radar now, the northern Rockies · loop National Weather Service

Radar now, the upper Mississippi valley · 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: Boise Air Trml/Gowen Field, St. Louis Lambert International.