Plan a flight · Sun 8:29 pm PDT (03:29 UTC)

Seattle-Tacoma International to Wilmington Air Park Airport SEA → ILN

1,727 nautical miles (1,988 statute miles) east on a straight line, true course 092°, about 076° magnetic at the departure end (variation 16E). At 120 knots that is 10 h 40 min at the quickest height in today's winds (39,000 ft, a 42-knot tailwind), arriving about 10:09 am EDT (14:09 UTC). Right now SEA is VFR, wind from the north-northeast (030°) at 8 knots; ILN is marginal VFR, wind from the west-northwest (290°) 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: 221 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 729 to 799 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.

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 499 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 230 to 559 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 250 to 459 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 260 to 929 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 1018 to 1048 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 1208 to 1278 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 110 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 SEA.

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

A321 at 13,500 ft, 34 nm south, 6:54 pm PDT (01:54 UTC): remarks: zse. At the departure end, 34 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, 34 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 34 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, 34 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 34 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, 26 nm north, 6:52 pm PDT (01:52 UTC): remarks: zse. At the departure end, 26 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, 39 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, 39 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, 4 nm southwest, 8:16 pm PDT (03:16 UTC): no icing, overcast above 4,200 ft, remarks: during the descent ils runway 12. 339 nm along the route, 4 nm southwest 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, 4 nm southwest, 6:47 pm PDT (01:47 UTC): snow, rain, remarks: during the descent ils runway 12. 339 nm along the route, 4 nm southwest 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, 4 nm southwest, 5:36 pm PDT (00:36 UTC): no icing, overcast above 4,100 ft, remarks: during the descent ils runway 12. 339 nm along the route, 4 nm southwest 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
A306 at 4,700 ft, 30 nm south, 5:51 pm PDT (00:51 UTC): a routine report with nothing remarked on. 569 nm along the route, 30 nm south of the line.
as filed, and in English
```
BIL UA /OV BIL280001/TM 0051/FL047/TP A306/SK BASE 047
```
Report
a routine report filed through BIL
Where
1 nm west (280°) of BIL
Time
00:51 UTC
Height
at 4,700 ft
Aircraft
A306
Sky
base 4,700 ft
UAL2499 at 28,000 ft, 40 nm southwest, 7:15 pm PDT (02:15 UTC): light chop turbulence. 1348 nm along the route, 40 nm southwest of the line.
as filed, and in English
```
ARP UAL2499 4138N 09137W 0215 F280 TB INTMT LGT CHOP IC
```
Report
a routine report filed through ARP
A321 at 32,000 ft, 17 nm north, 6:56 pm PDT (01:56 UTC): light turbulence, remarks: pocket continuous light turbulence. 1428 nm along the route, 17 nm north of the line.
as filed, and in English
```
RPJ UA /OV PLL/TM 0156/FL320/TP A321/TB CONS LGT/RM POCKET CONS LGT TB
```
Report
a routine report filed through RPJ
Where
over PLL
Time
01:56 UTC
Height
at 32,000 ft
Aircraft
A321
Turbulence
continuous light
Remarks
pocket continuous light turbulence
CRJ9 descending, 15 nm northeast, 6:15 pm PDT (01:15 UTC): a routine report with nothing remarked on. At the destination end, 15 nm northeast of the line.
as filed, and in English
```
DAY UA /OV DAY/TM 0115/FLDURD/TP CRJ9/SK T031 B005
```
Report
a routine report filed through DAY
Where
over DAY
Time
01:15 UTC
Height
during the descent
Aircraft
CRJ9
Sky
T031 B005

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, LWS, GPI, GTF, BIL, MLS, DIK, RAP, PIR, ABR, FSD, MCW, DBQ, JOT, IND, CVG). 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	240° at 13 kt	−8 kt		128 kt	13 h 30 min	12:59 pm EDT (16:59 UTC)
5,500 ft	210° at 5 kt	−1 kt	7 °C	121 kt	14 h 16 min	1:45 pm EDT (17:45 UTC)
7,500 ft	230° at 5 kt	−2 kt	8 °C	122 kt	14 h 09 min	1:38 pm EDT (17:38 UTC)
9,500 ft	230° at 6 kt	−3 kt	4 °C	123 kt	14 h 02 min	1:31 pm EDT (17:31 UTC)
11,500 ft	220° at 10 kt	−4 kt	1 °C	124 kt	13 h 56 min	1:25 pm EDT (17:25 UTC)
13,500 ft	230° at 12 kt	−7 kt	-3 °C	127 kt	13 h 36 min	1:05 pm EDT (17:05 UTC)
15,500 ft	240° at 14 kt	−10 kt	-7 °C	130 kt	13 h 17 min	12:46 pm EDT (16:46 UTC)
17,500 ft	240° at 17 kt	−12 kt	-10 °C	132 kt	13 h 05 min	12:34 pm EDT (16:34 UTC)
18,000 ft FL180	240° at 17 kt	−13 kt	-11 °C	133 kt	12 h 59 min	12:28 pm EDT (16:28 UTC)
24,000 ft FL240	250° at 18 kt	−15 kt	-22 °C	135 kt	12 h 48 min	12:17 pm EDT (16:17 UTC)
30,000 ft FL300	250° at 24 kt	−20 kt	-36 °C	140 kt	12 h 20 min	11:49 am EDT (15:49 UTC)
34,000 ft FL340	260° at 37 kt	−35 kt	-41 °C	155 kt	11 h 09 min	10:38 am EDT (14:38 UTC)
39,000 ft FL390	260° at 45 kt	−42 kt	-47 °C	162 kt	10 h 40 min	10:09 am EDT (14:09 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; 50 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 150 nm out; 29 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 250 nm out; 73 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 300 nm out; 79 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; 82 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 499 nm out; 58 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 649 nm out; 32 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; 88 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°
RAP	used from 799 nm out; 76 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 849 nm out; 65 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°
ABR	used from 999 nm out; 72 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°
FSD	used from 1048 nm out; 28 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 1148 nm out; 71 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°
DBQ	used from 1298 nm out; 48 nm from the line	230/33	250/30 16°	280/15 9°	260/15 5°	260/21 -7°	260/24 -20°	250/37 -33°	270/42 -43°	280/63 -52°
JOT	used from 1448 nm out; 27 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 1548 nm out; 59 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 1648 nm out; 50 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°

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
SEA Seattle, WA	departure	VFR Sky: a few clouds at 3,000 feet	from the north-northeast (030°) at 8 knots	10+ mi	none	432 ft	7:53 pm PDT (02:53 UTC)
MWH Moses Lake, WA	120 nm out, 9 nm south 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
MSO Missoula, MT	339 nm out, 4 nm southwest of the line, tower	IFR Sky: a few clouds at 500 feet, overcast at 1,700 feet Weather: light snow, mist	calm	1.5 mi	1,700 ft	3,205 ft	03:24 UTC
HLN Helena, MT	429 nm out, 9 nm southwest of the line, tower	IFR Sky: a broken layer at 900 feet, overcast at 1,600 feet Weather: light snow, mist	from the west-northwest (300°) at 7 knots	1.5 mi	900 ft	3,877 ft	03:14 UTC
RPX Roundup, MT	569 nm out, 10 nm north of the line	no report just now				3,490 ft
MKA Miller, SD	989 nm out, 5 nm north of the line	no report just now				1,569 ft
FSD Sioux Falls, SD	1098 nm out, 17 nm southwest of the line, tower	VFR Sky: a few clouds at 18,000 feet, scattered clouds at 25,000 feet	from the northwest (320°) at 4 knots	10+ mi	none	1,430 ft	02:56 UTC
ALO Waterloo, IA	1298 nm out, 5 nm west of the line, tower	VFR	from the south (180°) at 11 knots	10+ mi	none	873 ft	02:54 UTC
IKK Kankakee, IL	1518 nm out, 1 nm north of the line	VFR	from the south (170°) at 3 knots	10+ mi	none	629 ft	03:15 UTC
AID Anderson, IN	1638 nm out, 5 nm west of the line, tower	low IFR Sky: sky obscured at 500 feet Weather: mist	calm	0.75 mi	500 ft	919 ft	03:15 UTC
ILN Wilmington, OH	destination	marginal VFR Sky: overcast at 1,000 feet Weather: mist	from the west-northwest (290°) at 7 knots	6 mi	1,000 ft	1,076 ft	11:21 pm EDT (03:21 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 ILN when you get there the forecast at the estimated arrival, 10:09 am EDT (14:09 UTC)

Wind from the south at 6 knots, visibility more than 6 miles, scattered clouds at 25,000 feet VFR

The whole forecast for ILN

From Sun 8:00 pm EDT (00:00 UTC): wind from the north-northwest at 6 knots, visibility 4 miles, mist, overcast at 600 feet
From Mon 2:00 am EDT (06:00 UTC): wind from the northwest at 6 knots, visibility 4 miles, mist, scattered clouds at 400 feet
From Mon 4:00 am EDT (08:00 UTC): wind from the west-northwest at 5 knots, visibility 1 mile, mist, scattered clouds at 200 feet
At times between Mon 6:00 am EDT (10:00 UTC) and 9:00 am EDT (13:00 UTC): visibility ¼ mile, fog, sky obscured at 200 feet
From Mon 10:00 am EDT (14:00 UTC): wind from the south at 6 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
From Mon 12:00 pm EDT (16:00 UTC): wind from the south-southwest at 10 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

The forecast for SEA, the departure

From Sun 8:00 pm PDT (03:00 UTC): wind from the north at 6 knots, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind from the southeast at 4 knots, 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 4 knots, visibility more than 6 miles, clear skies
From Mon 11:00 am PDT (18:00 UTC): wind from the west at 6 knots, visibility more than 6 miles, clear skies
From Mon 8:00 pm PDT (03:00 UTC): wind from the northwest at 5 knots, 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 SEA 6:27 pm PDT (01:27 UTC), at ILN 7:00 pm EDT (23:00 UTC) (civil twilight ends 7:27 pm EDT (23:27 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, Wilmington Air Park Airport.