Plan a flight · Mon 6:44 am EDT (10:44 UTC)

South Bend International to St. Louis Lambert International SBN → STL

257 nautical miles (296 statute miles) southwest on a straight line, true course 228°, about 233° magnetic at the departure end (variation 5W). At 120 knots that is 2 h 28 min at the quickest height in today's winds (8,500 ft, a 16-knot headwind), arriving about 8:12 am CDT (13:12 UTC). Right now SBN is VFR, wind calm; STL is VFR, wind from the southwest (230°) at 8 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

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 SBN.

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

A21N at 31,000 ft, 28 nm southeast, 6:33 am EDT (10:33 UTC): no turbulence, remarks: during the climb. 69 nm along the route, 28 nm southeast of the line.
as filed, and in English
```
LAF UA /OV BVT/TM 1033/FL310/TP A21N/TB NEG/RM DURC
```
Report
a routine report filed through LAF
Where
over BVT
Time
10:33 UTC
Height
at 31,000 ft
Aircraft
A21N
Turbulence
none
Remarks
during the climb

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 3 forecast points nearest it (JOT, SPI, 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
4,500 ft	250° at 24 kt	+21 kt		99 kt	2 h 36 min	8:20 am CDT (13:20 UTC)
6,500 ft	250° at 21 kt	+19 kt	14 °C	101 kt	2 h 33 min	8:17 am CDT (13:17 UTC)
8,500 ft	250° at 18 kt	+16 kt	10 °C	104 kt	2 h 28 min	8:12 am CDT (13:12 UTC)
10,500 ft	250° at 19 kt	+17 kt	8 °C	103 kt	2 h 30 min	8:14 am CDT (13:14 UTC)
12,500 ft	260° at 21 kt	+17 kt	5 °C	103 kt	2 h 30 min	8:14 am CDT (13:14 UTC)
14,500 ft	270° at 23 kt	+17 kt	1 °C	103 kt	2 h 30 min	8:14 am CDT (13:14 UTC)
16,500 ft	270° at 26 kt	+17 kt	-4 °C	103 kt	2 h 30 min	8:14 am CDT (13:14 UTC)
18,000 ft FL180	280° at 28 kt	+17 kt	-7 °C	103 kt	2 h 30 min	8:14 am CDT (13:14 UTC)
24,000 ft FL240	280° at 34 kt	+22 kt	-19 °C	98 kt	2 h 37 min	8:21 am CDT (13:21 UTC)
30,000 ft FL300	280° at 46 kt	+29 kt	-33 °C	91 kt	2 h 49 min	8:33 am CDT (13:33 UTC)
34,000 ft FL340	280° at 58 kt	+34 kt	-41 °C	86 kt	2 h 59 min	8:43 am CDT (13:43 UTC)
39,000 ft FL390	300° at 61 kt	+21 kt	-49 °C	99 kt	2 h 36 min	8:20 am CDT (13:20 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; 66 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; 69 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; 35 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°

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
SBN South Bend, IN	departure	VFR	calm	9 mi	none	798 ft	5:54 am EDT (09:54 UTC)
OXI Knox, IN	30 nm out, 7 nm southeast of the line	marginal VFR Weather: mist	from the south-southeast (160°) at 4 knots	4 mi	none	685 ft	10:35 UTC
RZL Rensselaer, IN	59 nm out, 7 nm southeast of the line	VFR	calm	10+ mi	none	698 ft	10:35 UTC
TIP Rantoul, IL	119 nm out, 6 nm southeast of the line	VFR	calm	10+ mi	none	737 ft	10:35 UTC
DEC Decatur, IL	158 nm out, 4 nm south of the line, tower	VFR	from the southwest (220°) at 8 knots	10+ mi	none	681 ft	09:54 UTC
SPI Springfield, IL	188 nm out, 24 nm northwest of the line, tower	VFR	from the south-southwest (200°) at 6 knots	10+ mi	none	597 ft	09:52 UTC
ALN Alton/St Louis, IL	237 nm out, 6 nm south of the line, tower	VFR	calm	10+ mi	none	543 ft	10:35 UTC
STL St Louis, MO	destination	VFR Sky: a few clouds at 25,000 feet	from the southwest (230°) at 8 knots	10+ mi	none	617 ft	4:51 am CDT (09:51 UTC)

The highest airport on this list sits at 798 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, 8:12 am CDT (13:12 UTC)

Wind from the southwest at 7 knots, visibility more than 6 miles, scattered clouds at 25,000 feet VFR

The whole forecast for STL

From Mon 4:00 am CDT (09:00 UTC): wind from the 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 south-southwest at 8 knots, visibility more than 6 miles, a few clouds at 25,000 feet

The forecast for SBN, the departure

From Mon 2:00 am EDT (06:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
At times between Mon 2:00 am EDT (06:00 UTC) and 5:00 am EDT (09:00 UTC): visibility 2 miles, mist
From Mon 6:00 am EDT (10:00 UTC): wind from the south at 8 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
From Mon 2:00 pm EDT (18:00 UTC): wind from the south-southwest at 12 knots, gusting to 20, visibility more than 6 miles, scattered clouds at 25,000 feet
From Mon 8:00 pm EDT (00:00 UTC): wind from the south-southwest at 9 knots, visibility more than 6 miles, scattered clouds at 10,000 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 SBN 7:09 pm EDT (23:09 UTC), at STL 6:27 pm CDT (23:27 UTC) (civil twilight ends 6:54 pm CDT (23:54 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 central Great Lakes · 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: South Bend International, St. Louis Lambert International.