Plan a flight · Mon 3:07 am EDT (07:07 UTC)

Washington Dulles International to Boeing Fld/King County International IAD → BFI

1,998 nautical miles (2,299 statute miles) northwest on a straight line, true course 300°, about 310° magnetic at the departure end (variation 10W). At 120 knots that is 16 h 47 min at the quickest height in today's winds (4,500 ft, a 1-knot headwind), arriving about 4:54 pm PDT (23:54 UTC). Right now IAD is IFR, wind from the north-northwest (340°) at 11 knots; BFI is VFR, wind from the south-southeast (160°) at 4 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: 4 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 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the first 460 nm of the route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the first 80 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 30 to 160 nm out.
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 route from 599 to 749 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 889 to 1728 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1319 to 1349 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1359 to 1868 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1449 to 1748 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 1538 to 1728 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 190 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 IAD.

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

B738 at 1,700 ft, 5 nm north, 2:20 am EDT (06:20 UTC): overcast from 1,700 ft to 2,000 ft, remarks: during the descent. 330 nm along the route, 5 nm north of the line.
as filed, and in English
```
TOL UA /OV KTOL/TM 0620/FL017/TP B738/SK OVC017-TOP020/RM DURD
```
Report
a routine report filed through TOL
Where
over KTOL
Time
06:20 UTC
Height
at 1,700 ft
Aircraft
B738
Sky
overcast from 1,700 ft, tops 2,000 ft
Remarks
during the descent
A333 descending, 47 nm northeast, 1:44 am EDT (05:44 UTC): a routine report with nothing remarked on. 330 nm along the route, 47 nm northeast of the line.
as filed, and in English
```
DTW UA /OV DTW/TM 0544/FLDURD/TP A333/SK TOPS 025
```
Report
a routine report filed through DTW
Where
over DTW
Time
05:44 UTC
Height
during the descent
Aircraft
A333
Sky
tops 2,500 ft
B738 at 1,800 ft, 5 nm north, 1:18 am EDT (05:18 UTC): overcast from 1,800 ft to 2,700 ft, remarks: during the climb. 330 nm along the route, 5 nm north of the line.
as filed, and in English
```
TOL UA /OV KTOL/TM 0518/FL018/TP B738/SK OVC018-TOP027/RM DURC
```
Report
a routine report filed through TOL
Where
over KTOL
Time
05:18 UTC
Height
at 1,800 ft
Aircraft
B738
Sky
overcast from 1,800 ft, tops 2,700 ft
Remarks
during the climb
B739 descending, 47 nm northeast, 12:54 am EDT (04:54 UTC): a routine report with nothing remarked on. 330 nm along the route, 47 nm northeast of the line.
as filed, and in English
```
DTW UA /OV DTW/TM 0454/FLDURD/TP B739/SK BASES 011
```
Report
a routine report filed through DTW
Where
over DTW
Time
04:54 UTC
Height
during the descent
Aircraft
B739
Sky
bases 1,100 ft
B738 at 1,300 ft, 5 nm north, 12:45 am EDT (04:45 UTC): overcast from 1,300 ft to 3,000 ft, remarks: during the descent. 330 nm along the route, 5 nm north of the line.
as filed, and in English
```
TOL UA /OV KTOL/TM 0445/FL013/TP B738/SK OVC013-TOP030/RM DURD
```
Report
a routine report filed through TOL
Where
over KTOL
Time
04:45 UTC
Height
at 1,300 ft
Aircraft
B738
Sky
overcast from 1,300 ft, tops 3,000 ft
Remarks
during the descent
LJ45 at 10,000 ft, 46 nm southwest, 12:31 am EDT (04:31 UTC): no turbulence, clear, remarks: ground fog at fwa FV10SM on final runway 14. 390 nm along the route, 46 nm southwest of the line.
as filed, and in English
```
FWA UA /OV OLK/TM 0431/FL100/TP LJ45/SK CLR/TB SMOOTH/RM GROUND FOG AT FWA. FV10SM ON FINAL RY 14
```
Report
a routine report filed through FWA
Where
over OLK
Time
04:31 UTC
Height
at 10,000 ft
Aircraft
LJ45
Sky
clear
Turbulence
smooth
Remarks
ground fog at fwa FV10SM on final runway 14

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 18 forecast points nearest it (EKN, AGC, CLE, FWA, MKG, GRB, LSE, MSP, AXN, ABR, DIK, MLS, BIL, 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	220° at 2 kt	+1 kt	3 °C	119 kt	16 h 47 min	4:54 pm PDT (23:54 UTC)
6,500 ft	260° at 3 kt	+2 kt	9 °C	118 kt	16 h 56 min	5:03 pm PDT (00:03 UTC)
8,500 ft	260° at 4 kt	+4 kt	6 °C	116 kt	17 h 13 min	5:20 pm PDT (00:20 UTC)
10,500 ft	250° at 7 kt	+6 kt	2 °C	114 kt	17 h 32 min	5:39 pm PDT (00:39 UTC)
12,500 ft	240° at 10 kt	+8 kt	-1 °C	112 kt	17 h 50 min	5:57 pm PDT (00:57 UTC)
14,500 ft	250° at 13 kt	+11 kt	-5 °C	109 kt	18 h 20 min	6:27 pm PDT (01:27 UTC)
16,500 ft	260° at 16 kt	+15 kt	-9 °C	105 kt	19 h 02 min	7:09 pm PDT (02:09 UTC)
18,000 ft FL180	260° at 18 kt	+17 kt	-12 °C	103 kt	19 h 24 min	7:31 pm PDT (02:31 UTC)
24,000 ft FL240	260° at 20 kt	+20 kt	-23 °C	100 kt	19 h 59 min	8:06 pm PDT (03:06 UTC)
30,000 ft FL300	270° at 23 kt	+24 kt	-37 °C	96 kt	20 h 49 min	8:56 pm PDT (03:56 UTC)
34,000 ft FL340	270° at 34 kt	+35 kt	-42 °C	85 kt	23 h 30 min	11:37 pm PDT (06:37 UTC)
39,000 ft FL390	270° at 43 kt	+44 kt	-48 °C	76 kt	26 h 17 min	2:24 am PDT (09:24 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
EKN	used from 0 nm out; 91 nm from the line		330/21 12°	330/25 7°	350/22 2°	330/24 -10°	310/27 -21°	320/33 -35°	290/31 -39°	290/34 -47°
AGC	used from 100 nm out; 24 nm from the line	350/14	330/20 11°	340/18 8°	330/17 3°	340/22 -11°	340/31 -22°	330/33 -36°	300/34 -41°	300/35 -47°
CLE	used from 200 nm out; 41 nm from the line	340/7	010/16 13°	350/18 8°	350/20 3°	340/31 -10°	340/46 -21°	340/54 -37°	330/62 -44°	340/65 -49°
FWA	used from 300 nm out; 73 nm from the line	300/17	320/20 16°	330/20 10°	340/15 3°	310/27 -8°	320/37 -20°	330/52 -36°	330/65 -43°	330/60 -50°
MKG	used from 400 nm out; 63 nm from the line	260/22	290/16 15°	300/11 10°	290/5 3°	300/26 -9°	300/32 -20°	320/48 -36°	320/61 -45°	310/74 -53°
GRB	used from 549 nm out; 85 nm from the line	250/36	270/23 16°	270/14 9°	240/18 4°	280/26 -9°	280/29 -20°	290/42 -36°	290/51 -45°	290/72 -55°
LSE	used from 599 nm out; 63 nm from the line	230/40	240/24 17°	240/13 10°	250/13 6°	280/22 -9°	250/28 -21°	250/41 -34°	260/42 -44°	270/62 -53°
MSP	used from 749 nm out; 32 nm from the line	230/26	240/30 17°	240/24 12°	250/22 5°	250/35 -10°	260/36 -21°	250/41 -36°	250/49 -45°	260/58 -52°
AXN	used from 849 nm out; 59 nm from the line	100/14	250/21 14°	240/24 12°	240/31 5°	260/36 -10°	260/40 -21°	250/42 -36°	260/48 -45°	260/53 -50°
ABR	used from 949 nm out; 33 nm from the line	070/14	250/10 17°	270/16 11°	260/28 5°	260/36 -10°	260/41 -22°	270/33 -37°	260/42 -42°	260/50 -48°
DIK	used from 1099 nm out; 85 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°
MLS	used from 1249 nm out; 53 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°
BIL	used from 1399 nm out; 71 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°
GTF	used from 1449 nm out; 83 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°
GPI	used from 1648 nm out; 53 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°
GEG	used from 1748 nm out; 32 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 1898 nm out; 59 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 1948 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°

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
IAD Washington, DC	departure	IFR Sky: a broken layer at 900 feet, overcast at 2,000 feet Weather: light rain, mist	from the north-northwest (340°) at 11 knots	4 mi	900 ft	312 ft	2:52 am EDT (06:52 UTC)
HLG Wheeling, WV	160 nm out, 8 nm southwest of the line, tower	IFR Sky: a broken layer at 600 feet, overcast at 1,100 feet	from the west-northwest (300°) at 5 knots	10+ mi	600 ft	1,194 ft	06:53 UTC
TOL Toledo, OH	330 nm out, 5 nm north of the line, tower	marginal VFR Sky: overcast at 1,300 feet	from the west-southwest (240°) at 3 knots	10+ mi	1,300 ft	683 ft	06:52 UTC
MKE Milwaukee, WI	529 nm out, 4 nm north of the line, tower	VFR Sky: overcast at 25,000 feet	from the southwest (220°) at 10 knots	10+ mi	25,000 ft	728 ft	06:52 UTC
LSE La Crosse, WI	689 nm out, 3 nm east of the line, tower	VFR	from the south (190°) at 11 knots	10+ mi	none	655 ft	06:53 UTC
MVE Montevideo, MN	889 nm out, 1 nm northeast of the line	low IFR Sky: overcast at 400 feet	from the northwest (310°) at 7 knots	7 mi	400 ft	1,034 ft	06:55 UTC
ABR Aberdeen, SD	1009 nm out, 5 nm south of the line	low IFR Sky: overcast at 300 feet Weather: mist	from the north-northeast (030°) at 8 knots	3 mi	300 ft	1,301 ft	06:53 UTC
BHK Baker, MT	1259 nm out, 9 nm south of the line	low IFR Sky: overcast at 400 feet Weather: mist	from the east (090°) at 9 knots	2.5 mi	400 ft	2,980 ft	06:59 UTC
GTF Great Falls, MT	1558 nm out, 14 nm north of the line, tower	marginal VFR Sky: a few clouds at 300 feet, overcast at 1,200 feet Weather: light snow, mist	from the north-northwest (340°) at 8 knots	5 mi	1,200 ft	3,680 ft	06:53 UTC
SFF Spokane, WA	1798 nm out, 9 nm north of the line, tower	VFR Sky: a few clouds at 9,000 feet, a broken layer at 11,000 feet	calm	10+ mi	11,000 ft	1,956 ft	06:53 UTC
GEG Spokane, WA	1808 nm out, 6 nm northeast of the line, tower	VFR Sky: a few clouds at 7,000 feet, a broken layer at 10,000 feet	from the north-northeast (030°) at 8 knots	10+ mi	10,000 ft	2,385 ft	06:53 UTC
BFI Seattle, WA	destination	VFR	from the south-southeast (160°) at 4 knots	10+ mi	none	21 ft	11:53 pm PDT (06:53 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 BFI when you get there the forecast at the estimated arrival, 4:54 pm PDT (23:54 UTC)

Wind from the west at 5 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for BFI

From Sun 11:00 pm PDT (06:00 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
From Mon 7:00 pm PDT (02:00 UTC): wind calm, visibility more than 6 miles, clear skies

The forecast for IAD, the departure

From Mon 2:00 am EDT (06:00 UTC): wind from the north-northwest at 12 knots, visibility 5 miles, light rain, mist, overcast at 600 feet
From Mon 8:00 am EDT (12:00 UTC): wind from the north-northwest at 10 knots, gusting to 18, visibility more than 6 miles, overcast at 1,000 feet
From Mon 12:00 pm EDT (16:00 UTC): wind from the north-northwest at 13 knots, gusting to 21, visibility more than 6 miles, scattered clouds at 1,500 feet, overcast at 2,500 feet
From Mon 2:00 pm EDT (18:00 UTC): wind from the north-northwest at 11 knots, gusting to 18, visibility more than 6 miles, scattered clouds at 2,500 feet, overcast at 3,500 feet
From Mon 5:00 pm EDT (21:00 UTC): wind from the northwest at 7 knots, visibility more than 6 miles, a broken layer at 3,500 feet
From Mon 8:00 pm EDT (00:00 UTC): wind from the west-northwest at 3 knots, visibility more than 6 miles, scattered clouds at 4,000 feet

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

4/9383 WASHINGTON, DC., USA 8 nm from the route, at the departure end · security · ZDC
6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 4 nm from the route, at the departure end · a VIP movement · today · ZDC
6/8829 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 14 nm from the route, 190 nm along the route · a VIP movement · today · ZOB
6/8587 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 14 nm from the route, 190 nm along the route · a VIP movement · today · ZOB

Daylight

Sunset at IAD 6:36 pm EDT (22:36 UTC), at BFI 6:25 pm PDT (01:25 UTC) (civil twilight ends 6:56 pm PDT (01:56 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 Northeast · loop National Weather Service

Radar now, the central Great Lakes · 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: Washington Dulles International, Boeing Fld/King County International.