Plan a flight · Sun 6:14 pm PDT (01:14 UTC)

Boeing Fld/King County International to Chicago O'Hare International BFI → ORD

1,491 nautical miles (1,716 statute miles) east on a straight line, true course 090°, about 075° magnetic at the departure end (variation 15E). At 120 knots that is 8 h 49 min at the quickest height in today's winds (39,000 ft, a 49-knot tailwind), arriving about 5:03 am CDT (10:03 UTC), after sunset at the destination. Right now BFI is VFR, wind from the northwest (310°) at 6 knots; ORD is VFR, wind from the south (180°) at 7 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: 3 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 25,000 ft to 39,000 ft. Over the first 0 nm of the route.
AIRMET ZULU 2C: moderate icing up to 14,000 ft. Over the route from 119 to 348 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 199 to 567 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 248 to 895 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 258 to 785 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

E75L at 14,000 ft, 42 nm south, 4:22 pm PDT (23:22 UTC): moderate turbulence from 14,000 ft to 21,000 ft, remarks: during the climb zlc. 338 nm along the route, 42 nm south of the line.
as filed, and in English
```
MSO UA /OV 32S/TM 2322/FL140/TP E75L/TB MOD 140-210/RM DURC /ZLC
```
Report
a routine report filed through MSO
Where
over 32S
Time
23:22 UTC
Height
at 14,000 ft
Aircraft
E75L
Turbulence
moderate from 14,000 ft to 21,000 ft
Remarks
during the climb zlc
PC12 at 13,000 ft, 40 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 40 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, 40 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 40 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
C172 at 5,500 ft, 46 nm south, 3:17 pm PDT (22:17 UTC): a trace of rime icing, 0 °C, remarks: zse. 179 nm along the route, 46 nm south of the line.
as filed, and in English
```
PUW UA /OV PUW250030/TM 2217/FL055/TP C172/TA 00/IC TRACE RIME/RM -ZSE
```
Report
a routine report filed through PUW
Where
30 nm west (250°) of PUW
Time
22:17 UTC
Height
at 5,500 ft
Aircraft
C172
Temperature
0 °C
Icing
trace rime
Remarks
zse
C25B at 4,100 ft, 19 nm south, 5:36 pm PDT (00:36 UTC): no icing, overcast above 4,100 ft, remarks: during the descent ils runway 12. 338 nm along the route, 19 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
B39M at 35,000 ft, 17 nm north, 4:28 pm PDT (23:28 UTC): light chop turbulence. 984 nm along the route, 17 nm north of the line.
as filed, and in English
```
ABR UA /OV ABR230015/TM 2328/FL350/TP B39M/TB LGT CHOP
```
Report
a routine report filed through ABR
Where
15 nm southwest (230°) of ABR
Time
23:28 UTC
Height
at 35,000 ft
Aircraft
B39M
Turbulence
light chop
BE20 at 14,000 ft, 21 nm south, 5:20 pm PDT (00:20 UTC): light turbulence. 1073 nm along the route, 21 nm south of the line.
as filed, and in English
```
FSD UA /OV FSD340035/TM 0020/FL140/TP BE20/TB CONS LGT/ NEG 120
```
Report
a routine report filed through FSD
Where
35 nm north (340°) of FSD
Time
00:20 UTC
Height
at 14,000 ft
Aircraft
BE20
Turbulence
continuous light no at 12,000 ft
B39M at 34,000 ft, 41 nm north, 4:25 pm PDT (23:25 UTC): light chop turbulence. 1183 nm along the route, 41 nm north of the line.
as filed, and in English
```
MSP UA /OV MSP240040/TM 2325/FL340/TP B39M/TB LGT CHOP
```
Report
a routine report filed through MSP
Where
40 nm southwest (240°) of MSP
Time
23:25 UTC
Height
at 34,000 ft
Aircraft
B39M
Turbulence
light chop
B737 at 32,000 ft, 44 nm north, 3:42 pm PDT (22:42 UTC): light clear-air turbulence. 1421 nm along the route, 44 nm north of the line.
as filed, and in English
```
UES UA /OV BAE270030/TM 2242/FL320/TP B737/TB OCNL LGT CAT
```
Report
a routine report filed through UES
Where
30 nm west (270°) of BAE
Time
22:42 UTC
Height
at 32,000 ft
Aircraft
B737
Turbulence
occasional light clear-air turbulence
B39M at 35,000 ft, 32 nm southeast, 5:29 pm PDT (00:29 UTC): no turbulence, remarks: smooth. At the destination end, 32 nm southeast of the line.
as filed, and in English
```
IKK UA /OV CGT/TM 0029/FL350/TP B39M/TB NEG/RM SMOOTH
```
Report
a routine report filed through IKK
Where
over CGT
Time
00:29 UTC
Height
at 35,000 ft
Aircraft
B39M
Turbulence
none
Remarks
smooth
CRJ7 at 17,000 ft, 41 nm east, 5:04 pm PDT (00:04 UTC): no turbulence. At the destination end, 41 nm east of the line.
as filed, and in English
```
BEH UA /OV ELX270040/TM 0004/FL170/TP CRJ7/TB NEG
```
Report
a routine report filed through BEH
Where
40 nm west (270°) of ELX
Time
00:04 UTC
Height
at 17,000 ft
Aircraft
CRJ7
Turbulence
none

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 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 15 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, BIL, MLS, DIK, PIR, ABR, FSD, MCW, LSE, DBQ, JOT). 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	120° at 4 kt	+5 kt	4 °C	115 kt	12 h 58 min	9:12 am CDT (14:12 UTC)
7,500 ft	180° at 3 kt	+2 kt	7 °C	118 kt	12 h 38 min	8:52 am CDT (13:52 UTC)
9,500 ft	210° at 6 kt	−1 kt	3 °C	121 kt	12 h 19 min	8:33 am CDT (13:33 UTC)
11,500 ft	220° at 11 kt	−4 kt	0 °C	124 kt	12 h 01 min	8:15 am CDT (13:15 UTC)
13,500 ft	220° at 14 kt	−7 kt	-3 °C	127 kt	11 h 44 min	7:58 am CDT (12:58 UTC)
15,500 ft	230° at 17 kt	−10 kt	-7 °C	130 kt	11 h 28 min	7:42 am CDT (12:42 UTC)
17,500 ft	230° at 21 kt	−13 kt	-12 °C	133 kt	11 h 13 min	7:27 am CDT (12:27 UTC)
18,000 ft FL180	230° at 21 kt	−14 kt	-13 °C	134 kt	11 h 08 min	7:22 am CDT (12:22 UTC)
24,000 ft FL240	240° at 28 kt	−20 kt	-23 °C	140 kt	10 h 39 min	6:53 am CDT (11:53 UTC)
30,000 ft FL300	240° at 35 kt	−25 kt	-36 °C	145 kt	10 h 17 min	6:31 am CDT (11:31 UTC)
34,000 ft FL340	250° at 42 kt	−36 kt	-43 °C	156 kt	9 h 33 min	5:47 am CDT (10:47 UTC)
39,000 ft FL390	260° at 52 kt	−49 kt	-48 °C	169 kt	8 h 49 min	5:03 am CDT (10:03 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
SEA	used from 0 nm out; 26 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°
YKM	used from 50 nm out; 57 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°
GEG	used from 99 nm out; 70 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°
GPI	used from 248 nm out; 80 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°
GTF	used from 348 nm out; 75 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°
BIL	used from 497 nm out; 73 nm from the line		080/24	130/14 -1°	180/33 0°	210/43 -10°	220/58 -21°	200/55 -36°	220/75 -44°	240/83 -48°
MLS	used from 596 nm out; 54 nm from the line		120/22 5°	170/18 4°	200/33 1°	230/49 -10°	230/58 -21°	220/54 -37°	230/64 -44°	250/74 -49°
DIK	used from 745 nm out; 62 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°
PIR	used from 845 nm out; 84 nm from the line		L/V 17°	230/13 12°	220/22 6°	250/31 -9°	250/34 -21°	240/50 -35°	230/61 -43°	240/62 -51°
ABR	used from 944 nm out; 37 nm from the line	030/24	220/5 16°	230/18 12°	230/32 5°	240/38 -10°	250/37 -20°	240/40 -35°	240/56 -44°	250/72 -52°
FSD	used from 1044 nm out; 60 nm from the line	200/16	220/20 17°	240/26 13°	230/19 6°	240/25 -9°	240/28 -20°	250/39 -33°	250/44 -43°	260/63 -52°
MCW	used from 1143 nm out; 80 nm from the line	200/35	240/33 18°	250/20 10°	260/10 6°	270/18 -8°	260/28 -19°	280/30 -34°	290/49 -43°	280/70 -54°
LSE	used from 1292 nm out; 46 nm from the line	220/33	250/29 17°	250/15 9°	260/12 6°	280/21 -9°	280/33 -20°	300/43 -36°	310/56 -45°	300/79 -53°
DBQ	used from 1342 nm out; 27 nm from the line	220/23	240/22 16°	240/24 10°	260/18 5°	270/16 -8°	290/27 -19°	310/42 -35°	320/55 -44°	300/71 -52°
JOT	used from 1441 nm out; 39 nm from the line	230/11	290/12 16°	300/19 10°	320/19 4°	300/17 -9°	330/31 -20°	320/49 -37°	320/53 -45°	320/67 -49°

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	from the northwest (310°) at 6 knots	10+ mi	none	21 ft	5:53 pm PDT (00:53 UTC)
MWH Moses Lake, WA	119 nm out, 17 nm south of the line, tower	VFR Sky: overcast at 10,000 feet	from the northeast (050°) at 13 knots, gusting to 18	10+ mi	10,000 ft	1,188 ft	00:52 UTC
GEG Spokane, WA	189 nm out, 12 nm north of the line, tower	VFR Sky: a few clouds at 4,500 feet, a broken layer at 5,500 feet, a broken layer at 10,000 feet	from the northeast (040°) at 15 knots	10+ mi	5,500 ft	2,385 ft	00:53 UTC
MSO Missoula, MT	338 nm out, 18 nm south of the line, tower	marginal VFR Sky: a few clouds at 800 feet, overcast at 2,400 feet Weather: light rain	from the north (010°) at 4 knots	7 mi	2,400 ft	3,205 ft	01:10 UTC
RPX Roundup, MT	567 nm out, 12 nm south of the line	no report just now				3,490 ft
MLS Miles City, MT	676 nm out, 7 nm north of the line	IFR Sky: a broken layer at 800 feet, overcast at 1,300 feet Weather: light rain	from the east-northeast (060°) at 11 knots	10+ mi	800 ft	2,634 ft	00:53 UTC
LEM Lemmon, SD	835 nm out, 14 nm north of the line	no report just now				2,572 ft
MBG Mobridge, SD	904 nm out, 12 nm northeast of the line	marginal VFR Sky: overcast at 1,300 feet	from the north-northeast (030°) at 8 knots	10+ mi	1,300 ft	1,716 ft	00:52 UTC
JYG St James, MN	1173 nm out, 2 nm southeast of the line	VFR	from the south (190°) at 7 knots	10+ mi	none	1,067 ft	00:55 UTC
AEL Albert Lea, MN	1232 nm out, 3 nm northwest of the line	VFR Sky: a few clouds at 35,000 feet	from the south (170°) at 8 knots	10+ mi	none	1,261 ft	00:55 UTC
RFD Chicago/Rockford, IL	1441 nm out, 11 nm southwest of the line, tower	VFR Sky: a few clouds at 25,000 feet	calm	10+ mi	none	742 ft	00:54 UTC
ORD Chicago, IL	destination	VFR Sky: a few clouds at 25,000 feet	from the south (180°) at 7 knots	10+ mi	none	680 ft	7:51 pm CDT (00:51 UTC)

The highest airport on this list sits at 3,490 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At ORD when you get there the forecast at the estimated arrival, 5:03 am CDT (10:03 UTC)

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

The whole forecast for ORD

From Sun 7:00 pm CDT (00:00 UTC): wind from the south at 6 knots, visibility more than 6 miles, clear skies
From Mon 12:00 pm CDT (17:00 UTC): wind from the south-southwest at 13 knots, gusting to 23, visibility more than 6 miles, scattered clouds at 20,000 feet
From Mon 6:00 pm CDT (23:00 UTC): wind from the south-southwest at 12 knots, visibility more than 6 miles, a few clouds at 12,000 feet

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 ORD 6:15 pm CDT (23:15 UTC) (civil twilight ends 6:43 pm CDT (23:43 UTC)). At 120 knots the arrival at ORD is before sunrise there (7:00 am CDT (12:00 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, Chicago O'Hare International.