Plan a flight · Mon 1:09 am PDT (08:09 UTC)

Boeing Fld/King County International to Raleigh-Durham International BFI → RDU

2,041 nautical miles (2,349 statute miles) east on a straight line, true course 094°, about 079° magnetic at the departure end (variation 15E). At 120 knots that is 12 h 50 min at the quickest height in today's winds (39,000 ft, a 39-knot tailwind), arriving about 4:59 pm EDT (20:59 UTC). Right now BFI is VFR, wind calm; RDU is VFR, wind from the west-southwest (240°) 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: 2 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 route from 30 to 408 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 159 to 558 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 249 to 558 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 279 to 1006 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 568 to 757 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 697 to 787 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Near the route, 737 nm along the route.
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 1115 to 1414 nm out.
AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist, fog). Over the route from 1653 to 1932 nm out.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1812 to 1952 nm out.
AIRMET TANGO 5W: moderate turbulence below 18,000 ft (due to mountain wave) up to 10,000 ft. Over the last 139 nm of the route.
AIRMET TANGO 5W: moderate turbulence above 18,000 ft (due to mountain wave) from 29,000 ft to 40,000 ft. Near the route, at the destination end.

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

E73L descending, 40 nm south, 11:20 pm PDT (06:20 UTC): remarks: breaking action good broke out about 600FT above ground. 468 nm along the route, 40 nm south of the line.
as filed, and in English
```
BZN UA /OV BZN/TM 0620/FLDURD/TP E73L/RM BREAKING ACTION GOOD. BROKE OUT ABOUT 600FT AGL
```
Report
a routine report filed through BZN
Where
over BZN
Time
06:20 UTC
Height
during the descent
Aircraft
E73L
Remarks
breaking action good broke out about 600FT above ground
B737 , 40 nm south, 10:31 pm PDT (05:31 UTC): remarks: saw the light at 500FT braking good no icing. 468 nm along the route, 40 nm south of the line.
as filed, and in English
```
BZN UA /OV BZN/TM 0531/FLBURD/TP B737/RM SAW THE LIGHT AT 500FT. BRAKING GOOD. NEG ICING
```
Report
a routine report filed through BZN
Where
over BZN
Time
05:31 UTC
Height
at BURD
Aircraft
B737
Remarks
saw the light at 500FT braking good no icing
B739 at 35,000 ft, 37 nm northeast, 12:05 am PDT (07:05 UTC): no turbulence. 1514 nm along the route, 37 nm northeast of the line.
as filed, and in English
```
TIP UA /OV RBS010023/TM 0705/FL350/TP B739/TB NEG
```
Report
a routine report filed through TIP
Where
23 nm north (010°) of RBS
Time
07:05 UTC
Height
at 35,000 ft
Aircraft
B739
Turbulence
none
B752 climbing, 9 nm north, 12:37 am PDT (07:37 UTC): overcast. 1703 nm along the route, 9 nm north of the line.
as filed, and in English
```
CVG UA /OV 5 W CVG/TM 0737/FLDURC/TP B752/SK B001 OVC T015
```
Report
a routine report filed through CVG
Where
5 west cvg
Time
07:37 UTC
Height
during the climb
Aircraft
B752
Sky
B001 overcast T015

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 21 forecast points nearest it (SEA, YKM, GEG, LWS, GPI, GTF, BIL, MLS, RAP, PIR, FSD, MCW, DSM, BRL, SPI, JOT, IND, CVG, CRW, ROA, RDU). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
3,500 ft	270° at 12 kt	−11 kt		131 kt	15 h 35 min	7:44 pm EDT (23:44 UTC)
5,500 ft	260° at 5 kt	−4 kt	8 °C	124 kt	16 h 28 min	8:37 pm EDT (00:37 UTC)
7,500 ft	280° at 5 kt	−5 kt	9 °C	125 kt	16 h 20 min	8:29 pm EDT (00:29 UTC)
9,500 ft	270° at 6 kt	−6 kt	4 °C	126 kt	16 h 12 min	8:21 pm EDT (00:21 UTC)
11,500 ft	250° at 8 kt	−7 kt	1 °C	127 kt	16 h 04 min	8:13 pm EDT (00:13 UTC)
13,500 ft	250° at 10 kt	−9 kt	-2 °C	129 kt	15 h 49 min	7:58 pm EDT (23:58 UTC)
15,500 ft	260° at 13 kt	−11 kt	-6 °C	131 kt	15 h 35 min	7:44 pm EDT (23:44 UTC)
17,500 ft	260° at 16 kt	−14 kt	-10 °C	134 kt	15 h 14 min	7:23 pm EDT (23:23 UTC)
18,000 ft FL180	260° at 16 kt	−15 kt	-11 °C	135 kt	15 h 07 min	7:16 pm EDT (23:16 UTC)
24,000 ft FL240	270° at 19 kt	−18 kt	-22 °C	138 kt	14 h 47 min	6:56 pm EDT (22:56 UTC)
30,000 ft FL300	260° at 24 kt	−22 kt	-35 °C	142 kt	14 h 22 min	6:31 pm EDT (22:31 UTC)
34,000 ft FL340	270° at 38 kt	−36 kt	-40 °C	156 kt	13 h 05 min	5:14 pm EDT (21:14 UTC)
39,000 ft FL390	260° at 42 kt	−39 kt	-47 °C	159 kt	12 h 50 min	4:59 pm EDT (20:59 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; 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°
YKM	used from 50 nm out; 52 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 149 nm out; 30 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°
LWS	used from 249 nm out; 70 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°
GPI	used from 299 nm out; 85 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 349 nm out; 88 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°
BIL	used from 498 nm out; 54 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°
MLS	used from 647 nm out; 50 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°
RAP	used from 747 nm out; 77 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°
PIR	used from 846 nm out; 64 nm from the line		170/22 19°	190/25 13°	210/32 6°	240/23 -9°	250/32 -21°	250/38 -36°	260/44 -40°	260/52 -47°
FSD	used from 996 nm out; 76 nm from the line	190/9	230/30 18°	240/23 13°	240/20 6°	260/22 -9°	250/31 -21°	250/43 -36°	260/49 -43°	270/53 -47°
MCW	used from 1195 nm out; 56 nm from the line	220/44	250/30 17°	230/14 12°	240/17 6°	250/22 -8°	270/29 -20°	250/34 -34°	260/52 -43°	260/59 -51°
DSM	used from 1245 nm out; 43 nm from the line	230/40	250/33 17°	250/18 12°	240/17 5°	260/28 -8°	270/34 -19°	260/41 -33°	260/55 -41°	270/62 -51°
BRL	used from 1344 nm out; 42 nm from the line	230/24	240/29 15°	290/16 10°	280/15 4°	260/23 -7°	260/32 -19°	260/36 -33°	280/48 -41°	280/59 -52°
SPI	used from 1444 nm out; 57 nm from the line	220/21	250/23 16°	260/27 9°	270/14 6°	270/23 -7°	270/31 -19°	270/28 -33°	290/48 -42°	300/55 -52°
JOT	used from 1494 nm out; 70 nm from the line	250/23	270/22 15°	250/16 10°	240/9 4°	280/22 -7°	280/29 -19°	300/29 -34°	290/50 -43°	300/64 -52°
IND	used from 1543 nm out; 50 nm from the line	290/16	310/20 16°	320/21 10°	330/13 3°	300/25 -7°	320/32 -19°	330/46 -34°	320/61 -43°	320/63 -50°
CVG	used from 1643 nm out; 37 nm from the line	320/18	350/32 16°	350/35 10°	350/30 3°	330/30 -7°	340/44 -20°	340/58 -35°	330/72 -41°	320/36 -49°
CRW	used from 1792 nm out; 61 nm from the line	330/20	330/23 11°	340/25 8°	340/21 2°	340/33 -9°	340/41 -20°	330/42 -35°	320/44 -39°	320/43 -47°
ROA	used from 1892 nm out; 50 nm from the line	310/29	330/31 13°	340/28 7°	330/25 3°	310/32 -8°	300/32 -22°	290/32 -31°	270/35 -38°	270/32 -47°
RDU	used from 1992 nm out; 25 nm from the line	280/33	300/23 11°	300/28 8°	290/28 4°	260/41 -6°	240/52 -18°	230/66 -31°	230/76 -39°	240/52 -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	calm	10+ mi	none	21 ft	12:53 am PDT (07:53 UTC)
MWH Moses Lake, WA	119 nm out, 9 nm south of the line, tower	VFR	from the north (350°) at 6 knots	10+ mi	none	1,188 ft	07:52 UTC
MSO Missoula, MT	339 nm out, 4 nm north of the line, tower	VFR Sky: a few clouds at 3,600 feet, overcast at 8,000 feet	from the west-southwest (250°) at 5 knots	8 mi	8,000 ft	3,205 ft	08:02 UTC
HLN Helena, MT	428 nm out, 3 nm northwest of the line, tower	marginal VFR Sky: a few clouds at 1,900 feet, overcast at 4,800 feet Weather: light snow, mist	from the west (270°) at 9 knots	4 mi	4,800 ft	3,877 ft	07:53 UTC
EFC Belle Fourche, SD	787 nm out, 23 nm southwest of the line	no report just now				3,190 ft
PIR Pierre, SD	936 nm out, 6 nm north of the line	low IFR Sky: overcast at 400 feet Weather: light rain, mist	from the northeast (050°) at 8 knots	2 mi	400 ft	1,744 ft	07:53 UTC
FSD Sioux Falls, SD	1095 nm out, 16 nm north of the line, tower	VFR	from the north-northeast (020°) at 4 knots	10+ mi	none	1,430 ft	07:56 UTC
MLI Moline, IL	1394 nm out, 14 nm northeast of the line, tower	VFR	from the south-southwest (200°) at 9 knots	10+ mi	none	589 ft	07:52 UTC
BMI Bloomington/Normal, IL	1494 nm out, 8 nm southwest of the line, tower	VFR	from the south-southwest (200°) at 7 knots	10+ mi	none	871 ft	07:56 UTC
BAK Columbus, IN	1643 nm out, 6 nm south of the line, tower	VFR	calm	10+ mi	none	656 ft	01:45 UTC
GSO Greensboro, NC	1992 nm out, 20 nm southwest of the line, tower	VFR Sky: a few clouds at 3,800 feet	from the west-southwest (250°) at 7 knots	10+ mi	none	925 ft	07:54 UTC
RDU Raleigh/Durham, NC	destination	VFR Sky: a few clouds at 3,500 feet, a few clouds at 7,000 feet	from the west-southwest (240°) at 7 knots	10+ mi	none	435 ft	3:51 am EDT (07:51 UTC)

The highest airport on this list sits at 3,877 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At RDU when you get there the forecast at the estimated arrival, 4:59 pm EDT (20:59 UTC)

Wind from the northwest at 11 knots, gusting to 19, visibility more than 6 miles, scattered clouds at 3,000 feet, a broken layer at 4,500 feet VFR

The whole forecast for RDU

From Mon 2:00 am EDT (06:00 UTC): wind from the west-southwest at 10 knots, visibility more than 6 miles, a few clouds at 2,500 feet, a broken layer at 4,000 feet and more above
From Mon 10:00 am EDT (14:00 UTC): wind from the northwest at 11 knots, gusting to 19, visibility more than 6 miles, scattered clouds at 3,000 feet, a broken layer at 4,500 feet
At times between Mon 10:00 am EDT (14:00 UTC) and 1:00 pm EDT (17:00 UTC): wind from the northwest at 12 knots, gusting to 22, a broken layer at 3,000 feet
From Mon 5:30 pm EDT (21:30 UTC): wind from the northwest at 3 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

The forecast for BFI, the departure

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

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

6/8029 Cincinnati, OH, Friday, October 9, 2026 through Monday, October 12, 2026 Local 8 nm from the route, 1703 nm along the route · a VIP movement · until 12 October · ZID

Daylight

Sunset at BFI 6:25 pm PDT (01:25 UTC), at RDU 6:43 pm EDT (22:43 UTC) (civil twilight ends 7:09 pm EDT (23:09 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, Raleigh-Durham International.