Key West International to The Florida Keys Marathon International EYW → MTH
40 nautical miles (46 statute miles) east on a straight line, true course 075°, about 079° magnetic at the departure end (variation 4W). At 120 knots that is 20 min at the quickest height in today's winds (5,500 ft, a 1-knot headwind), arriving about 4:57 am EDT (08:57 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 4E: thunderstorms (a convective SIGMET) up to 43,000 ft, moving from the east at 10 knots, until 5:55 am EDT (09:55 UTC). Over the first 30 nm of the route.
as issued
WSUS31 KKCI 130755 MKCE WST 130755 CONVECTIVE SIGMET 4E VALID UNTIL 0955Z FL AND CSTL WTRS FROM 40NNE EYW-40E EYW-20SSW EYW-30WNW EYW-40NNE EYW AREA TS MOV FROM 07010KT. TOPS TO FL430.
Turbulence No turbulence warning in force along the route. No pilot has reported turbulence near the line in the last three hours. The government's turbulence forecast map ↗
Icing No icing warning in force along the route. No pilot has reported icing near the line in the last three hours. The freezing level is about 15,000 ft (from the winds-aloft temperatures), so icing is possible in cloud above that. The government's icing forecast map ↗
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 EYW.
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 08:00–15:00 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 1 forecast point nearest it (EYW). 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 | 070° at 7 kt | +7 kt | 113 kt | 21 min | 4:58 am EDT (08:58 UTC) | |
| 5,500 ft | 070° at 1 kt | +1 kt | 119 kt | 20 min | 4:57 am EDT (08:57 UTC) | |
| 7,500 ft | light and variable | 0 | 14 °C | 120 kt | 20 min | 4:57 am EDT (08:57 UTC) |
| 9,500 ft | 060° at 1 kt | +1 kt | 12 °C | 119 kt | 20 min | 4:57 am EDT (08:57 UTC) |
| 11,500 ft | 060° at 7 kt | +6 kt | 8 °C | 114 kt | 21 min | 4:58 am EDT (08:58 UTC) |
| 13,500 ft | 040° at 8 kt | +7 kt | 4 °C | 113 kt | 21 min | 4:58 am EDT (08:58 UTC) |
| 15,500 ft | 020° at 9 kt | +5 kt | -1 °C | 115 kt | 21 min | 4:58 am EDT (08:58 UTC) |
| 17,500 ft | 360° at 10 kt | +3 kt | -5 °C | 117 kt | 21 min | 4:58 am EDT (08:58 UTC) |
| 18,000 ft FL180 | 360° at 11 kt | +3 kt | -6 °C | 117 kt | 21 min | 4:58 am EDT (08:58 UTC) |
| 24,000 ft FL240 | 030° at 23 kt | +16 kt | -17 °C | 104 kt | 23 min | 5:00 am EDT (09:00 UTC) |
| 30,000 ft FL300 | 010° at 21 kt | +9 kt | -33 °C | 111 kt | 22 min | 4:59 am EDT (08:59 UTC) |
| 34,000 ft FL340 | 030° at 15 kt | +11 kt | -41 °C | 109 kt | 22 min | 4:59 am EDT (08:59 UTC) |
| 39,000 ft FL390 | 010° at 22 kt | +9 kt | -51 °C | 111 kt | 22 min | 4:59 am EDT (08:59 UTC) |
Based on data from the 13th at 06:00 UTC; valid on the 13th 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| EYW | used from 0 nm out; 20 nm from the line | 070/9 | L/V 16° | L/V 13° | 060/8 7° | 360/11 -6° | 030/23 -17° | 010/21 -33° | 030/15 -41° | 010/22 -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 |
|---|---|---|---|---|---|---|---|
| EYW Key West, FL | departure | no report just now | 3 ft | ||||
| MTH Marathon, FL | destination | no report just now | 7 ft |
The highest airport on this list sits at 7 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
The codes as issued, and in English, for every airport in the table
At MTH when you get there the forecast at the estimated arrival, 4:57 am EDT (08:57 UTC)
MTH has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/5945 Key West, FL 7 nm from the route, at the departure end · security · ZMA
- 6/0299 Key West, FL, Friday, June 26, 2026 through Saturday, October 17, 2026 Local 7 nm from the route, at the departure end · security · until 17 October · ZMA
Notices to air missions closures and things out of service at both ends; airspace, navigation aids and obstructions near the line
EYW: 9 notices in force, 1 starting within a week. all of them, grouped →
MTH: 1 notice in force. all of them, grouped →
No airspace, navigation-aid or obstruction notice near the line.
From the FAA's notice service (NOTAMs), the site's copy refreshed every few minutes; last checked a minute ago. The FAA has so far issued eFlight its test feed, which misses some notices (checked against the FAA's own search on 12 October: about a third missing at Santa Barbara and Burbank, none at Atlanta or Las Vegas); the request for the full feed is with the FAA. Times are local to the field. This is for planning; the legal briefing comes from Flight Service or the FAA's own tools.
Daylight
Sunset at EYW 7:02 pm EDT (23:02 UTC), at MTH 6:59 pm EDT (22:59 UTC) (civil twilight ends 7:22 pm EDT (23:22 UTC)). At 120 knots the arrival at MTH is before sunrise there (7:21 am EDT (11:21 UTC)).
Each restriction opens the FAA's own page with the exact area, heights and times.
The wind over the route live wind map, from Windy.com · drag the time bar for the coming hours; the level menu changes the height
Colours show wind speed, the moving lines its direction, at the surface unless you pick a height. Map and forecast by Windy.com; a second opinion beside the government's winds-aloft table above.
Radar and forecast charts for the regions crossed government pictures, the latest each time the page loads · the turbulence and icing forecasts: turbulence ↗ · icing ↗
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: Key West International, The Florida Keys Marathon International.