Plan a flight · Sun 10:37 pm CDT (03:37 UTC)

Kansas City International to Boeing Fld/King County International MCI → BFI

1,292 nautical miles (1,487 statute miles) northwest on a straight line, true course 302°, about 300° magnetic at the departure end (variation 2E). At 120 knots that is 10 h 25 min at the quickest height in today's winds (4,500 ft, a 4-knot tailwind), arriving about 7:02 am PDT (14:02 UTC), after sunset at the destination. Right now MCI is VFR, wind from the south (180°) at 12 knots; BFI is VFR, wind calm. 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: 5 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 2C: thunderstorms (a convective SIGMET) up to 31,000 ft, moving from the southwest at 40 knots, until 11:55 pm CDT (04:55 UTC). Near the route, 557 nm along the route.
as issued
```
WSUS32 KKCI 120255
MKCC WST 120255
CONVECTIVE SIGMET 2C
VALID UNTIL 0455Z
NE CO WY
FROM 40SE CZI-30WNW BFF-30SSE LAR-70NW LAR-40SE CZI
AREA TS MOV FROM 22040KT. TOPS TO FL310.
```
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 first 209 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 388 to 706 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 517 to 795 nm out.
AIRMET TANGO 1W: 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 557 to 726 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 586 to 1064 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 596 to 924 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 626 to 805 nm out.
AIRMET ZULU 2C: moderate icing up to 20,000 ft. Over the route from 815 to 1232 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 845 to 1044 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 149 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 MCI.

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

S22T at 15,000 ft, 48 nm southwest, 8:47 pm CDT (01:47 UTC): moderate rime icing above 15,000 ft, -5 °C. 745 nm along the route, 48 nm southwest of the line.
as filed, and in English
```
JAC UA /OV DNW010020/TM 0147/FL150/TP S22T/TA M05/IC MOD RIME 150 /ZLC
```
Report
a routine report filed through JAC
Where
20 nm north (010°) of DNW
Time
01:47 UTC
Height
at 15,000 ft
Aircraft
S22T
Temperature
−5 °C
Icing
moderate rime at 15,000 ft zlc
UAL1076 at 30,000 ft, 14 nm south, 9:36 pm CDT (02:36 UTC): light turbulence, wind 225° at 60 knots. 656 nm along the route, 14 nm south of the line.
as filed, and in English
```
ARP UAL1076 4405N 10749W 0236 F300 225/060KT TB CONT LGT TURB IC
```
Report
a routine report filed through ARP
E75L descending, 29 nm northeast, 8:04 pm CDT (01:04 UTC): remarks: had the airport in sight at 400-500FT above ground. 825 nm along the route, 29 nm northeast of the line.
as filed, and in English
```
BZN UA /OV BZN/TM 0104/FLDURD/TP E75L/RM HAD THE AIRPORT IN SIGHT AT 400-500FT AGL
```
Report
a routine report filed through BZN
Where
over BZN
Time
01:04 UTC
Height
during the descent
Aircraft
E75L
Remarks
had the airport in sight at 400-500FT above ground
PC12 at 13,500 ft, 19 nm southwest, 8:08 pm CDT (01:08 UTC): no turbulence, a trace of icing, overcast from 9,000 ft to 13,500 ft, -10 °C. 1143 nm along the route, 19 nm southwest of the line.
as filed, and in English
```
PSC UA /OV PSC360025/TM 0108/FL135/TP PC12/SK OVC090-TOP135/TA M10/TB NEG /IC TRACE RM 135-090
```
Report
a routine report filed through PSC
Where
25 nm north (360°) of PSC
Time
01:08 UTC
Height
at 13,500 ft
Aircraft
PC12
Sky
overcast from 9,000 ft, tops 13,500 ft
Temperature
−10 °C
Turbulence
none
Icing
trace remarks from 13,500 ft to 9,000 ft
A321 at 13,500 ft, 33 nm south, 8:54 pm CDT (01:54 UTC): remarks: zse. At the destination end, 33 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
SB20 at 16,000 ft, 29 nm north, 8:52 pm CDT (01:52 UTC): remarks: zse. At the destination end, 29 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
PC12 at 13,000 ft, 33 nm south, 7:42 pm CDT (00:42 UTC): remarks: zse. At the destination end, 33 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, 33 nm south, 7:42 pm CDT (00:42 UTC): remarks: zse. At the destination end, 33 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 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 13 forecast points nearest it (MKC, OMA, GRI, ONL, BFF, RAP, LND, BIL, DLN, LWS, 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	190° at 12 kt	−4 kt	15 °C	124 kt	10 h 25 min	7:02 am PDT (14:02 UTC)
6,500 ft	200° at 10 kt	−3 kt	9 °C	123 kt	10 h 30 min	7:07 am PDT (14:07 UTC)
8,500 ft	210° at 9 kt	0	4 °C	120 kt	10 h 46 min	7:23 am PDT (14:23 UTC)
10,500 ft	220° at 12 kt	+2 kt	2 °C	118 kt	10 h 57 min	7:34 am PDT (14:34 UTC)
12,500 ft	220° at 16 kt	+3 kt	-1 °C	117 kt	11 h 03 min	7:40 am PDT (14:40 UTC)
14,500 ft	220° at 18 kt	+4 kt	-6 °C	116 kt	11 h 08 min	7:45 am PDT (14:45 UTC)
16,500 ft	220° at 19 kt	+5 kt	-10 °C	115 kt	11 h 14 min	7:51 am PDT (14:51 UTC)
18,000 ft FL180	220° at 21 kt	+6 kt	-13 °C	114 kt	11 h 20 min	7:57 am PDT (14:57 UTC)
24,000 ft FL240	220° at 25 kt	+7 kt	-24 °C	113 kt	11 h 26 min	8:03 am PDT (15:03 UTC)
30,000 ft FL300	240° at 32 kt	+15 kt	-34 °C	105 kt	12 h 18 min	8:55 am PDT (15:55 UTC)
34,000 ft FL340	250° at 41 kt	+26 kt	-38 °C	94 kt	13 h 45 min	10:22 am PDT (17:22 UTC)
39,000 ft FL390	250° at 46 kt	+31 kt	-44 °C	89 kt	14 h 31 min	11:08 am PDT (18:08 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
MKC	used from 0 nm out; 36 nm from the line	220/44	250/28 18°	250/18 13°	240/12 6°	280/24 -6°	240/34 -18°	260/47 -30°	260/51 -40°	270/58 -50°
OMA	used from 50 nm out; 82 nm from the line	220/47	240/33 19°	250/18 11°	230/17 6°	260/29 -8°	250/33 -19°	250/51 -33°	260/61 -40°	270/62 -49°
GRI	used from 99 nm out; 69 nm from the line		230/35 21°	230/23 13°	220/20 7°	240/25 -8°	240/37 -20°	250/49 -33°	260/57 -38°	260/58 -47°
ONL	used from 248 nm out; 77 nm from the line		210/31 20°	230/27 13°	230/18 7°	220/19 -8°	240/26 -20°	250/44 -35°	270/52 -39°	260/57 -47°
BFF	used from 348 nm out; 81 nm from the line		180/28	220/33 15°	210/31 7°	230/32 -9°	220/41 -21°	220/40 -33°	240/47 -36°	250/54 -46°
RAP	used from 447 nm out; 70 nm from the line		180/23 12°	200/38 13°	210/38 6°	220/28 -10°	230/34 -21°	230/37 -36°	250/52 -38°	250/59 -46°
LND	used from 596 nm out; 106 nm from the line			200/23 6°	220/31 1°	220/39 -11°	230/39 -23°	220/51 -28°	220/66 -37°	230/68 -45°
BIL	used from 646 nm out; 86 nm from the line		080/13	180/9 -2°	210/38 0°	220/51 -11°	210/46 -22°	210/58 -35°	230/73 -39°	230/72 -45°
DLN	used from 795 nm out; 51 nm from the line			090/6 -6°	240/22 -4°	210/34 -16°	210/62 -25°	210/66 -34°	210/82 -36°	220/77 -42°
LWS	used from 944 nm out; 97 nm from the line	070/10	080/12 -2°	030/12 -6°	080/7 -10°	170/34 -21°	160/46 -32°	200/33 -35°	220/22 -35°	230/18 -38°
GEG	used from 1093 nm out; 54 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 1143 nm out; 57 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 1242 nm out; 25 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
MCI Kansas City, MO	departure	VFR	from the south (180°) at 12 knots	10+ mi	none	1,027 ft	9:53 pm CDT (02:53 UTC)
STJ St Joseph, MO	20 nm out, 20 nm northeast of the line, tower	VFR	from the south (180°) at 8 knots	10+ mi	none	826 ft	02:53 UTC
GRI Grand Island, NE	189 nm out, 5 nm northwest of the line, tower	VFR	from the south (170°) at 9 knots	10+ mi	none	1,847 ft	02:53 UTC
TIF Thedford, NE	308 nm out, 8 nm north of the line	VFR	from the northeast (050°) at 6 knots	10+ mi	none	2,925 ft	03:15 UTC
CDR Chadron, NE	437 nm out, 4 nm northeast of the line	VFR	from the north-northeast (020°) at 8 knots	10+ mi	none	3,297 ft	02:53 UTC
BYG Buffalo, WY	616 nm out, 21 nm northeast of the line	low IFR Sky: overcast at 200 feet Weather: mist	calm	1.25 mi	200 ft	4,970 ft	03:30 UTC
GEY Greybull, WY	676 nm out, 7 nm northeast of the line	marginal VFR Sky: overcast at 1,200 feet	from the west-northwest (300°) at 14 knots, gusting to 21	10+ mi	1,200 ft	3,941 ft	03:05 UTC
RVF Twin Bridges, MT	865 nm out, 3 nm southeast of the line	IFR Sky: scattered clouds at 700 feet, a broken layer at 2,400 feet, overcast at 3,100 feet Weather: mist	from the north-northeast (030°) at 22 knots, gusting to 28	1.5 mi	2,400 ft	4,788 ft	03:10 UTC
HRF Hamilton, MT	944 nm out, 16 nm north of the line	low IFR Sky: overcast at 300 feet Weather: light snow, mist	from the north (350°) at 7 knots	1.5 mi	300 ft	3,635 ft	03:15 UTC
LWS Lewiston, ID	1064 nm out, 14 nm southwest of the line, tower	VFR Sky: overcast at 6,000 feet	from the west-northwest (300°) at 6 knots	10+ mi	6,000 ft	1,442 ft	02:56 UTC
MWH Moses Lake, WA	1173 nm out, 10 nm northeast of the line, tower	VFR Sky: scattered clouds at 8,500 feet, overcast at 11,000 feet	from the north-northwest (330°) at 3 knots	10+ mi	11,000 ft	1,188 ft	02:52 UTC
BFI Seattle, WA	destination	VFR	calm	10+ mi	none	21 ft	7:53 pm PDT (02:53 UTC)

The highest airport on this list sits at 4,970 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, 7:02 am PDT (14:02 UTC)

Wind calm, visibility more than 6 miles, patches of fog, clear skies VFR

The whole forecast for BFI

From Sun 8:00 pm PDT (03:00 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

The forecast for MCI, the departure

From Sun 7:00 pm CDT (00:00 UTC): wind from the south at 11 knots, gusting to 20, visibility more than 6 miles, scattered clouds at 25,000 feet
From Mon 9:00 am CDT (14:00 UTC): wind from the south-southwest at 17 knots, gusting to 26, visibility more than 6 miles, scattered clouds at 25,000 feet

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 MCI 6:44 pm CDT (23:44 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 upper Mississippi valley · loop National Weather Service

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: Kansas City International, Boeing Fld/King County International.