Plan a flight · Mon 3:02 am EDT (07:02 UTC)

Westchester County to Boeing Fld/King County International HPN → BFI

2,089 nautical miles (2,404 statute miles) northwest on a straight line, true course 297°, about 310° magnetic at the departure end (variation 13W). At 120 knots that is 16 h 59 min at the quickest height in today's winds (4,500 ft, a 3-knot tailwind), arriving about 5:01 pm PDT (00:01 UTC). Right now HPN is marginal VFR, wind from the north (010°) at 8 knots; BFI is VFR, wind from the south-southeast (160°) at 4 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 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 510 nm of the route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the first 200 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 60 to 200 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 690 to 760 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 959 to 1739 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1389 to 1959 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 1619 to 1809 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1689 to 1829 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 190 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 HPN.

Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first

B763 at 800 ft, 26 nm south, 1:51 am EDT (05:51 UTC): a broken layer, remarks: bases at at 80,000 ft and tops 1500. At the departure 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
GA6C descending, 12 nm north, 12:32 am EDT (04:32 UTC): overcast above 1,000 ft, remarks: bases OVC010. At the departure 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
B38M at 34,000 ft, 26 nm north, 12:56 am EDT (04:56 UTC): light chop turbulence. 1209 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

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 17 forecast points nearest it (JFK, AVP, SYR, BUF, TVC, GRB, DLH, AXN, GFK, MOT, DIK, GGW, GTF, GPI, GEG, YKM, SEA). 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	100° at 2 kt	−3 kt	0 °C	123 kt	16 h 59 min	5:01 pm PDT (00:01 UTC)
6,500 ft	light and variable	0	7 °C	120 kt	17 h 24 min	5:26 pm PDT (00:26 UTC)
8,500 ft	240° at 4 kt	+3 kt	5 °C	117 kt	17 h 51 min	5:53 pm PDT (00:53 UTC)
10,500 ft	240° at 8 kt	+5 kt	1 °C	115 kt	18 h 10 min	6:12 pm PDT (01:12 UTC)
12,500 ft	240° at 12 kt	+9 kt	-2 °C	111 kt	18 h 49 min	6:51 pm PDT (01:51 UTC)
14,500 ft	250° at 15 kt	+13 kt	-6 °C	107 kt	19 h 31 min	7:33 pm PDT (02:33 UTC)
16,500 ft	250° at 19 kt	+17 kt	-10 °C	103 kt	20 h 17 min	8:19 pm PDT (03:19 UTC)
18,000 ft FL180	250° at 22 kt	+20 kt	-12 °C	100 kt	20 h 53 min	8:55 pm PDT (03:55 UTC)
24,000 ft FL240	250° at 26 kt	+23 kt	-23 °C	97 kt	21 h 32 min	9:34 pm PDT (04:34 UTC)
30,000 ft FL300	260° at 31 kt	+28 kt	-37 °C	92 kt	22 h 42 min	10:44 pm PDT (05:44 UTC)
34,000 ft FL340	260° at 36 kt	+34 kt	-43 °C	86 kt	24 h 17 min	12:19 am PDT (07:19 UTC)
39,000 ft FL390	260° at 52 kt	+49 kt	-49 °C	71 kt	29 h 25 min	5:27 am PDT (12:27 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
JFK	used from 0 nm out; 42 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°
AVP	used from 50 nm out; 30 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°
SYR	used from 150 nm out; 67 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°
BUF	used from 200 nm out; 26 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°
TVC	used from 400 nm out; 142 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°
GRB	used from 650 nm out; 55 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°
DLH	used from 750 nm out; 99 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°
AXN	used from 949 nm out; 54 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°
GFK	used from 1049 nm out; 55 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°
MOT	used from 1149 nm out; 84 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°
DIK	used from 1249 nm out; 53 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°
GGW	used from 1349 nm out; 85 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°
GTF	used from 1549 nm out; 79 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°
GPI	used from 1699 nm out; 44 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°
GEG	used from 1849 nm out; 26 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°
YKM	used from 1999 nm out; 66 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°
SEA	used from 2049 nm out; 22 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°

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
HPN White Plains, NY	departure	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)
ELM Elmira/Corning, NY	160 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
BUF Buffalo, NY	250 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
GOV Grayling, MI	530 nm out, 4 nm north of the line, tower	VFR	calm	10+ mi	none	1,158 ft	06:55 UTC
PKF Park Falls, WI	780 nm out, 4 nm northwest of the line	no report just now				1,501 ft
AIT Aitkin, MN	919 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
FAR Fargo, ND	1049 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
SDY Sidney, MT	1359 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
GPI Kalispell, MT	1759 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
SFF Spokane, WA	1889 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
BFI Seattle, WA	destination	VFR	from the south-southeast (160°) at 4 knots	10+ mi	none	21 ft	11:53 pm PDT (06:53 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 BFI when you get there the forecast at the estimated arrival, 5:01 pm PDT (00:01 UTC)

Wind from the west at 5 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for BFI

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

The forecast for HPN, the departure

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

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 departure end · security · until 20 October · ZNY

Daylight

Sunset at HPN 6:19 pm EDT (22:19 UTC), at BFI 6:25 pm PDT (01:25 UTC) (civil twilight ends 6:56 pm PDT (01:56 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

Radar now, the Northeast · loop National Weather Service

Radar now, the central Great Lakes · loop National Weather Service

Radar now, the upper Mississippi valley · loop National Weather Service

Radar, the whole country · loop National Weather Service

Surface analysis now Weather Prediction Center

Forecast chart, 12 hours ahead Weather Prediction Center

Forecast chart, 24 hours ahead Weather Prediction Center

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: Westchester County, Boeing Fld/King County International.