Plan a flight · Sun 7:36 pm PDT (02:36 UTC)

Boeing Fld/King County International to Bismarck Municipal BFI → BIS

879 nautical miles (1,011 statute miles) east on a straight line, true course 085°, about 070° magnetic at the departure end (variation 15E). At 120 knots that is 5 h 36 min at the quickest height in today's winds (39,000 ft, a 37-knot tailwind), arriving about 3:12 am CDT (08:12 UTC), after sunset at the destination. Right now BFI is VFR, wind calm; BIS is marginal VFR, wind from the northeast (050°) at 11 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 TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 160 nm of the route.
AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 110 to 489 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 240 to 529 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 270 to 839 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 290 to 859 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

A321 at 13,500 ft, 42 nm south, 6:54 pm PDT (01:54 UTC): remarks: zse. At the departure end, 42 nm south of the line.
as filed, and in English
```
SEA UA /OV SEA120045/TM 0154/FL135/TP A321/SK TOP130/RM ZSE
```
Report
a routine report filed through SEA
Where
45 nm southeast (120°) of SEA
Time
01:54 UTC
Height
at 13,500 ft
Aircraft
A321
Sky
TOP130
Remarks
zse
PC12 at 13,000 ft, 43 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 43 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, 43 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 43 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
SB20 at 16,000 ft, 16 nm north, 6:52 pm PDT (01:52 UTC): remarks: zse. 50 nm along the route, 16 nm north of the line.
as filed, and in English
```
PAE UA /OV PAE075045/TM 0152/FL160/TP SB20/SK TOP120/RM ZSE
```
Report
a routine report filed through PAE
Where
45 nm east (075°) of PAE
Time
01:52 UTC
Height
at 16,000 ft
Aircraft
SB20
Sky
TOP120
Remarks
zse
BCS1 at 3,700 ft, 49 nm south, 6:47 pm PDT (01:47 UTC): snow, rain, remarks: during the descent ils runway 12. 329 nm along the route, 49 nm south of the line.
as filed, and in English
```
MSO UA /OV MSO/TM 0147/FL037/TP BCS1/SK 037/WX SN RA/RM DURD ILS RY 12
```
Report
a routine report filed through MSO
Where
over MSO
Time
01:47 UTC
Height
at 3,700 ft
Aircraft
BCS1
Sky
at 3,700 ft
Weather
snow, rain
Remarks
during the descent ils runway 12
E75L descending, 35 nm north, 6:06 pm PDT (01:06 UTC): overcast above 4,000 ft. 329 nm along the route, 35 nm north of the line.
as filed, and in English
```
GPI UA /OV KGPI/TM 0106/FLDURD/TP E75L/SK OVC040
```
Report
a routine report filed through GPI
Where
over KGPI
Time
01:06 UTC
Height
during the descent
Aircraft
E75L
Sky
overcast from 4,000 ft
C25B at 4,100 ft, 49 nm south, 5:36 pm PDT (00:36 UTC): no icing, overcast above 4,100 ft, remarks: during the descent ils runway 12. 329 nm along the route, 49 nm south of the line.
as filed, and in English
```
MSO UA /OV MSO/TM 0036/FL041/TP C25B/SK OVC041/IC NEG/RM DURD ILS RY 12
```
Report
a routine report filed through MSO
Where
over MSO
Time
00:36 UTC
Height
at 4,100 ft
Aircraft
C25B
Sky
overcast from 4,100 ft
Icing
none
Remarks
during the descent ils runway 12
CRJ2 at 2,900 ft, 10 nm southwest, 5:05 pm PDT (00:05 UTC): a routine report with nothing remarked on. 799 nm along the route, 10 nm southwest of the line.
as filed, and in English
```
DIK UA /OV DIK/TM 0005/FL029/TP CRJ2/SK BASE029
```
Report
a routine report filed through DIK
Where
over DIK
Time
00:05 UTC
Height
at 2,900 ft
Aircraft
CRJ2
Sky
BASE029
B789 at 35,000 ft, 12 nm north, 6:57 pm PDT (01:57 UTC): light turbulence. 819 nm along the route, 12 nm north of the line.
as filed, and in English
```
DIK UA /OV DIK040030/TM 0157/FL350/TP B789/TB CONS LGT/ OCNL MOD CHOP/ NEG 370
```
Report
a routine report filed through DIK
Where
30 nm northeast (040°) of DIK
Time
01:57 UTC
Height
at 35,000 ft
Aircraft
B789
Turbulence
continuous light occasional moderate chop no at 37,000 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 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 8 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, GGW, MLS, DIK). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
5,500 ft	100° at 14 kt	+15 kt	0 °C	105 kt	8 h 22 min	5:58 am CDT (10:58 UTC)
7,500 ft	110° at 12 kt	+12 kt	-1 °C	108 kt	8 h 08 min	5:44 am CDT (10:44 UTC)
9,500 ft	140° at 10 kt	+8 kt	-4 °C	112 kt	7 h 51 min	5:27 am CDT (10:27 UTC)
11,500 ft	170° at 10 kt	+3 kt	-6 °C	117 kt	7 h 31 min	5:07 am CDT (10:07 UTC)
13,500 ft	190° at 13 kt	−1 kt	-8 °C	121 kt	7 h 16 min	4:52 am CDT (09:52 UTC)
15,500 ft	210° at 16 kt	−5 kt	-11 °C	125 kt	7 h 02 min	4:38 am CDT (09:38 UTC)
17,500 ft	220° at 19 kt	−9 kt	-14 °C	129 kt	6 h 49 min	4:25 am CDT (09:25 UTC)
18,000 ft FL180	220° at 20 kt	−10 kt	-15 °C	130 kt	6 h 46 min	4:22 am CDT (09:22 UTC)
24,000 ft FL240	210° at 24 kt	−9 kt	-25 °C	129 kt	6 h 49 min	4:25 am CDT (09:25 UTC)
30,000 ft FL300	220° at 25 kt	−13 kt	-38 °C	133 kt	6 h 37 min	4:13 am CDT (09:13 UTC)
34,000 ft FL340	230° at 34 kt	−23 kt	-41 °C	143 kt	6 h 09 min	3:45 am CDT (08:45 UTC)
39,000 ft FL390	240° at 47 kt	−37 kt	-44 °C	157 kt	5 h 36 min	3:12 am CDT (08:12 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; 63 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; 68 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; 62 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 399 nm out; 21 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 549 nm out; 75 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°
MLS	used from 649 nm out; 54 nm from the line		150/23 2°	190/29 4°	210/44 2°	220/32 -10°	210/36 -21°	200/48 -37°	230/63 -40°	240/71 -47°
DIK	used from 699 nm out; 72 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°

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 Sky: a few clouds at 6,000 feet	calm	10+ mi	none	21 ft	6:53 pm PDT (01:53 UTC)
EAT Wenatchee, WA	80 nm out, 15 nm south of the line	VFR Sky: overcast at 8,500 feet	variable at 5 knots	10+ mi	8,500 ft	1,248 ft	01:55 UTC
EPH Ephrata, WA	110 nm out, 21 nm south of the line	VFR Sky: overcast at 8,000 feet	from the north-northeast (030°) at 5 knots	10+ mi	8,000 ft	1,276 ft	01:53 UTC
SFF Spokane, WA	200 nm out, 3 nm southeast of the line, tower	VFR Sky: overcast at 8,000 feet	from the northeast (050°) at 4 knots	10+ mi	8,000 ft	1,956 ft	01:53 UTC
THM Thompson Falls, MT	280 nm out, 11 nm southeast of the line	no report just now				2,467 ft
GTF Great Falls, MT	439 nm out, 11 nm south of the line, tower	low IFR Sky: overcast at 500 feet Weather: light snow, mist	from the north (010°) at 11 knots	0.75 mi	500 ft	3,680 ft	02:06 UTC
JDN Jordan, MT	619 nm out, 6 nm southeast of the line	reported, no category	from the northeast (050°) at 14 knots		none	2,667 ft	01:48 UTC
GDV Glendive, MT	709 nm out, 6 nm south of the line	low IFR Sky: overcast at 400 feet Weather: light rain, mist	from the east-northeast (060°) at 13 knots	4 mi	400 ft	2,458 ft	01:56 UTC
DIK Dickinson, ND	799 nm out, 14 nm southwest of the line	IFR Sky: overcast at 500 feet Weather: light rain	from the northeast (050°) at 13 knots, gusting to 20	8 mi	500 ft	2,592 ft	01:56 UTC
BIS Bismarck, ND	destination	marginal VFR Sky: overcast at 1,300 feet	from the northeast (050°) at 11 knots	10+ mi	1,300 ft	1,661 ft	8:52 pm CDT (01:52 UTC)

The highest airport on this list sits at 3,680 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BIS when you get there the forecast at the estimated arrival, 3:12 am CDT (08:12 UTC)

Wind from the northeast at 9 knots, visibility more than 6 miles, overcast at 800 feet IFR

30% chance between Mon 1:00 am CDT (06:00 UTC) and 4:00 am CDT (09:00 UTC): visibility 5 miles, light rain, mist marginal VFR

The whole forecast for BIS

From Sun 7:00 pm CDT (00:00 UTC): wind from the north-northeast at 12 knots, gusting to 20, visibility more than 6 miles, overcast at 1,400 feet
From Sun 11:00 pm CDT (04:00 UTC): wind from the northeast at 9 knots, visibility more than 6 miles, overcast at 800 feet
30% chance between Mon 1:00 am CDT (06:00 UTC) and 4:00 am CDT (09:00 UTC): visibility 5 miles, light rain, mist
From Mon 4:00 am CDT (09:00 UTC): wind from the northeast at 7 knots, visibility 5 miles, light rain, mist, overcast at 600 feet
From Mon 11:00 am CDT (16:00 UTC): wind from the north-northeast at 6 knots, visibility more than 6 miles, overcast at 900 feet
30% chance between Mon 11:00 am CDT (16:00 UTC) and 4:00 pm CDT (21:00 UTC): visibility 5 miles, light rain, mist

The forecast for BFI, the departure

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

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

No temporary flight restriction on or near this route right now.

Daylight

Sunset at BFI 6:27 pm PDT (01:27 UTC), at BIS 7:01 pm CDT (00:01 UTC) (civil twilight ends 7:32 pm CDT (00:32 UTC)). At 120 knots the arrival at BIS is before sunrise there (7:56 am CDT (12:56 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 Pacific Northwest · loop National Weather Service

Radar now, the northern Rockies · 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: Boeing Fld/King County International, Bismarck Municipal.