Plan a flight · Sun 8:02 pm CDT (01:02 UTC)

Grand Forks International to Boeing Fld/King County International GFK → BFI

1,010 nautical miles (1,163 statute miles) west on a straight line, true course 278°, about 272° magnetic at the departure end (variation 6E). At 120 knots that is 7 h 36 min at the quickest height in today's winds (4,500 ft, a 13-knot tailwind), arriving about 1:38 am PDT (08:38 UTC), after sunset at the destination. Right now GFK is IFR, wind from the north (360°) at 15 knots, gusting to 20; BFI is VFR, wind from the northwest (310°) 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: 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 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the first 59 nm of the route.
AIRMET ZULU 4C: moderate icing up to 20,000 ft. Over the first 277 nm of the route.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 248 to 733 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 446 to 654 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 505 to 783 nm out.
AIRMET ZULU 2C: moderate icing up to 14,000 ft. Over the route from 644 to 882 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 25,000 ft to 39,000 ft. Over the last 0 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 GFK.

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

CRJ7 at 1,500 ft, 2 nm east, 7:01 pm CDT (00:01 UTC): overcast above 1,500 ft. At the departure end, 2 nm east of the line.
as filed, and in English
```
GFK UA /OV GFK090002/TM 0001/FL015/TP CRJ7/SK OVC015
```
Report
a routine report filed through GFK
Where
2 nm east (090°) of GFK
Time
00:01 UTC
Height
at 1,500 ft
Aircraft
CRJ7
Sky
overcast from 1,500 ft
PC12 at 1,500 ft, 1 nm north, 6:45 pm CDT (23:45 UTC): overcast above 1,500 ft, 6 °C. At the departure end, 1 nm north of the line.
as filed, and in English
```
GFK UA /OV GFK350001/TM 2345/FL015/TP PC12/SK OVC015/TA 06
```
Report
a routine report filed through GFK
Where
1 nm north (350°) of GFK
Time
23:45 UTC
Height
at 1,500 ft
Aircraft
PC12
Sky
overcast from 1,500 ft
Temperature
6 °C
B789 at 37,000 ft, 38 nm north, 6:10 pm CDT (23:10 UTC): light chop turbulence. At the departure end, 38 nm north of the line.
as filed, and in English
```
GFK UA /OV GFK340040/TM 2310/FL370/TP B789/TB LGT CHOP
```
Report
a routine report filed through GFK
Where
40 nm north (340°) of GFK
Time
23:10 UTC
Height
at 37,000 ft
Aircraft
B789
Turbulence
light chop
PC12 at 16,000 ft, 44 nm south, 7:12 pm CDT (00:12 UTC): light icing, -6 °C. 69 nm along the route, 44 nm south of the line.
as filed, and in English
```
JMS UA /OV JMS332028/TM 0012/FL160/TP PC12/TA M06/IC LGT CLR
```
Report
a routine report filed through JMS
Where
28 nm northwest (332°) of JMS
Time
00:12 UTC
Height
at 16,000 ft
Aircraft
PC12
Temperature
−6 °C
Icing
light clear
PA24 at 6,000 ft, 9 nm south, 7:08 pm CDT (00:08 UTC): no icing. 129 nm along the route, 9 nm south of the line.
as filed, and in English
```
MOT UA /OV MOT094042/TM 0008/FL060/TP PA24/IC NEG
```
Report
a routine report filed through MOT
Where
42 nm east (094°) of MOT
Time
00:08 UTC
Height
at 6,000 ft
Aircraft
PA24
Icing
none
B38M at 32,000 ft, 37 nm south, 6:12 pm CDT (23:12 UTC): light chop turbulence. 218 nm along the route, 37 nm south of the line.
as filed, and in English
```
MOT UA /OV MOT225061/TM 2312/FL320/TP B38M/TB CONS LGT CHOP
```
Report
a routine report filed through MOT
Where
61 nm southwest (225°) of MOT
Time
23:12 UTC
Height
at 32,000 ft
Aircraft
B38M
Turbulence
continuous light chop
PA24 at 6,000 ft, 10 nm north, 7:48 pm CDT (00:48 UTC): light rime icing from 5,000 ft to 6,000 ft, 2 °C. 228 nm along the route, 10 nm north of the line.
as filed, and in English
```
XWA UA /OV XWA060040/TM 0048/FL060/TP PA24/TA 02/IC LGT RIME 060-050
```
Report
a routine report filed through XWA
Where
40 nm northeast (060°) of XWA
Time
00:48 UTC
Height
at 6,000 ft
Aircraft
PA24
Temperature
2 °C
Icing
light rime from 6,000 ft to 5,000 ft
PC12 at 13,000 ft, 45 nm south, 7:42 pm CDT (00:42 UTC): remarks: zse. At the destination end, 45 nm south of the line.
as filed, and in English
```
YKM UA /OV YKM270050/TM 0042/FL130/TP PC12/SK TOP130/RM -ZSE
```
Report
a routine report filed through YKM
Where
50 nm west (270°) of YKM
Time
00:42 UTC
Height
at 13,000 ft
Aircraft
PC12
Sky
TOP130
Remarks
zse
PC12 at 15,000 ft, 45 nm south, 7:42 pm CDT (00:42 UTC): remarks: zse. At the destination end, 45 nm south of the line.
as filed, and in English
```
YKM UA /OV YKM270050/TM 0042/FL150/TP PC12/SK TOP130/RM -ZSE
```
Report
a routine report filed through YKM
Where
50 nm west (270°) of YKM
Time
00:42 UTC
Height
at 15,000 ft
Aircraft
PC12
Sky
TOP130
Remarks
zse

Winds aloft along the route, and the time en route the forecast for use 20:00–03:00 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 9 forecast points nearest it (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	060° at 14 kt	−13 kt	1 °C	133 kt	7 h 36 min	1:38 am PDT (08:38 UTC)
6,500 ft	070° at 12 kt	−11 kt	1 °C	131 kt	7 h 43 min	1:45 am PDT (08:45 UTC)
8,500 ft	090° at 7 kt	−8 kt	-2 °C	128 kt	7 h 53 min	1:55 am PDT (08:55 UTC)
10,500 ft	150° at 4 kt	−3 kt	-4 °C	123 kt	8 h 13 min	2:15 am PDT (09:15 UTC)
12,500 ft	210° at 7 kt	+2 kt	-6 °C	118 kt	8 h 34 min	2:36 am PDT (09:36 UTC)
14,500 ft	210° at 12 kt	+6 kt	-10 °C	114 kt	8 h 52 min	2:54 am PDT (09:54 UTC)
16,500 ft	220° at 17 kt	+9 kt	-13 °C	111 kt	9 h 06 min	3:08 am PDT (10:08 UTC)
18,000 ft FL180	220° at 21 kt	+12 kt	-16 °C	108 kt	9 h 21 min	3:23 am PDT (10:23 UTC)
24,000 ft FL240	230° at 31 kt	+24 kt	-25 °C	96 kt	10 h 31 min	4:33 am PDT (11:33 UTC)
30,000 ft FL300	240° at 47 kt	+38 kt	-37 °C	82 kt	12 h 19 min	6:21 am PDT (13:21 UTC)
34,000 ft FL340	240° at 50 kt	+44 kt	-43 °C	76 kt	13 h 17 min	7:19 am PDT (14:19 UTC)
39,000 ft FL390	250° at 52 kt	+47 kt	-47 °C	73 kt	13 h 50 min	7:52 am PDT (14:52 UTC)

Based on data from the 11th at 18:00 UTC; valid on the 12th at 00:00 UTC for use 20:00 to 03:00 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
GFK	used from 0 nm out; 25 nm from the line	050/18	L/V 10°	240/20 7°	240/36 1°	250/47 -11°	260/53 -21°	270/59 -36°	270/65 -47°	260/88 -56°
MOT	used from 99 nm out; 42 nm from the line		070/8 6°	180/7 2°	220/18 -1°	240/37 -11°	250/55 -20°	250/64 -36°	250/70 -46°	250/80 -54°
DIK	used from 248 nm out; 105 nm from the line		110/15 6°	200/17 5°	230/31 1°	240/47 -10°	240/52 -20°	230/52 -36°	240/57 -45°	250/67 -51°
GGW	used from 297 nm out; 58 nm from the line		090/18 0°	140/12 -2°	150/13 -3°	200/35 -12°	230/56 -22°	240/75 -37°	240/81 -46°	240/78 -49°
GTF	used from 495 nm out; 74 nm from the line		070/21	080/18 -6°	120/5 -5°	180/30 -14°	200/53 -24°	210/80 -38°	220/83 -44°	230/68 -46°
GPI	used from 594 nm out; 64 nm from the line		060/19 -3°	110/11 -8°	130/6 -8°	200/40 -19°	190/58 -28°	200/101 -39°	220/73 -43°	230/41 -43°
GEG	used from 743 nm out; 57 nm from the line		050/18 -2°	060/19 -8°	L/V -11°	160/11 -24°	190/17 -31°	200/19 -35°	220/14 -37°	250/11 -41°
YKM	used from 891 nm out; 77 nm from the line	030/16	020/18 0°	030/30 -8°	030/23 -13°	020/40 -23°	010/73 -29°	010/54 -36°	360/29 -37°	330/16 -40°
SEA	used from 941 nm out; 46 nm from the line	360/9	350/10 1°	010/10 -5°	030/20 -11°	020/60 -17°	010/86 -26°	360/90 -40°	010/68 -42°	360/31 -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
GFK Grand Forks, ND	departure	IFR Sky: overcast at 700 feet Weather: mist	from the north (360°) at 15 knots, gusting to 20	6 mi	700 ft	845 ft	7:53 pm CDT (00:53 UTC)
DVL Devils Lake, ND	69 nm out, 2 nm northwest of the line	marginal VFR Sky: overcast at 1,300 feet	from the north-northeast (030°) at 14 knots, gusting to 22	10+ mi	1,300 ft	1,469 ft	00:56 UTC
MOT Minot, ND	168 nm out, 3 nm east of the line, tower	marginal VFR Sky: a broken layer at 1,800 feet, overcast at 8,000 feet	from the north (010°) at 11 knots	10+ mi	1,800 ft	1,715 ft	00:54 UTC
XWA Williston, ND	267 nm out, 8 nm southeast of the line	IFR Sky: overcast at 900 feet Weather: light rain	from the northeast (050°) at 14 knots	8 mi	900 ft	2,356 ft	00:51 UTC
GGW Glasgow, MT	376 nm out, 14 nm south of the line	VFR Sky: overcast at 3,400 feet Weather: light rain	from the northeast (050°) at 16 knots	10+ mi	3,400 ft	2,295 ft	00:53 UTC
HVR Havre, MT	505 nm out, 7 nm north of the line	IFR Sky: a broken layer at 700 feet, overcast at 1,100 feet Weather: light snow, mist	from the northeast (040°) at 9 knots	5 mi	700 ft	2,591 ft	00:53 UTC
LTY Chester, MT	555 nm out, 7 nm north of the line	no report just now				3,184 ft
GPI Kalispell, MT	683 nm out, 3 nm north of the line, tower	VFR Sky: overcast at 3,400 feet	from the north-northeast (030°) at 13 knots	10+ mi	3,400 ft	2,976 ft	00:55 UTC
SZT Sandpoint, ID	773 nm out, 11 nm north of the line	VFR Sky: scattered clouds at 9,000 feet, a broken layer at 11,000 feet	from the northeast (050°) at 12 knots, gusting to 17	10+ mi	11,000 ft	2,131 ft	00:55 UTC
SFF Spokane, WA	812 nm out, 22 nm south of the line, tower	VFR Sky: overcast at 6,500 feet	from the northeast (050°) at 12 knots, gusting to 19	10+ mi	6,500 ft	1,956 ft	00:53 UTC
EAT Wenatchee, WA	931 nm out, 23 nm south of the line	VFR Sky: overcast at 9,000 feet	variable at 5 knots	10+ mi	9,000 ft	1,248 ft	00:55 UTC
BFI Seattle, WA	destination	VFR	from the northwest (310°) at 6 knots	10+ mi	none	21 ft	5:53 pm PDT (00:53 UTC)

The highest airport on this list sits at 3,184 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, 1:38 am PDT (08:38 UTC)

Wind light and variable, visibility more than 6 miles, clear skies VFR

The whole forecast for BFI

From Sun 5:00 pm PDT (00:00 UTC): wind from the north-northwest at 8 knots, gusting to 18, visibility more than 6 miles, a few clouds at 5,000 feet
From Sun 7:00 pm PDT (02:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind light and variable, 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

The forecast for GFK, the departure

From Sun 8:00 pm CDT (01:00 UTC): wind from the north at 14 knots, visibility more than 6 miles, overcast at 700 feet
From Mon 5:00 am CDT (10:00 UTC): wind from the north-northeast at 11 knots, visibility more than 6 miles, overcast at 600 feet
30% chance between Mon 5:00 am CDT (10:00 UTC) and 11:00 am CDT (16:00 UTC): light rain showers
From Mon 11:00 am CDT (16:00 UTC): wind from the north-northeast at 10 knots, visibility more than 6 miles, light rain showers, overcast at 700 feet

Temporary flight restrictions on the line or within 25 nm of it

6/4348 GRAND FORKS AFB, ND, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local on the route, at the departure end · security · until 1 November · ZMP

Daylight

Sunset at GFK 6:46 pm CDT (23:46 UTC), at BFI 6:27 pm PDT (01:27 UTC) (civil twilight ends 6:58 pm PDT (01:58 UTC)). At 120 knots the arrival at BFI is before sunrise there (7:23 am PDT (14:23 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 northern Rockies · loop National Weather Service

Radar now, the Pacific Northwest · 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: Grand Forks International, Boeing Fld/King County International.