Plan a flight · Mon 1:09 am CDT (06:09 UTC)

General Mitchell International to Luis Munoz Marin International MKE → SJU

1,843 nautical miles (2,121 statute miles) southeast on a straight line, true course 136°, about 140° magnetic at the departure end (variation 4W). At 120 knots that is 13 h 51 min at the quickest height in today's winds (24,000 ft, a 13-knot tailwind), arriving about 4:00 pm AST (20:00 UTC). Right now MKE is VFR, wind from the south-southwest (210°) at 8 knots; SJU is VFR, wind from the east-southeast (110°) at 6 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: 2 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 SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 70 to 498 nm out.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 379 to 508 nm out.
AIRMET TANGO 5W: moderate turbulence below 18,000 ft (due to mountain wave) up to 10,000 ft. Over the route from 458 to 588 nm out.
AIRMET TANGO 5W: moderate turbulence above 18,000 ft (due to mountain wave) from 29,000 ft to 40,000 ft. Near the route, 528 nm along the route.
AIRMET TANGO 1W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 817 to 817 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 MKE.

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

LJ45 at 10,000 ft, 9 nm northeast, 11:31 pm CDT (04:31 UTC): no turbulence, clear, remarks: ground fog at fwa FV10SM on final runway 14. 149 nm along the route, 9 nm northeast of the line.
as filed, and in English
```
FWA UA /OV OLK/TM 0431/FL100/TP LJ45/SK CLR/TB SMOOTH/RM GROUND FOG AT FWA. FV10SM ON FINAL RY 14
```
Report
a routine report filed through FWA
Where
over OLK
Time
04:31 UTC
Height
at 10,000 ft
Aircraft
LJ45
Sky
clear
Turbulence
smooth
Remarks
ground fog at fwa FV10SM on final runway 14
MD83 climbing, 39 nm northeast, 12:04 am CDT (05:04 UTC): a routine report with nothing remarked on. 289 nm along the route, 39 nm northeast of the line.
as filed, and in English
```
CMH UA /OV LCK/TM 0504/FLDURC/TP MD83/SK B010 T037
```
Report
a routine report filed through CMH
Where
over LCK
Time
05:04 UTC
Height
during the climb
Aircraft
MD83
Sky
B010 T037

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 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 (MKG, FWA, CMH, CRW, ROA, RDU, ILM, MLB, MIA). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
3,500 ft	280° at 10 kt	−7 kt		127 kt	14 h 31 min	4:40 pm AST (20:40 UTC)
5,500 ft	290° at 10 kt	−8 kt		128 kt	14 h 24 min	4:33 pm AST (20:33 UTC)
7,500 ft	290° at 11 kt	−9 kt	13 °C	129 kt	14 h 17 min	4:26 pm AST (20:26 UTC)
9,500 ft	280° at 12 kt	−9 kt	10 °C	129 kt	14 h 17 min	4:26 pm AST (20:26 UTC)
11,500 ft	270° at 12 kt	−8 kt	7 °C	128 kt	14 h 24 min	4:33 pm AST (20:33 UTC)
13,500 ft	270° at 14 kt	−8 kt	3 °C	128 kt	14 h 24 min	4:33 pm AST (20:33 UTC)
15,500 ft	270° at 17 kt	−9 kt	-1 °C	129 kt	14 h 17 min	4:26 pm AST (20:26 UTC)
17,500 ft	270° at 20 kt	−11 kt	-5 °C	131 kt	14 h 04 min	4:13 pm AST (20:13 UTC)
18,000 ft FL180	270° at 20 kt	−11 kt	-6 °C	131 kt	14 h 04 min	4:13 pm AST (20:13 UTC)
24,000 ft FL240	260° at 24 kt	−13 kt	-18 °C	133 kt	13 h 51 min	4:00 pm AST (20:00 UTC)
30,000 ft FL300	250° at 22 kt	−8 kt	-32 °C	128 kt	14 h 24 min	4:33 pm AST (20:33 UTC)
34,000 ft FL340	240° at 25 kt	−1 kt	-41 °C	121 kt	15 h 14 min	5:23 pm AST (21:23 UTC)
39,000 ft FL390	240° at 28 kt	−4 kt	-50 °C	124 kt	14 h 52 min	5:01 pm AST (21:01 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
MKG	used from 0 nm out; 64 nm from the line	260/22	290/16 15°	300/11 10°	290/5 3°	300/26 -9°	300/32 -20°	320/48 -36°	320/61 -45°	310/74 -53°
FWA	used from 100 nm out; 45 nm from the line	300/17	320/20 16°	330/20 10°	340/15 3°	310/27 -8°	320/37 -20°	330/52 -36°	330/65 -43°	330/60 -50°
CMH	used from 249 nm out; 49 nm from the line	330/15	340/22 14°	340/24 9°	340/23 4°	340/35 -9°	340/49 -20°	340/58 -37°	330/70 -42°	340/55 -47°
CRW	used from 349 nm out; 38 nm from the line	330/20	330/23 11°	340/25 8°	340/21 2°	340/33 -9°	340/41 -20°	330/42 -35°	320/44 -39°	320/43 -47°
ROA	used from 448 nm out; 55 nm from the line	310/29	330/31 13°	340/28 7°	330/25 3°	310/32 -8°	300/32 -22°	290/32 -31°	270/35 -38°	270/32 -47°
RDU	used from 548 nm out; 48 nm from the line	280/33	300/23 11°	300/28 8°	290/28 4°	260/41 -6°	240/52 -18°	230/66 -31°	230/76 -39°	240/52 -49°
ILM	used from 648 nm out; 32 nm from the line	270/22	270/23 11°	260/35 10°	240/41 6°	240/49 -5°	240/61 -16°	230/74 -30°	220/79 -40°	230/71 -51°
MLB	used from 1046 nm out; 364 nm from the line	230/6	230/12 17°	240/13 12°	240/14 7°	240/20 -5°	240/24 -16°	210/21 -32°	190/33 -41°	200/36 -52°
MIA	used from 1196 nm out; 441 nm from the line	150/7	140/5 17°	160/5 14°	L/V 9°	230/8 -5°	230/8 -17°	150/11 -32°	150/25 -41°	180/29 -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
MKE Milwaukee, WI	departure	VFR Sky: a broken layer at 25,000 feet	from the south-southwest (210°) at 8 knots	10+ mi	25,000 ft	728 ft	12:52 am CDT (05:52 UTC)
SBN South Bend, IN	100 nm out, 3 nm southeast of the line, tower	IFR Weather: mist	calm	2.5 mi	none	798 ft	06:01 UTC
DAY Dayton, OH	249 nm out, 3 nm west of the line, tower	marginal VFR Sky: overcast at 1,200 feet	from the west-northwest (290°) at 7 knots	10+ mi	1,200 ft	1,009 ft	05:56 UTC
HTS Huntington, WV	369 nm out, 4 nm west of the line, tower	marginal VFR Sky: scattered clouds at 900 feet, overcast at 1,800 feet	calm	10+ mi	1,800 ft	828 ft	05:51 UTC
FAY Fayetteville, NC	638 nm out, 5 nm northeast of the line, tower	VFR	from the southwest (230°) at 10 knots	10+ mi	none	189 ft	05:53 UTC
SJU San Juan, PR	destination	VFR Sky: a few clouds at 2,500 feet, scattered clouds at 3,200 feet, scattered clouds at 4,400 feet	from the east-southeast (110°) at 6 knots	10+ mi	none	9 ft	1:56 am AST (05:56 UTC)

The highest airport on this list sits at 1,009 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At SJU when you get there the forecast at the estimated arrival, 4:00 pm AST (20:00 UTC)

Wind from the east at 13 knots, gusting to 20, visibility more than 6 miles, light rain showers, thunderstorms nearby, scattered clouds at 2,500 feet (thunderheads), a broken layer at 5,000 feet VFR

The whole forecast for SJU

From Mon 2:00 am AST (06:00 UTC): wind from the east-southeast at 6 knots, visibility more than 6 miles, light rain showers, scattered clouds at 2,500 feet, scattered clouds at 5,000 feet
From Mon 10:00 am AST (14:00 UTC): wind from the east at 11 knots, visibility more than 6 miles, showers nearby, a few clouds at 2,500 feet, scattered clouds at 4,000 feet
From Mon 1:00 pm AST (17:00 UTC): wind from the east at 13 knots, gusting to 20, visibility more than 6 miles, light rain showers, thunderstorms nearby, scattered clouds at 2,500 feet (thunderheads), a broken layer at 5,000 feet
From Mon 7:00 pm AST (23:00 UTC): wind from the east-southeast at 6 knots, visibility more than 6 miles, showers nearby, scattered clouds at 3,000 feet, scattered clouds at 6,000 feet

The forecast for MKE, the departure

From Mon 1:00 am CDT (06:00 UTC): wind from the southwest at 8 knots, visibility more than 6 miles, a broken layer at 25,000 feet
From Mon 10:00 am CDT (15:00 UTC): wind from the southwest at 10 knots, gusting to 20, visibility more than 6 miles, scattered clouds at 25,000 feet
From Mon 8:00 pm CDT (01:00 UTC): wind from the southwest at 7 knots, visibility more than 6 miles, low-level wind shear, a few clouds at 4,000 feet, scattered clouds at 11,000 feet
From Tue 4:00 am CDT (09:00 UTC): wind from the west-southwest at 10 knots, visibility more than 6 miles, clear skies

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

6/8713 Maxton, NC, Friday, October 16, 2026 through Sunday, October 18, 2026 UTC 16 nm from the route, 628 nm along the route · air shows/sports · starts Friday 16 October · ZDC
6/8508 Johnsontown, NC 5 nm from the route, 658 nm along the route · security · ZDC
6/4508 CEIBA, PR 24 nm from the route, at the destination end · security · ZSU

Daylight

Sunset at MKE 6:14 pm CDT (23:14 UTC), at SJU 6:03 pm AST (22:03 UTC) (civil twilight ends 6:25 pm AST (22:25 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 upper Mississippi valley · loop National Weather Service

Radar now, the central Great Lakes · loop National Weather Service

Radar now, the Northeast · 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: General Mitchell International, Luis Munoz Marin International.