Washington Dulles International to St. Louis Downtown Airport IAD → CPS
594 nautical miles (684 statute miles) west on a straight line, true course 272°, about 282° magnetic at the departure end (variation 10W). At 120 knots that is 5 h 15 min at the quickest height in today's winds (12,500 ft, a 7-knot headwind), arriving about 7:00 am CDT (12:00 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: 8 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 E22E: thunderstorms (a convective SIGMET) up to 40,000 ft, moving from the southwest at 20 knots, until 3:55 am EDT (07:55 UTC). Over the first 40 nm of the route.
as issued
WSUS31 KKCI 120555 MKCE WST 120555 CONVECTIVE SIGMET 22E VALID UNTIL 0755Z NY NJ PA DE MD VA DC WV AND MA RI DE NJ NY CSTL WTRS FROM 40E HTO-80SSW ACK-100ESE SIE-30SW CSN-40SSE JST-40E HTO AREA EMBD TS MOV FROM 24020KT. TOPS TO FL400.
- 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 first 466 nm of the route.
- AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the first 69 nm of the route.
- AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 30 to 198 nm out.
- AIRMET TANGO 5W: moderate turbulence below 18,000 ft (due to mountain wave) up to 10,000 ft. Near the route, 119 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 IAD.
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 02:00–09:00 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 6 forecast points nearest it (EKN, CRW, CVG, LOU, EVV, 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 | 320° at 19 kt | +11 kt | 12 °C | 109 kt | 5 h 27 min | 7:12 am CDT (12:12 UTC) |
| 6,500 ft | 330° at 21 kt | +10 kt | 13 °C | 110 kt | 5 h 24 min | 7:09 am CDT (12:09 UTC) |
| 8,500 ft | 330° at 24 kt | +10 kt | 10 °C | 110 kt | 5 h 24 min | 7:09 am CDT (12:09 UTC) |
| 10,500 ft | 340° at 23 kt | +8 kt | 6 °C | 112 kt | 5 h 18 min | 7:03 am CDT (12:03 UTC) |
| 12,500 ft | 340° at 21 kt | +7 kt | 2 °C | 113 kt | 5 h 15 min | 7:00 am CDT (12:00 UTC) |
| 14,500 ft | 330° at 23 kt | +9 kt | -2 °C | 111 kt | 5 h 21 min | 7:06 am CDT (12:06 UTC) |
| 16,500 ft | 330° at 24 kt | +12 kt | -5 °C | 108 kt | 5 h 30 min | 7:15 am CDT (12:15 UTC) |
| 18,000 ft FL180 | 320° at 25 kt | +14 kt | -8 °C | 106 kt | 5 h 36 min | 7:21 am CDT (12:21 UTC) |
| 24,000 ft FL240 | 330° at 33 kt | +17 kt | -20 °C | 103 kt | 5 h 46 min | 7:31 am CDT (12:31 UTC) |
| 30,000 ft FL300 | 330° at 43 kt | +22 kt | -34 °C | 98 kt | 6 h 04 min | 7:49 am CDT (12:49 UTC) |
| 34,000 ft FL340 | 320° at 50 kt | +33 kt | -40 °C | 87 kt | 6 h 50 min | 8:35 am CDT (13:35 UTC) |
| 39,000 ft FL390 | 310° at 40 kt | +29 kt | -49 °C | 91 kt | 6 h 32 min | 8:17 am CDT (13:17 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| EKN | used from 0 nm out; 87 nm from the line | 330/21 12° | 330/25 7° | 350/22 2° | 330/24 -10° | 310/27 -21° | 320/33 -35° | 290/31 -39° | 290/34 -47° | |
| CRW | used from 149 nm out; 41 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° |
| CVG | used from 248 nm out; 64 nm from the line | 320/18 | 350/32 16° | 350/35 10° | 350/30 3° | 330/30 -7° | 340/44 -20° | 340/58 -35° | 330/72 -41° | 320/36 -49° |
| LOU | used from 396 nm out; 52 nm from the line | 310/18 | 340/28 16° | 340/29 10° | 350/27 3° | 330/27 -7° | 340/39 -19° | 330/58 -33° | 330/67 -41° | 330/40 -49° |
| EVV | used from 446 nm out; 43 nm from the line | 280/15 | 290/12 17° | 310/16 10° | 320/13 5° | 310/22 -6° | 320/26 -18° | 320/38 -33° | 310/56 -41° | 320/55 -51° |
| STL | used from 545 nm out; 36 nm from the line | 250/24 | 250/24 16° | 260/23 9° | 270/16 6° | 260/25 -6° | 270/29 -19° | 290/34 -33° | 290/48 -41° | 290/54 -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 |
|---|---|---|---|---|---|---|---|
| IAD Washington, DC | departure | no report just now | 312 ft | ||||
| FRR Front Royal, VA | 40 nm out, 4 nm southeast of the line | no report just now | 703 ft | ||||
| EKN Elkins, WV | 109 nm out, 6 nm southwest of the line | no report just now | 1,987 ft | ||||
| CKB Clarksburg, WV | 129 nm out, 19 nm north of the line, tower | no report just now | 1,223 ft | ||||
| PKB Parkersburg, WV | 188 nm out, 22 nm north of the line, tower | no report just now | 858 ft | ||||
| JRO Jackson, OH | 238 nm out, 2 nm northwest of the line | no report just now | 726 ft | ||||
| CVG Covington, KY | 337 nm out, 9 nm north of the line, tower | no report just now | 896 ft | ||||
| BAK Columbus, IN | 396 nm out, 25 nm north of the line, tower | no report just now | 656 ft | ||||
| BMG Bloomington, IN | 426 nm out, 20 nm north of the line, tower | no report just now | 845 ft | ||||
| FOA Flora, IL | 515 nm out, 2 nm southeast of the line | no report just now | 472 ft | ||||
| SLO Salem, IL | 535 nm out, 4 nm southwest of the line | no report just now | 573 ft | ||||
| CPS Cahokia/St Louis, IL | destination | no report just now | 412 ft |
The highest airport on this list sits at 1,987 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At CPS when you get there the forecast at the estimated arrival, 7:00 am CDT (12:00 UTC)
CPS has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 4/9383 WASHINGTON, DC., USA 8 nm from the route, at the departure end · security · ZDC
- 6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 4 nm from the route, at the departure end · a VIP movement · today · ZDC
- 6/8029 Cincinnati, OH, Friday, October 9, 2026 through Monday, October 12, 2026 Local 4 nm from the route, 337 nm along the route · a VIP movement · until 12 October · ZID
Daylight
Sunset at IAD 6:36 pm EDT (22:36 UTC), at CPS 6:27 pm CDT (23:27 UTC) (civil twilight ends 6:53 pm CDT (23:53 UTC)). At 120 knots the arrival at CPS is before sunrise there (7:06 am CDT (12:06 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: Washington Dulles International, St. Louis Downtown Airport.