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

Seattle-Tacoma International to Jackson Hole Airport SEA → JAC

538 nautical miles (619 statute miles) east on a straight line, true course 111°, about 095° magnetic at the departure end (variation 16E). At 120 knots that is 4 h 06 min at the quickest height in today's winds (39,000 ft, a 11-knot tailwind), arriving about 1:35 am MDT (07:35 UTC), after sunset at the destination. Right now SEA is VFR, wind from the north-northeast (030°) at 8 knots; JAC is VFR, wind from the south-southeast (160°) at 10 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: 401 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 first 149 nm of the route.
AIRMET ZULU 2C: moderate icing up to 20,000 ft. Over the route from 60 to 339 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 339 nm of the route.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 259 to 438 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the last 189 nm of the route.
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 last 149 nm of the route.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 30 nm of the route.
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 last 0 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

S22T at 15,000 ft, 41 nm northeast, 6:47 pm PDT (01:47 UTC): moderate rime icing above 15,000 ft, -5 °C. At the destination end, 41 nm northeast of the line.
as filed, and in English
```
JAC UA /OV DNW010020/TM 0147/FL150/TP S22T/TA M05/IC MOD RIME 150 /ZLC
```
Report
a routine report filed through JAC
Where
20 nm north (010°) of DNW
Time
01:47 UTC
Height
at 15,000 ft
Aircraft
S22T
Temperature
−5 °C
Icing
moderate rime at 15,000 ft zlc
SB20 at 16,000 ft, 40 nm northeast, 6:52 pm PDT (01:52 UTC): remarks: zse. 30 nm along the route, 40 nm northeast 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
A321 at 13,500 ft, 22 nm south, 6:54 pm PDT (01:54 UTC): remarks: zse. 40 nm along the route, 22 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 13,000 ft, 22 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. 40 nm along the route, 22 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, 22 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. 40 nm along the route, 22 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
C337 at 12,000 ft, 38 nm southwest, 6:18 pm PDT (01:18 UTC): light rime icing, -12 °C, remarks: zse. 100 nm along the route, 38 nm southwest of the line.
as filed, and in English
```
YKM UA /OV YKM155020/TM 0118/FL120/TP C337/TA M12/IC LGT RIME/RM ZSE
```
Report
a routine report filed through YKM
Where
20 nm southeast (155°) of YKM
Time
01:18 UTC
Height
at 12,000 ft
Aircraft
C337
Temperature
−12 °C
Icing
light rime
Remarks
zse
PC12 at 13,500 ft, 10 nm north, 6:08 pm PDT (01:08 UTC): no turbulence, a trace of icing, overcast from 9,000 ft to 13,500 ft, -10 °C. 149 nm along the route, 10 nm north 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
PC12 at 6,000 ft, 27 nm south, 5:56 pm PDT (00:56 UTC): overcast above 6,000 ft. 179 nm along the route, 27 nm south of the line.
as filed, and in English
```
ALW UA /OV ALW200015/TM 0056/FL060/TP PC12/SK OVC060
```
Report
a routine report filed through ALW
Where
15 nm south (200°) of ALW
Time
00:56 UTC
Height
at 6,000 ft
Aircraft
PC12
Sky
overcast from 6,000 ft
A320 descending, 1 nm north, 5:54 pm PDT (00:54 UTC): overcast above 7,500 ft, remarks: braking action good during the descent runway 19. At the destination end, 1 nm north of the line.
as filed, and in English
```
JAC UA /OV JAC/TM 0054/FLUNKN/TP A320/SK OVC075/RM BRAKING ACTION GOOD DURD RY19
```
Report
a routine report filed through JAC
Where
over JAC
Time
00:54 UTC
Height
height not given
Aircraft
A320
Sky
overcast from 7,500 ft
Remarks
braking action good during the descent runway 19

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 5 forecast points nearest it (SEA, YKM, LWS, DLN, PIH). 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	070° at 10 kt	+7 kt		113 kt	4 h 46 min	2:15 am MDT (08:15 UTC)
5,500 ft	060° at 10 kt	+7 kt		113 kt	4 h 46 min	2:15 am MDT (08:15 UTC)
7,500 ft	050° at 9 kt	+4 kt	-4 °C	116 kt	4 h 38 min	2:07 am MDT (08:07 UTC)
9,500 ft	030° at 9 kt	+1 kt	-6 °C	119 kt	4 h 31 min	2:00 am MDT (08:00 UTC)
11,500 ft	010° at 4 kt	0	-7 °C	120 kt	4 h 29 min	1:58 am MDT (07:58 UTC)
13,500 ft	light and variable	+1 kt	-11 °C	119 kt	4 h 31 min	2:00 am MDT (08:00 UTC)
15,500 ft	180° at 4 kt	+3 kt	-14 °C	117 kt	4 h 36 min	2:05 am MDT (08:05 UTC)
17,500 ft	180° at 8 kt	+5 kt	-17 °C	115 kt	4 h 41 min	2:10 am MDT (08:10 UTC)
18,000 ft FL180	180° at 9 kt	+5 kt	-18 °C	115 kt	4 h 41 min	2:10 am MDT (08:10 UTC)
24,000 ft FL240	180° at 14 kt	+7 kt	-28 °C	113 kt	4 h 46 min	2:15 am MDT (08:15 UTC)
30,000 ft FL300	230° at 18 kt	−6 kt	-35 °C	126 kt	4 h 16 min	1:45 am MDT (07:45 UTC)
34,000 ft FL340	230° at 24 kt	−8 kt	-37 °C	128 kt	4 h 12 min	1:41 am MDT (07:41 UTC)
39,000 ft FL390	230° at 31 kt	−11 kt	-40 °C	131 kt	4 h 06 min	1:35 am MDT (07:35 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; 25 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°
LWS	used from 149 nm out; 57 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°
DLN	used from 349 nm out; 69 nm from the line			090/6 -6°	240/22 -4°	210/34 -16°	210/62 -25°	210/66 -34°	210/82 -36°	220/77 -42°
PIH	used from 498 nm out; 82 nm from the line		L/V	240/13 1°	240/15 -3°	210/42 -15°	200/70 -25°	220/74 -29°	220/71 -36°	220/62 -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
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)
ESW Easton, WA	50 nm out, 7 nm north of the line	no report just now				2,226 ft
YKM Yakima, WA	90 nm out, 22 nm southwest of the line, tower	VFR Sky: overcast at 8,500 feet	calm	10+ mi	8,500 ft	1,098 ft	02:53 UTC
PSC Pasco, WA	149 nm out, 16 nm southwest of the line, tower	VFR Sky: a broken layer at 10,000 feet, overcast at 11,000 feet	from the north-northwest (340°) at 8 knots	10+ mi	10,000 ft	410 ft	02:53 UTC
ALW Walla Walla, WA	179 nm out, 13 nm south of the line, tower	VFR Sky: a broken layer at 6,000 feet, overcast at 7,500 feet	calm	10+ mi	6,000 ft	1,194 ft	02:53 UTC
GIC Grangeville, ID	269 nm out, 18 nm northeast of the line	VFR Sky: overcast at 3,300 feet	from the north-northwest (330°) at 5 knots	10+ mi	3,300 ft	3,313 ft	03:15 UTC
SMN Salmon, ID	379 nm out, 16 nm north of the line	VFR Sky: a few clouds at 600 feet, a broken layer at 4,900 feet, overcast at 8,500 feet	from the north (010°) at 6 knots	10+ mi	4,900 ft	4,044 ft	03:19 UTC
DIJ Driggs, ID	518 nm out, 2 nm southeast of the line	marginal VFR Sky: scattered clouds at 600 feet, overcast at 3,000 feet Weather: light rain	from the northeast (040°) at 6 knots	10+ mi	3,000 ft	6,257 ft	02:56 UTC
JAC Jackson, WY	destination	VFR Sky: overcast at 5,000 feet Weather: light rain	from the south-southeast (160°) at 10 knots	10+ mi	5,000 ft	6,451 ft	8:56 pm MDT (02:56 UTC)

The highest airport on this list sits at 6,451 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At JAC when you get there the forecast at the estimated arrival, 1:35 am MDT (07:35 UTC)

Wind from the north-northeast at 5 knots, visibility more than 6 miles, showers nearby, scattered clouds at 1,500 feet, overcast at 2,500 feet marginal VFR

The whole forecast for JAC

From Sun 6:00 pm MDT (00:00 UTC): wind from the west at 7 knots, visibility 6 miles, light rain showers, scattered clouds at 700 feet, a broken layer at 1,200 feet and more above
At times between Sun 6:00 pm MDT (00:00 UTC) and 9:00 pm MDT (03:00 UTC): visibility 3 miles, rain, a broken layer at 700 feet
From Sun 9:00 pm MDT (03:00 UTC): wind from the north-northeast at 5 knots, visibility more than 6 miles, showers nearby, scattered clouds at 1,500 feet, overcast at 2,500 feet
From Mon 7:00 am MDT (13:00 UTC): wind from the north-northeast at 5 knots, visibility 6 miles, light rain showers, scattered clouds at 1,000 feet, overcast at 1,800 feet
From Mon 3:00 pm MDT (21:00 UTC): wind from the southwest at 4 knots, visibility more than 6 miles, scattered clouds at 2,500 feet, overcast at 5,000 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 JAC 6:44 pm MDT (00:44 UTC) (civil twilight ends 7:13 pm MDT (01:13 UTC)). At 120 knots the arrival at JAC is before sunrise there (7:33 am MDT (13:33 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, 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, Jackson Hole Airport.