Cyril E King Airport to Portland International Jetport STT → PWM
1,543 nautical miles (1,776 statute miles) north on a straight line, true course 351°, about 004° magnetic at the departure end (variation 13W). At 120 knots that is 11 h 41 min at the quickest height in today's winds (34,000 ft, a 12-knot tailwind), arriving about 5:42 pm EDT (21:42 UTC). Right now STT is VFR, wind from the east (090°) at 6 knots; PWM is VFR, wind calm. 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
- AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist, fog). Over the last 319 nm of the route.
- AIRMET TANGO 6W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 1225 to 1255 nm out.
- AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 24,000 ft to 33,000 ft. Over the last 229 nm of the route.
- AIRMET ZULU 1C: moderate icing from 12,000 ft to 24,000 ft. Over the last 10 nm of 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 STT.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- A321 at 9,500 ft, 48 nm west, 5:05 am AST (09:05 UTC): moderate turbulence, remarks: moderate turbulence during the descent jfund arrival from from 9,500 ft to 7,000 ft, smooth below. At the destination end, 48 nm west of the line.
as filed, and in English
BOS UA /OV BOS350010/TM 0905/FL095/TP A321/TB MOD/RM MOD TB DURD JFUND ARR FROM 095-070, SMOOTH BELOW
- Report
- a routine report filed through BOS
- Where
- 10 nm north (350°) of BOS
- Time
- 09:05 UTC
- Height
- at 9,500 ft
- Aircraft
- A321
- Turbulence
- moderate
- Remarks
- moderate turbulence during the descent jfund arrival from from 9,500 ft to 7,000 ft, smooth below
- B38M at 10,000 ft, 43 nm west, 5:42 am AST (09:42 UTC): light turbulence, remarks: light turbulence during the climb from 8,000 ft to 10,000 ft. At the destination end, 43 nm west of the line.
as filed, and in English
BOS UA /OV BOS020010/TM 0942/FL100/TP B38M/TB LGT/RM LGT TB DURC 080-100
- Report
- a routine report filed through BOS
- Where
- 10 nm north (020°) of BOS
- Time
- 09:42 UTC
- Height
- at 10,000 ft
- Aircraft
- B38M
- Turbulence
- light
- Remarks
- light turbulence during the climb from 8,000 ft to 10,000 ft
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 6 forecast points nearest it (MIA, ILM, ORF, ACK, BOS, PWM). 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 | 310° at 12 kt | +10 kt | 110 kt | 14 h 02 min | 8:03 pm EDT (00:03 UTC) | |
| 5,500 ft | 290° at 16 kt | +8 kt | 112 kt | 13 h 47 min | 7:48 pm EDT (23:48 UTC) | |
| 7,500 ft | 280° at 18 kt | +7 kt | 12 °C | 113 kt | 13 h 39 min | 7:40 pm EDT (23:40 UTC) |
| 9,500 ft | 280° at 18 kt | +6 kt | 9 °C | 114 kt | 13 h 32 min | 7:33 pm EDT (23:33 UTC) |
| 11,500 ft | 280° at 18 kt | +6 kt | 6 °C | 114 kt | 13 h 32 min | 7:33 pm EDT (23:33 UTC) |
| 13,500 ft | 280° at 20 kt | +6 kt | 2 °C | 114 kt | 13 h 32 min | 7:33 pm EDT (23:33 UTC) |
| 15,500 ft | 270° at 23 kt | +5 kt | -2 °C | 115 kt | 13 h 25 min | 7:26 pm EDT (23:26 UTC) |
| 17,500 ft | 270° at 26 kt | +4 kt | -7 °C | 116 kt | 13 h 18 min | 7:19 pm EDT (23:19 UTC) |
| 18,000 ft FL180 | 270° at 27 kt | +3 kt | -8 °C | 117 kt | 13 h 11 min | 7:12 pm EDT (23:12 UTC) |
| 24,000 ft FL240 | 260° at 32 kt | −1 kt | -19 °C | 121 kt | 12 h 45 min | 6:46 pm EDT (22:46 UTC) |
| 30,000 ft FL300 | 250° at 51 kt | −10 kt | -33 °C | 130 kt | 11 h 52 min | 5:53 pm EDT (21:53 UTC) |
| 34,000 ft FL340 | 250° at 60 kt | −12 kt | -41 °C | 132 kt | 11 h 41 min | 5:42 pm EDT (21:42 UTC) |
| 39,000 ft FL390 | 250° at 51 kt | −8 kt | -51 °C | 128 kt | 12 h 03 min | 6:04 pm EDT (22:04 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| MIA | used from 0 nm out; 946 nm from the line | L/V | L/V 17° | L/V 13° | L/V 8° | 270/6 -6° | 250/9 -17° | 290/17 -32° | 280/25 -41° | 280/21 -52° |
| ILM | used from 498 nm out; 736 nm from the line | 300/18 | 300/22 13° | 300/21 8° | 290/28 4° | 280/38 -7° | 270/40 -18° | 250/49 -32° | 250/50 -40° | 270/33 -50° |
| ORF | used from 747 nm out; 567 nm from the line | 310/30 | 320/27 11° | 310/30 8° | 320/30 3° | 290/36 -8° | 270/40 -21° | 250/52 -32° | 250/50 -39° | 260/42 -48° |
| ACK | used from 946 nm out; 430 nm from the line | 340/16 | 270/32 14° | 260/37 9° | 260/30 4° | 250/41 -9° | 250/49 -21° | 240/92 -34° | 240/107 -42° | 240/94 -52° |
| BOS | used from 1444 nm out; 46 nm from the line | 020/10 | 360/20 10° | 340/19 7° | 290/21 2° | 270/35 -9° | 260/42 -22° | 250/55 -38° | 240/75 -43° | 250/72 -51° |
| PWM | used from 1494 nm out; 25 nm from the line | 320/11 | 260/11 8° | 310/14 5° | 310/19 1° | 300/26 -11° | 290/31 -22° | 270/48 -40° | 250/60 -43° | 250/69 -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 | Wind | Visibility | Ceiling | Elevation | Reported |
|---|---|---|---|---|---|---|---|
| STT Charlotte Amalie, VI | departure | VFR | from the east (090°) at 6 knots | 10+ mi | none | 23 ft | 4:53 am AST (08:53 UTC) |
| ACK Nantucket, MA | 1404 nm out, 19 nm west of the line, tower | low IFR Sky: overcast at 400 feet | from the north-northeast (030°) at 18 knots, gusting to 24 | 8 mi | 400 ft | 46 ft | 09:53 UTC |
| PWM Portland, ME | destination | VFR Sky: a few clouds at 3,500 feet, a broken layer at 8,500 feet, overcast at 10,000 feet | calm | 10+ mi | 8,500 ft | 75 ft | 5:51 am EDT (09:51 UTC) |
The highest airport on this list sits at 75 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At PWM when you get there the forecast at the estimated arrival, 5:42 pm EDT (21:42 UTC)
Wind from the west-northwest at 7 knots, visibility more than 6 miles, a few clouds at 25,000 feet VFR
The whole forecast for PWM
- From Mon 5:00 am EDT (09:00 UTC): wind from the north at 3 knots, visibility more than 6 miles, a few clouds at 300 feet, a broken layer at 3,500 feet and more above
- From Mon 7:00 am EDT (11:00 UTC): wind from the west-northwest at 3 knots, visibility 6 miles, mist, overcast at 1,500 feet
- From Mon 10:30 am EDT (14:30 UTC): wind from the west-northwest at 7 knots, visibility more than 6 miles, a few clouds at 25,000 feet
- From Mon 10:00 pm EDT (02:00 UTC): wind from the north-northeast at 12 knots, gusting to 22, visibility 6 miles, mist, a broken layer at 2,500 feet
The forecast for STT, the departure
- From Mon 2:00 am AST (06:00 UTC): wind from the east at 6 knots, visibility more than 6 miles, showers nearby, scattered clouds at 2,500 feet, a broken layer at 5,000 feet
- From Mon 9:00 am AST (13:00 UTC): wind from the east-southeast at 10 knots, visibility more than 6 miles, showers nearby, scattered clouds at 3,500 feet
- From Mon 7:00 pm AST (23:00 UTC): wind from the east at 7 knots, visibility more than 6 miles, showers nearby, scattered clouds at 2,500 feet, scattered clouds at 5,000 feet
Temporary flight restrictions on the line or within 25 nm of it
- 6/2698 VIEQUES, PR, Monday, January 19, 2026 through Friday, December 18, 2026 UTC 20 nm from the route, at the departure end · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 18 December · ZSU
Daylight
Sunset at STT 5:59 pm AST (21:59 UTC), at PWM 6:03 pm EDT (22:03 UTC) (civil twilight ends 6:32 pm EDT (22:32 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: Cyril E King Airport, Portland International Jetport.