Boeing Fld/King County International to Westchester County BFI → HPN
2,089 nautical miles (2,404 statute miles) east on a straight line, true course 082°, about 067° magnetic at the departure end (variation 15E). At 120 knots that is 12 h 22 min at the quickest height in today's winds (39,000 ft, a 49-knot tailwind), arriving about 3:24 pm EDT (19:24 UTC). Right now BFI is VFR, wind from the south-southeast (160°) at 4 knots; HPN is marginal VFR, wind from the north (010°) at 8 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 TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 190 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 130 to 700 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 260 to 400 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 280 to 470 nm out.
- AIRMET SIERRA 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 350 to 1129 nm out.
- AIRMET TANGO 3W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Over the route from 1329 to 1399 nm out.
- 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 last 510 nm of the route.
- AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the last 200 nm of the route.
- AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1889 to 2029 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 BFI.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- B38M at 34,000 ft, 26 nm north, 9:56 pm PDT (04:56 UTC): light chop turbulence. 879 nm along the route, 26 nm north of the line.
as filed, and in English
MOT UA /OV MOT115040/TM 0456/FL340/TP B38M/TB LGT CHOP
- Report
- a routine report filed through MOT
- Where
- 40 nm southeast (115°) of MOT
- Time
- 04:56 UTC
- Height
- at 34,000 ft
- Aircraft
- B38M
- Turbulence
- light chop
- GA6C descending, 12 nm north, 9:32 pm PDT (04:32 UTC): overcast above 1,000 ft, remarks: bases OVC010. At the destination end, 12 nm north of the line.
as filed, and in English
SWF UA /OV SWF 270005/TM 0432/FLDURD/TP GA6C/SK OVC010/RM BASES OVC010
- Report
- a routine report filed through SWF
- Where
- 5 nm west (270°) of SWF
- Time
- 04:32 UTC
- Height
- during the descent
- Aircraft
- GA6C
- Sky
- overcast from 1,000 ft
- Remarks
- bases OVC010
- B763 at 800 ft, 26 nm south, 10:51 pm PDT (05:51 UTC): a broken layer, remarks: bases at at 80,000 ft and tops 1500. At the destination end, 26 nm south of the line.
as filed, and in English
JFK UA /OV JFK 2 MILES SOUTHEAST/TM 0551/FL008/TP B763/SK BKN/RM BASES AT 800 AND TOPS 1500
- Report
- a routine report filed through JFK
- Where
- jfk 2 miles southeast
- Time
- 05:51 UTC
- Height
- at 800 ft
- Aircraft
- B763
- Sky
- a broken layer
- Remarks
- bases at at 80,000 ft and tops 1500
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 17 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, GGW, DIK, MOT, GFK, AXN, DLH, GRB, TVC, BUF, SYR, AVP, JFK). 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 4 kt | −4 kt | 124 kt | 16 h 51 min | 7:53 pm EDT (23:53 UTC) | |
| 5,500 ft | 070° at 1 kt | +1 kt | 1 °C | 119 kt | 17 h 33 min | 8:35 pm EDT (00:35 UTC) |
| 7,500 ft | 250° at 2 kt | −2 kt | 6 °C | 122 kt | 17 h 07 min | 8:09 pm EDT (00:09 UTC) |
| 9,500 ft | 240° at 6 kt | −5 kt | 3 °C | 125 kt | 16 h 43 min | 7:45 pm EDT (23:45 UTC) |
| 11,500 ft | 240° at 10 kt | −7 kt | 0 °C | 127 kt | 16 h 27 min | 7:29 pm EDT (23:29 UTC) |
| 13,500 ft | 240° at 14 kt | −11 kt | -4 °C | 131 kt | 15 h 57 min | 6:59 pm EDT (22:59 UTC) |
| 15,500 ft | 250° at 17 kt | −15 kt | -8 °C | 135 kt | 15 h 28 min | 6:30 pm EDT (22:30 UTC) |
| 17,500 ft | 250° at 21 kt | −19 kt | -11 °C | 139 kt | 15 h 02 min | 6:04 pm EDT (22:04 UTC) |
| 18,000 ft FL180 | 260° at 22 kt | −20 kt | -12 °C | 140 kt | 14 h 55 min | 5:57 pm EDT (21:57 UTC) |
| 24,000 ft FL240 | 250° at 26 kt | −23 kt | -23 °C | 143 kt | 14 h 37 min | 5:39 pm EDT (21:39 UTC) |
| 30,000 ft FL300 | 260° at 31 kt | −29 kt | -37 °C | 149 kt | 14 h 01 min | 5:03 pm EDT (21:03 UTC) |
| 34,000 ft FL340 | 260° at 36 kt | −34 kt | -43 °C | 154 kt | 13 h 34 min | 4:36 pm EDT (20:36 UTC) |
| 39,000 ft FL390 | 260° at 51 kt | −49 kt | -49 °C | 169 kt | 12 h 22 min | 3:24 pm EDT (19:24 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SEA | used from 0 nm out; 26 nm from the line | 050/7 | 050/11 1° | 050/12 -5° | 030/31 -7° | 010/61 -15° | 010/69 -26° | 360/73 -40° | 360/62 -47° | 330/21 -43° |
| YKM | used from 50 nm out; 67 nm from the line | 070/10 | 040/15 -1° | 020/27 -8° | 030/25 -13° | 020/48 -20° | 010/83 -27° | 010/77 -37° | 010/49 -40° | 350/14 -41° |
| GEG | used from 100 nm out; 69 nm from the line | 080/16 -2° | 050/17 -7° | 080/9 -10° | 190/33 -21° | 180/31 -32° | L/V -35° | L/V -37° | 270/8 -40° | |
| GPI | used from 250 nm out; 55 nm from the line | 070/19 -5° | 100/16 -7° | 080/10 -8° | 130/8 -19° | 170/37 -28° | 200/50 -40° | 210/43 -40° | 220/41 -42° | |
| GTF | used from 400 nm out; 35 nm from the line | 070/11 | 080/15 -7° | 110/19 -9° | 190/25 -14° | 200/34 -23° | 200/54 -39° | 220/66 -40° | 220/77 -44° | |
| GGW | used from 550 nm out; 61 nm from the line | 110/23 0° | 130/20 -2° | 170/24 -3° | 230/44 -11° | 220/51 -21° | 210/52 -39° | 220/64 -44° | 240/85 -48° | |
| DIK | used from 700 nm out; 85 nm from the line | 150/24 7° | 200/38 6° | 220/53 0° | 230/51 -9° | 230/49 -21° | 240/37 -37° | 240/47 -44° | 250/65 -48° | |
| MOT | used from 799 nm out; 50 nm from the line | 120/14 5° | 200/20 4° | 230/33 1° | 250/39 -11° | 250/50 -21° | 240/61 -37° | 250/56 -45° | 260/68 -51° | |
| GFK | used from 949 nm out; 65 nm from the line | 070/18 | 100/10 9° | 250/11 6° | 250/27 1° | 250/34 -10° | 260/43 -21° | 260/39 -36° | 260/36 -46° | 260/59 -53° |
| AXN | used from 1049 nm out; 62 nm from the line | 100/14 | 250/21 14° | 240/24 12° | 240/31 5° | 260/36 -10° | 260/40 -21° | 250/42 -36° | 260/48 -45° | 260/53 -50° |
| DLH | used from 1149 nm out; 58 nm from the line | 080/28 | 240/21 15° | 250/26 9° | 250/32 3° | 260/42 -11° | 270/40 -21° | 260/43 -36° | 260/46 -46° | 260/65 -54° |
| GRB | used from 1349 nm out; 74 nm from the line | 250/36 | 270/23 16° | 270/14 9° | 240/18 4° | 280/26 -9° | 280/29 -20° | 290/42 -36° | 290/51 -45° | 290/72 -55° |
| TVC | used from 1449 nm out; 49 nm from the line | 260/31 | 280/22 15° | 290/18 10° | 270/13 2° | 290/25 -10° | 300/35 -21° | 310/52 -37° | 320/59 -47° | 300/84 -54° |
| BUF | used from 1699 nm out; 114 nm from the line | 320/10 | 010/16 10° | 360/10 6° | 340/13 2° | 330/22 -11° | 300/25 -23° | 320/31 -38° | 300/29 -44° | 280/36 -50° |
| SYR | used from 1899 nm out; 64 nm from the line | 280/13 | 350/18 10° | 340/10 6° | 300/15 1° | 280/17 -12° | 270/16 -23° | 280/25 -38° | 250/40 -42° | 240/53 -50° |
| AVP | used from 1949 nm out; 37 nm from the line | 150/5 | 350/13 12° | 270/20 8° | 260/17 4° | 260/25 -11° | 240/31 -22° | 240/54 -35° | 230/61 -41° | 240/55 -49° |
| JFK | used from 2049 nm out; 38 nm from the line | 250/18 | 250/23 14° | 240/33 9° | 240/33 4° | 240/38 -10° | 240/45 -21° | 230/86 -32° | 230/102 -40° | 230/84 -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 |
|---|---|---|---|---|---|---|---|
| BFI Seattle, WA | departure | VFR | from the south-southeast (160°) at 4 knots | 10+ mi | none | 21 ft | 11:53 pm PDT (06:53 UTC) |
| SFF Spokane, WA | 200 nm out, 11 nm south of the line, tower | VFR Sky: a few clouds at 9,000 feet, a broken layer at 11,000 feet | calm | 10+ mi | 11,000 ft | 1,956 ft | 06:53 UTC |
| GPI Kalispell, MT | 330 nm out, 21 nm north of the line, tower | VFR Sky: overcast at 6,500 feet | from the north (360°) at 12 knots | 10+ mi | 6,500 ft | 2,976 ft | 06:55 UTC |
| SDY Sidney, MT | 730 nm out, 2 nm southeast of the line | IFR Sky: a broken layer at 600 feet, overcast at 1,300 feet Weather: rain | from the northeast (050°) at 13 knots | 7 mi | 600 ft | 1,985 ft | 06:56 UTC |
| FAR Fargo, ND | 1039 nm out, 5 nm southwest of the line, tower | low IFR Sky: overcast at 400 feet Weather: mist | from the north (360°) at 15 knots | 2 mi | 400 ft | 901 ft | 06:53 UTC |
| AIT Aitkin, MN | 1169 nm out, 4 nm northwest of the line | VFR Sky: scattered clouds at 12,000 feet | from the northeast (040°) at 6 knots | 10+ mi | none | 1,206 ft | 06:55 UTC |
| PKF Park Falls, WI | 1309 nm out, 4 nm northwest of the line | no report just now | 1,501 ft | ||||
| GOV Grayling, MI | 1559 nm out, 4 nm north of the line, tower | VFR | calm | 10+ mi | none | 1,158 ft | 06:55 UTC |
| BUF Buffalo, NY | 1839 nm out, 4 nm north of the line, tower | VFR Sky: scattered clouds at 3,400 feet, a broken layer at 14,000 feet | from the south (170°) at 4 knots | 10+ mi | 14,000 ft | 726 ft | 06:54 UTC |
| ELM Elmira/Corning, NY | 1929 nm out, 5 nm south of the line, tower | low IFR Sky: a few clouds at 100 feet, a broken layer at 1,000 feet, overcast at 2,700 feet Weather: fog | calm | 0.5 mi | 1,000 ft | 955 ft | 06:53 UTC |
| HPN White Plains, NY | destination | marginal VFR Sky: overcast at 1,500 feet | from the north (010°) at 8 knots | 10+ mi | 1,500 ft | 439 ft | 2:56 am EDT (06:56 UTC) |
The highest airport on this list sits at 2,976 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At HPN when you get there the forecast at the estimated arrival, 3:24 pm EDT (19:24 UTC)
Wind from the north-northwest at 9 knots, visibility more than 6 miles, a few clouds at 2,500 feet, scattered clouds at 5,000 feet VFR
The whole forecast for HPN
- From Mon 2:00 am EDT (06:00 UTC): wind from the north at 10 knots, visibility 6 miles, mist, showers nearby, overcast at 600 feet
- From Mon 7:00 am EDT (11:00 UTC): wind from the north at 9 knots, visibility more than 6 miles, overcast at 800 feet
- From Mon 10:00 am EDT (14:00 UTC): wind from the north-northwest at 9 knots, visibility more than 6 miles, a broken layer at 2,000 feet
- From Mon 1:00 pm EDT (17:00 UTC): wind from the north-northwest at 9 knots, visibility more than 6 miles, a few clouds at 2,500 feet, scattered clouds at 5,000 feet
- From Mon 10:00 pm EDT (02:00 UTC): wind light and variable, visibility more than 6 miles, a few clouds at 5,000 feet, a few clouds at 15,000 feet
The forecast for BFI, the departure
- From Sun 11:00 pm PDT (06:00 UTC): wind calm, visibility more than 6 miles, clear skies
- From Mon 3:00 am PDT (10:00 UTC): wind calm, visibility more than 6 miles, patches of fog, clear skies
- From Mon 9:00 am PDT (16:00 UTC): wind from the south-southeast at 3 knots, visibility more than 6 miles, clear skies
- From Mon 12:00 pm PDT (19:00 UTC): wind from the west-southwest at 3 knots, visibility more than 6 miles, clear skies
- From Mon 2:00 pm PDT (21:00 UTC): wind from the west at 5 knots, visibility more than 6 miles, clear skies
- From Mon 7:00 pm PDT (02:00 UTC): wind calm, visibility more than 6 miles, clear skies
Temporary flight restrictions on the line or within 25 nm of it
- 5/2811 NEW YORK, NY, Monday, October 20, 2025 through Tuesday, October 20, 2026 Local 21 nm from the route, at the destination end · security · until 20 October · ZNY
Daylight
Sunset at BFI 6:25 pm PDT (01:25 UTC), at HPN 6:19 pm EDT (22:19 UTC) (civil twilight ends 6:46 pm EDT (22:46 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: Boeing Fld/King County International, Westchester County.