Plan a flight · Sun 8:27 pm PDT (03:27 UTC)

Seattle-Tacoma International to Washington Dulles International SEA → IAD

1,999 nautical miles (2,300 statute miles) east on a straight line, true course 088°, about 072° magnetic at the departure end (variation 16E). At 120 knots that is 12 h 11 min at the quickest height in today's winds (39,000 ft, a 44-knot tailwind), arriving about 11:38 am EDT (15:38 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: 3,675 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 1C: thunderstorms (a convective SIGMET) up to 30,000 ft, moving from the southwest at 40 knots, until 9:55 pm PDT (04:55 UTC). Over the route from 759 to 789 nm out.

as issued

WSUS32 KKCI 120255
MKCC WST 120255
CONVECTIVE SIGMET 1C
VALID UNTIL 0455Z
SD ND MT WY
FROM 30WSW DIK-50NW DPR-60WNW RAP-50ENE SHR-30WSW DIK
AREA TS MOV FROM 22040KT. TOPS TO FL300.

SIGMET E11E: thunderstorms (a convective SIGMET) up to 34,000 ft, moving from the southwest at 20 knots, until 9:55 pm PDT (04:55 UTC). Over the last 80 nm of the route.

as issued

WSUS31 KKCI 120255
MKCE WST 120255
CONVECTIVE SIGMET 11E
VALID UNTIL 0455Z
NY NJ PA DE MD VA DC WV AND DE NJ NY MD CT VA CSTL WTRS
FROM 20NE JFK-90SE SIE-20NNW ORF-30ENE EKN-10S JST-20NE JFK
AREA EMBD TS MOV FROM 24020KT. TOPS TO FL340.

AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 160 nm of the route.
AIRMET ZULU 2C: moderate icing up to 20,000 ft. Over the route from 60 to 490 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 240 to 550 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 260 to 460 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 270 to 919 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 999 to 1099 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). Over the last 450 nm of the route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the last 160 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1839 to 1969 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 SEA.

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

A320 at 33,000 ft, 18 nm north, 5:36 pm PDT (00:36 UTC): moderate turbulence above 33,000 ft, remarks: zob. 1599 nm along the route, 18 nm north of the line.
as filed, and in English
```
JXN UA /OV JXN280030/TM 0036/FL330/TP A320/TB OCNL MOD 330/RM ZOB
```
Report
a routine report filed through JXN
Where
30 nm west (280°) of JXN
Time
00:36 UTC
Height
at 33,000 ft
Aircraft
A320
Turbulence
occasional moderate at 33,000 ft
Remarks
zob
B38M at 29,000 ft, 16 nm south, 5:55 pm PDT (00:55 UTC): moderate turbulence above 29,000 ft, remarks: zob. 1859 nm along the route, 16 nm south of the line.
as filed, and in English
```
MPG UA /OV AIR120030/TM 0055/FL290/TP B38M /TB OCNL MOD 290/RM ZOB
```
Report
a routine report filed through MPG
Where
30 nm southeast (120°) of AIR
Time
00:55 UTC
Height
at 29,000 ft
Aircraft
B38M
Turbulence
occasional moderate at 29,000 ft
Remarks
zob
B38M at 20,000 ft, 3 nm southwest, 8:11 pm PDT (03:11 UTC): moderate clear-air turbulence from 20,000 ft to 25,000 ft. At the destination end, 3 nm southwest of the line.
as filed, and in English
```
IAD UA /OV AML300020/TM 0311/FL200/TP B38M/TB MOD CAT 200-250
```
Report
a routine report filed through IAD
Where
20 nm northwest (300°) of AML
Time
03:11 UTC
Height
at 20,000 ft
Aircraft
B38M
Turbulence
moderate clear-air turbulence from 20,000 ft to 25,000 ft
A321 at 13,500 ft, 36 nm south, 6:54 pm PDT (01:54 UTC): remarks: zse. At the departure end, 36 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
PC12 at 15,000 ft, 36 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 36 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
PC12 at 13,000 ft, 36 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 36 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
SB20 at 16,000 ft, 23 nm north, 6:52 pm PDT (01:52 UTC): remarks: zse. At the departure end, 23 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 13,500 ft, 49 nm south, 6:08 pm PDT (01:08 UTC): no turbulence, a trace of icing, overcast from 9,000 ft to 13,500 ft, -10 °C. 140 nm along the route, 49 nm south 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
CL30 at 4,200 ft, 27 nm south, 8:16 pm PDT (03:16 UTC): no icing, overcast above 4,200 ft, remarks: during the descent ils runway 12. 340 nm along the route, 27 nm south of the line.
as filed, and in English
```
MSO UA /OV MSO/TM 0316/FL042/TP CL30/SK OVC042/WX 2 1/2SM/IC NEG/RM DURD ILS RY 12
```
Report
a routine report filed through MSO
Where
over MSO
Time
03:16 UTC
Height
at 4,200 ft
Aircraft
CL30
Sky
overcast from 4,200 ft
Weather
2, 1/2SM
Icing
none
Remarks
during the descent ils runway 12
BCS1 at 3,700 ft, 27 nm south, 6:47 pm PDT (01:47 UTC): snow, rain, remarks: during the descent ils runway 12. 340 nm along the route, 27 nm south of the line.
as filed, and in English
```
MSO UA /OV MSO/TM 0147/FL037/TP BCS1/SK 037/WX SN RA/RM DURD ILS RY 12
```
Report
a routine report filed through MSO
Where
over MSO
Time
01:47 UTC
Height
at 3,700 ft
Aircraft
BCS1
Sky
at 3,700 ft
Weather
snow, rain
Remarks
during the descent ils runway 12
C25B at 4,100 ft, 27 nm south, 5:36 pm PDT (00:36 UTC): no icing, overcast above 4,100 ft, remarks: during the descent ils runway 12. 340 nm along the route, 27 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
E295 at 37,000 ft, 8 nm north, 5:53 pm PDT (00:53 UTC): light chop turbulence. 1449 nm along the route, 8 nm north of the line.
as filed, and in English
```
UES UA /OV BAE/TM 0053/FL370/TP E295/TB OCNL LGT CHOP
```
Report
a routine report filed through UES
Where
over BAE
Time
00:53 UTC
Height
at 37,000 ft
Aircraft
E295
Turbulence
occasional light chop
E170 at 21,000 ft, 38 nm north, 6:07 pm PDT (01:07 UTC): light chop turbulence, remarks: during the climb zob. 1619 nm along the route, 38 nm north of the line.
as filed, and in English
```
LAN UA /OV LAN180020/TM 0107/FL210/TP E170/TB LGHT CHOP/RM DURC ZOB
```
Report
a routine report filed through LAN
Where
20 nm south (180°) of LAN
Time
01:07 UTC
Height
at 21,000 ft
Aircraft
E170
Turbulence
lght chop
Remarks
during the climb zob
PA44 descending, 6 nm north, 7:27 pm PDT (02:27 UTC): a broken layer from 900 ft to 1,500 ft; a broken layer from 2,600 ft to 3,500 ft, fog. 1669 nm along the route, 6 nm north of the line.
as filed, and in English
```
TOL UA /OV TOL/TM 0227/FLDURD/TP PA44/SK BKN009 TOPS015 BKN026 TOPS035/WX FG
```
Report
a routine report filed through TOL
Where
over TOL
Time
02:27 UTC
Height
during the descent
Aircraft
PA44
Sky
BKN009 TOPS015 BKN026 TOPS035
Weather
fog

12 more routine reports are on the map.

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 18 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, BIL, MLS, DIK, ABR, AXN, MSP, LSE, GRB, MKG, FWA, CLE, AGC, EKN). 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	260° at 9 kt	−8 kt		128 kt	15 h 37 min	3:04 pm EDT (19:04 UTC)
5,500 ft	250° at 2 kt	−2 kt	3 °C	122 kt	16 h 23 min	3:50 pm EDT (19:50 UTC)
7,500 ft	260° at 4 kt	−3 kt	8 °C	123 kt	16 h 15 min	3:42 pm EDT (19:42 UTC)
9,500 ft	250° at 6 kt	−5 kt	4 °C	125 kt	16 h	3:27 pm EDT (19:27 UTC)
11,500 ft	240° at 9 kt	−8 kt	1 °C	128 kt	15 h 37 min	3:04 pm EDT (19:04 UTC)
13,500 ft	250° at 12 kt	−11 kt	-3 °C	131 kt	15 h 16 min	2:43 pm EDT (18:43 UTC)
15,500 ft	250° at 15 kt	−14 kt	-7 °C	134 kt	14 h 55 min	2:22 pm EDT (18:22 UTC)
17,500 ft	260° at 18 kt	−17 kt	-11 °C	137 kt	14 h 35 min	2:02 pm EDT (18:02 UTC)
18,000 ft FL180	260° at 19 kt	−18 kt	-12 °C	138 kt	14 h 29 min	1:56 pm EDT (17:56 UTC)
24,000 ft FL240	260° at 21 kt	−20 kt	-23 °C	140 kt	14 h 17 min	1:44 pm EDT (17:44 UTC)
30,000 ft FL300	270° at 24 kt	−24 kt	-36 °C	144 kt	13 h 53 min	1:20 pm EDT (17:20 UTC)
34,000 ft FL340	270° at 35 kt	−35 kt	-42 °C	155 kt	12 h 54 min	12:21 pm EDT (16:21 UTC)
39,000 ft FL390	270° at 43 kt	−44 kt	-48 °C	164 kt	12 h 11 min	11:38 am EDT (15:38 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; 55 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 100 nm out; 69 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°
GPI	used from 250 nm out; 75 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 350 nm out; 71 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 500 nm out; 82 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 600 nm out; 52 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°
DIK	used from 749 nm out; 39 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°
ABR	used from 899 nm out; 67 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°
AXN	used from 1049 nm out; 67 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°
MSP	used from 1149 nm out; 49 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°
LSE	used from 1249 nm out; 38 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°
GRB	used from 1399 nm out; 87 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°
MKG	used from 1449 nm out; 73 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°
FWA	used from 1599 nm out; 54 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°
CLE	used from 1699 nm out; 44 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°
AGC	used from 1799 nm out; 39 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°
EKN	used from 1899 nm out; 61 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°

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
SEA Seattle, WA	departure	no report just now	432 ft
GEG Spokane, WA	190 nm out, 10 nm northeast of the line, tower	no report just now	2,385 ft
SFF Spokane, WA	200 nm out, 14 nm north of the line, tower	no report just now	1,956 ft
GTF Great Falls, MT	440 nm out, 18 nm north of the line, tower	no report just now	3,680 ft
BHK Baker, MT	739 nm out, 6 nm south of the line	no report just now	2,980 ft
ABR Aberdeen, SD	989 nm out, 3 nm southeast of the line	no report just now	1,301 ft
OVL Olivia, MN	1139 nm out, 2 nm east of the line	no report just now	1,079 ft
LSE La Crosse, WI	1309 nm out, 4 nm northeast of the line, tower	no report just now	655 ft
MKE Milwaukee, WI	1469 nm out, 6 nm north of the line, tower	no report just now	728 ft
TOL Toledo, OH	1669 nm out, 6 nm north of the line, tower	no report just now	683 ft
HLG Wheeling, WV	1839 nm out, 8 nm southwest of the line, tower	no report just now	1,194 ft
IAD Washington, DC	destination	no report just now	312 ft

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 IAD when you get there the forecast at the estimated arrival, 11:38 am EDT (15:38 UTC)

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

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

6/8829 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 14 nm from the route, 1809 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, 1809 nm along the route · a VIP movement · today · ZOB
4/9383 WASHINGTON, DC., USA 8 nm from the route, at the destination end · security · ZDC
6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 4 nm from the route, at the destination end · a VIP movement · today · ZDC

Daylight

Sunset at SEA 6:27 pm PDT (01:27 UTC), at IAD 6:36 pm EDT (22:36 UTC) (civil twilight ends 7:02 pm EDT (23:02 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: Seattle-Tacoma International, Washington Dulles International.