Plan a flight · Mon 4:34 am PDT (11:34 UTC)

Boeing Fld/King County International to General Mitchell International BFI → MKE

1,468 nautical miles (1,689 statute miles) east on a straight line, true course 088°, about 073° magnetic at the departure end (variation 15E). At 120 knots that is 9 h 04 min at the quickest height in today's winds (39,000 ft, a 42-knot tailwind), arriving about 3:38 pm CDT (20:38 UTC). 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

SIGMET C17C: thunderstorms (a convective SIGMET) up to 36,000 ft, moving from the southwest at 40 knots, until 5:55 am PDT (12:55 UTC). Over the route from 859 to 929 nm out.
as issued
```
WSUS32 KKCI 121055
MKCC WST 121055
CONVECTIVE SIGMET 17C
VALID UNTIL 1255Z
SD ND
FROM 20NW BIS-60E BIS-20WNW PIR-20SW DPR-20NW BIS
AREA TS MOV FROM 22040KT. TOPS TO FL360.
```
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 30 to 369 nm out.
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 190 to 639 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 230 to 549 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 369 to 1128 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 659 to 739 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

Not fetched just now.

Winds aloft along the route, and the time en route the forecast for use 08:00–15:00 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 14 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, BIL, MLS, DIK, ABR, AXN, MSP, LSE, GRB, MKG). 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	250° at 6 kt	−5 kt	0 °C	125 kt	11 h 45 min	6:19 pm CDT (23:19 UTC)
7,500 ft	240° at 9 kt	−6 kt	6 °C	126 kt	11 h 39 min	6:13 pm CDT (23:13 UTC)
9,500 ft	240° at 12 kt	−8 kt	2 °C	128 kt	11 h 28 min	6:02 pm CDT (23:02 UTC)
11,500 ft	240° at 14 kt	−10 kt	-1 °C	130 kt	11 h 18 min	5:52 pm CDT (22:52 UTC)
13,500 ft	240° at 15 kt	−11 kt	-4 °C	131 kt	11 h 12 min	5:46 pm CDT (22:46 UTC)
15,500 ft	240° at 16 kt	−12 kt	-8 °C	132 kt	11 h 07 min	5:41 pm CDT (22:41 UTC)
17,500 ft	240° at 17 kt	−13 kt	-12 °C	133 kt	11 h 02 min	5:36 pm CDT (22:36 UTC)
18,000 ft FL180	250° at 18 kt	−13 kt	-13 °C	133 kt	11 h 02 min	5:36 pm CDT (22:36 UTC)
24,000 ft FL240	240° at 23 kt	−18 kt	-25 °C	138 kt	10 h 38 min	5:12 pm CDT (22:12 UTC)
30,000 ft FL300	240° at 27 kt	−20 kt	-37 °C	140 kt	10 h 29 min	5:03 pm CDT (22:03 UTC)
34,000 ft FL340	240° at 38 kt	−30 kt	-40 °C	150 kt	9 h 47 min	4:21 pm CDT (21:21 UTC)
39,000 ft FL390	250° at 48 kt	−42 kt	-45 °C	162 kt	9 h 04 min	3:38 pm CDT (20:38 UTC)

Based on data from the 12th at 06:00 UTC; valid on the 12th at 12:00 UTC for use 08:00 to 15:00 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	350/5	010/6 0°	010/9 -4°	010/27 -6°	010/51 -15°	360/58 -26°	360/60 -41°	350/55 -48°	340/30 -45°
YKM	used from 50 nm out; 60 nm from the line	360/6	360/11 -1°	030/20 -7°	040/21 -11°	020/55 -18°	010/84 -26°	010/79 -40°	010/45 -42°	350/23 -42°
GEG	used from 100 nm out; 68 nm from the line		060/7 -2°	070/12 -6°	050/8 -8°	120/11 -21°	110/18 -33°	030/22 -37°	040/6 -38°	240/7 -41°
GPI	used from 250 nm out; 71 nm from the line		090/8 -4°	140/7 -7°	090/10 -8°	110/10 -19°	210/25 -30°	200/24 -40°	210/31 -39°	210/35 -42°
GTF	used from 349 nm out; 70 nm from the line		L/V	L/V -7°	240/8 -8°	240/30 -14°	240/40 -28°	210/52 -38°	210/76 -38°	220/72 -43°
BIL	used from 549 nm out; 73 nm from the line		300/14	270/19 -2°	260/26 -2°	220/28 -13°	210/51 -25°	220/56 -33°	220/61 -39°	220/72 -45°
MLS	used from 599 nm out; 53 nm from the line		290/17 -1°	250/18 0°	230/25 0°	220/31 -11°	220/32 -24°	220/50 -32°	220/60 -38°	230/71 -46°
DIK	used from 749 nm out; 35 nm from the line		190/12 5°	230/29 7°	220/33 1°	220/43 -11°	210/47 -23°	220/53 -33°	240/56 -40°	250/72 -47°
ABR	used from 899 nm out; 68 nm from the line	080/12	210/12 17°	220/22 12°	230/26 5°	220/28 -10°	230/41 -21°	250/36 -36°	260/47 -39°	260/63 -47°
AXN	used from 1048 nm out; 62 nm from the line	110/6	260/10 16°	240/17 12°	250/20 5°	260/29 -10°	260/35 -22°	260/29 -38°	270/48 -41°	270/61 -48°
MSP	used from 1148 nm out; 46 nm from the line	250/12	250/17 17°	240/26 12°	250/26 5°	280/26 -9°	280/32 -22°	270/37 -38°	280/47 -41°	280/55 -48°
LSE	used from 1248 nm out; 38 nm from the line	250/25	240/21 17°	240/28 11°	250/28 5°	280/24 -10°	280/31 -21°	260/35 -37°	270/45 -43°	280/59 -47°
GRB	used from 1398 nm out; 81 nm from the line	250/32	250/22 17°	240/18 8°	280/21 6°	280/34 -11°	280/35 -21°	280/39 -37°	270/52 -45°	290/60 -49°
MKG	used from 1448 nm out; 83 nm from the line	260/28	260/18 15°	250/16 9°	260/22 4°	280/31 -9°	270/35 -21°	270/44 -35°	270/42 -45°	290/61 -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	Elevation
BFI Seattle, WA	departure	no report just now	21 ft
MWH Moses Lake, WA	120 nm out, 21 nm south of the line, tower	no report just now	1,188 ft
GEG Spokane, WA	190 nm out, 6 nm northeast of the line, tower	no report just now	2,385 ft
GTF Great Falls, MT	439 nm out, 13 nm north of the line, tower	no report just now	3,680 ft
LWT Lewistown, MT	519 nm out, 5 nm southeast of the line	no report just now	4,170 ft
MLS Miles City, MT	679 nm out, 19 nm southwest of the line	no report just now	2,634 ft
BHK Baker, MT	739 nm out, 11 nm south of the line	no report just now	2,980 ft
ABR Aberdeen, SD	989 nm out, 7 nm south of the line	no report just now	1,301 ft
MVE Montevideo, MN	1108 nm out, 2 nm south of the line	no report just now	1,034 ft
LSE La Crosse, WI	1308 nm out, 4 nm southeast of the line, tower	no report just now	655 ft
UES Waukesha, WI	1448 nm out, 4 nm southeast of the line, tower	no report just now	911 ft
MKE Milwaukee, WI	destination	no report just now	728 ft

The highest airport on this list sits at 4,170 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At MKE when you get there the forecast at the estimated arrival, 3:38 pm CDT (20:38 UTC)

MKE has no terminal forecast; use the nearest airport that does.

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

6/8923 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local 19 nm from the route, 320 nm along the route · a VIP movement · starts Wednesday 14 October · ZLC
6/8927 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local 2 nm from the route, 339 nm along the route · a VIP movement · starts Wednesday 14 October · ZSE

Daylight

Sunset at BFI 6:25 pm PDT (01:25 UTC), at MKE 6:14 pm CDT (23:14 UTC) (civil twilight ends 6:42 pm CDT (23:42 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 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: Boeing Fld/King County International, General Mitchell International.