General Edward Lawrence Logan International to Luis Munoz Marin International BOS → SJU
1,459 nautical miles (1,679 statute miles) south on a straight line, true course 168°, about 183° magnetic at the departure end (variation 15W). At 120 knots that is 12 h 28 min at the quickest height in today's winds (6,500 ft, a 3-knot headwind), arriving about 4:11 pm AST (20:11 UTC). Right now BOS is IFR, wind from the north (010°) at 10 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: 3,438 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 E25E: thunderstorms (a convective SIGMET) up to 35,000 ft, moving from the southwest at 20 knots, until 4:55 am EDT (08:55 UTC). Over the route from 90 to 150 nm out.
as issued
WSUS31 KKCI 120655 MKCE WST 120655 CONVECTIVE SIGMET 25E VALID UNTIL 0855Z RI NY NJ PA DE MD AND MA RI NJ NY CT CSTL WTRS FROM 30SSE PVD-60SSE ACK-110SSE HTO-40N SBY-30SSW ETX-30SSE PVD AREA EMBD TS MOV FROM 24020KT. TOPS TO FL350.
- AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist), from 2:00 am EDT (06:00 UTC). Over the first 260 nm of the route.
- AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft, from 2:00 am EDT (06:00 UTC). Over the first 60 nm of the route.
- AIRMET TANGO 2W: moderate turbulence below 18,000 ft up to 10,000 ft, from 2:00 am EDT (06:00 UTC). Over the first 80 nm of the route.
- AIRMET TANGO 4W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground), from 2:00 am EDT (06:00 UTC). Over the route from 40 to 110 nm out.
- AIRMET TANGO 6W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots), from 2:00 am EDT (06:00 UTC). Over the route from 190 to 260 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 BOS.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- B763 descending, 39 nm northwest, 2:21 am EDT (06:21 UTC): overcast above 40,000 ft. At the departure end, 39 nm northwest of the line.
as filed, and in English
MHT UA /OV KMHT/TM 0621/FLDURD/TP B763/SK OVC004
- Report
- a routine report filed through MHT
- Where
- over KMHT
- Time
- 06:21 UTC
- Height
- during the descent
- Aircraft
- B763
- Sky
- overcast from 400 ft
- B763 descending, 39 nm northwest, 1:55 am EDT (05:55 UTC): a routine report with nothing remarked on. At the departure end, 39 nm northwest of the line.
as filed, and in English
MHT UA /OV RWY 35/TM 0555/FLDURD/TP B763/SK 004-005 FT
- Report
- a routine report filed through MHT
- Where
- runway 35
- Time
- 05:55 UTC
- Height
- during the descent
- Aircraft
- B763
- Sky
- from 400 ft to 500 ft ft
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 5 forecast points nearest it (BOS, ACK, ORF, ILM, 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 |
|---|---|---|---|---|---|---|
| 4,500 ft | 240° at 16 kt | +4 kt | 116 kt | 12 h 35 min | 4:18 pm AST (20:18 UTC) | |
| 6,500 ft | 250° at 19 kt | +3 kt | 14 °C | 117 kt | 12 h 28 min | 4:11 pm AST (20:11 UTC) |
| 8,500 ft | 250° at 21 kt | +4 kt | 12 °C | 116 kt | 12 h 35 min | 4:18 pm AST (20:18 UTC) |
| 10,500 ft | 250° at 23 kt | +4 kt | 9 °C | 116 kt | 12 h 35 min | 4:18 pm AST (20:18 UTC) |
| 12,500 ft | 250° at 25 kt | +6 kt | 5 °C | 114 kt | 12 h 48 min | 4:31 pm AST (20:31 UTC) |
| 14,500 ft | 240° at 28 kt | +8 kt | 1 °C | 112 kt | 13 h 02 min | 4:45 pm AST (20:45 UTC) |
| 16,500 ft | 240° at 31 kt | +11 kt | -3 °C | 109 kt | 13 h 23 min | 5:06 pm AST (21:06 UTC) |
| 18,000 ft FL180 | 240° at 33 kt | +13 kt | -6 °C | 107 kt | 13 h 38 min | 5:21 pm AST (21:21 UTC) |
| 24,000 ft FL240 | 230° at 40 kt | +18 kt | -17 °C | 102 kt | 14 h 18 min | 6:01 pm AST (22:01 UTC) |
| 30,000 ft FL300 | 230° at 51 kt | +28 kt | -31 °C | 92 kt | 15 h 52 min | 7:35 pm AST (23:35 UTC) |
| 34,000 ft FL340 | 220° at 57 kt | +36 kt | -41 °C | 84 kt | 17 h 22 min | 9:05 pm AST (01:05 UTC) |
| 39,000 ft FL390 | 230° at 59 kt | +32 kt | -52 °C | 88 kt | 16 h 35 min | 8:18 pm AST (00:18 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| BOS | used from 0 nm out; 25 nm from the line | 110/20 | 200/26 12° | 280/24 8° | 260/29 3° | 250/47 -10° | 230/59 -19° | 230/74 -33° | 240/95 -41° | 240/96 -53° |
| ACK | used from 50 nm out; 29 nm from the line | 230/29 | 270/37 16° | 270/38 10° | 270/40 4° | 240/46 -8° | 230/52 -17° | 240/74 -31° | 240/83 -41° | 240/91 -53° |
| ORF | used from 400 nm out; 347 nm from the line | 250/24 | 230/32 11° | 220/37 10° | 220/37 6° | 230/47 -5° | 230/62 -17° | 220/89 -30° | 220/93 -40° | 230/77 -51° |
| ILM | used from 650 nm out; 512 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° |
| MIA | used from 949 nm out; 695 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 |
|---|---|---|---|---|---|---|---|
| BOS Boston, MA | departure | IFR Sky: a broken layer at 500 feet, overcast at 1,300 feet Weather: light rain, mist | from the north (010°) at 10 knots | 5 mi | 500 ft | 19 ft | 2:54 am EDT (06:54 UTC) |
| MVY Vineyard Haven, MA | 60 nm out, 6 nm east of the line, tower | IFR Sky: overcast at 500 feet | from the north (010°) at 14 knots, gusting to 23 | 10+ mi | 500 ft | 66 ft | 07:09 UTC |
| SJU San Juan, PR | destination | VFR Sky: a few clouds at 1,600 feet, scattered clouds at 2,300 feet, a broken layer at 4,500 feet Weather: light rain | from the east-southeast (110°) at 6 knots | 10+ mi | 4,500 ft | 9 ft | 2:56 am AST (06:56 UTC) |
The highest airport on this list sits at 66 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, 4:11 pm AST (20:11 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 3:00 am AST (07:00 UTC): wind from the east-southeast at 6 knots, visibility more than 6 miles, light rain showers, thunderstorms nearby, scattered clouds at 2,500 feet (thunderheads), 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 BOS, the departure
- From Mon 2:00 am EDT (06:00 UTC): wind from the northeast at 12 knots, visibility 3 miles, light rain showers, mist, overcast at 300 feet
- From Mon 7:00 am EDT (11:00 UTC): wind from the north-northeast at 11 knots, visibility 5 miles, mist, a broken layer at 800 feet
- From Mon 11:00 am EDT (15:00 UTC): wind from the north at 8 knots, visibility more than 6 miles, scattered clouds at 15,000 feet
- From Mon 3:00 pm EDT (19:00 UTC): wind from the northwest at 7 knots, visibility more than 6 miles, scattered clouds at 15,000 feet
- From Mon 11:00 pm EDT (03:00 UTC): wind from the northeast at 10 knots, visibility more than 6 miles, scattered clouds at 4,500 feet
Temporary flight restrictions on the line or within 25 nm of it
- 6/8802 Foxborough, MA, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 14 nm from the route, at the departure end · drones kept away from a public gathering · starts Saturday 17 October · ZBW
- 6/4508 CEIBA, PR 24 nm from the route, at the destination end · security · ZSU
Daylight
Sunset at BOS 6:07 pm EDT (22:07 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
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 Edward Lawrence Logan International, Luis Munoz Marin International.