Plan a flight · Sun 6:38 pm PDT (01:38 UTC)

Seattle-Tacoma International to Idaho Falls Regional SEA → IDA

491 nautical miles (565 statute miles) southeast on a straight line, true course 115°, about 099° magnetic at the departure end (variation 16E). At 120 knots that is 3 h 37 min at the quickest height in today's winds (39,000 ft, a 16-knot tailwind), arriving about 11:15 pm MDT (05:15 UTC), after sunset at the destination. Right now SEA is VFR, wind from the north (350°) at 11 knots; IDA is IFR, wind from the south-southeast (150°) at 6 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: 1,434 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 138 nm of the route.
AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 98 to 324 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 314 nm of the route.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 196 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 157 nm of the route.
AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the last 157 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

PC12 at 13,000 ft, 19 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. 39 nm along the route, 19 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, 19 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. 39 nm along the route, 19 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, 32 nm south, 6:18 pm PDT (01:18 UTC): light rime icing, -12 °C, remarks: zse. 98 nm along the route, 32 nm south 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, 19 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. 147 nm along the route, 19 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, 15 nm southwest, 5:56 pm PDT (00:56 UTC): overcast above 6,000 ft. 187 nm along the route, 15 nm southwest 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
PC12 at 15,000 ft, 47 nm east, 4:47 pm PDT (23:47 UTC): light rime icing above 15,000 ft. At the destination end, 47 nm east of the line.
as filed, and in English
```
JAC UA /OV JAC200025/TM 2347/FL150/TP PC12/IC LGT RIME 150 /ZLC
```
Report
a routine report filed through JAC
Where
25 nm south (200°) of JAC
Time
23:47 UTC
Height
at 15,000 ft
Aircraft
PC12
Icing
light rime at 15,000 ft zlc

Winds aloft along the route, and the time en route the forecast for use 20:00–03:00 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 6 forecast points nearest it (SEA, YKM, LWS, BOI, 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	020° at 10 kt	−1 kt		121 kt	4 h 03 min	11:41 pm MDT (05:41 UTC)
5,500 ft	020° at 10 kt	−2 kt	4 °C	122 kt	4 h 01 min	11:39 pm MDT (05:39 UTC)
7,500 ft	030° at 10 kt	+1 kt	-3 °C	119 kt	4 h 08 min	11:46 pm MDT (05:46 UTC)
9,500 ft	030° at 9 kt	+1 kt	-5 °C	119 kt	4 h 08 min	11:46 pm MDT (05:46 UTC)
11,500 ft	070° at 3 kt	+2 kt	-8 °C	118 kt	4 h 10 min	11:48 pm MDT (05:48 UTC)
13,500 ft	150° at 3 kt	+3 kt	-11 °C	117 kt	4 h 12 min	11:50 pm MDT (05:50 UTC)
15,500 ft	170° at 5 kt	+4 kt	-14 °C	116 kt	4 h 14 min	11:52 pm MDT (05:52 UTC)
17,500 ft	180° at 8 kt	+5 kt	-18 °C	115 kt	4 h 16 min	11:54 pm MDT (05:54 UTC)
18,000 ft FL180	180° at 9 kt	+5 kt	-19 °C	115 kt	4 h 16 min	11:54 pm MDT (05:54 UTC)
24,000 ft FL240	210° at 16 kt	0	-26 °C	120 kt	4 h 06 min	11:44 pm MDT (05:44 UTC)
30,000 ft FL300	210° at 25 kt	+1 kt	-36 °C	119 kt	4 h 08 min	11:46 pm MDT (05:46 UTC)
34,000 ft FL340	230° at 34 kt	−9 kt	-38 °C	129 kt	3 h 48 min	11:26 pm MDT (05:26 UTC)
39,000 ft FL390	240° at 37 kt	−16 kt	-42 °C	136 kt	3 h 37 min	11:15 pm MDT (05:15 UTC)

Based on data from the 11th at 18:00 UTC; valid on the 12th at 00:00 UTC for use 20:00 to 03:00 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	360/9	350/10 1°	010/10 -5°	030/20 -11°	020/60 -17°	010/86 -26°	360/90 -40°	010/68 -42°	360/31 -43°
YKM	used from 49 nm out; 22 nm from the line	030/16	020/18 0°	030/30 -8°	030/23 -13°	020/40 -23°	010/73 -29°	010/54 -36°	360/29 -37°	330/16 -40°
LWS	used from 147 nm out; 65 nm from the line	010/5	050/14 -2°	040/12 -6°	160/7 -10°	190/30 -22°	200/54 -27°	200/48 -35°	210/40 -37°	230/32 -41°
BOI	used from 295 nm out; 91 nm from the line		330/14 4°	230/5 -2°	220/20 -7°	210/37 -20°	200/59 -26°	200/67 -34°	210/73 -35°	220/62 -41°
DLN	used from 344 nm out; 92 nm from the line			080/10 -3°	180/8 -3°	180/23 -14°	200/58 -22°	200/80 -36°	220/85 -41°	230/81 -45°
PIH	used from 442 nm out; 49 nm from the line		270/10	270/13 1°	210/16 -2°	200/56 -11°	200/51 -23°	200/68 -33°	220/77 -37°	230/73 -44°

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 5,000 feet	from the north (350°) at 11 knots	10+ mi	none	432 ft	5:53 pm PDT (00:53 UTC)
ESW Easton, WA	49 nm out, 9 nm north of the line	no report just now				2,226 ft
YKM Yakima, WA	88 nm out, 16 nm southwest of the line, tower	VFR Sky: overcast at 9,000 feet	calm	10+ mi	9,000 ft	1,098 ft	00:53 UTC
PSC Pasco, WA	147 nm out, 6 nm south of the line, tower	VFR Sky: overcast at 9,500 feet	from the northeast (040°) at 11 knots	10+ mi	9,500 ft	410 ft	00:53 UTC
ALW Walla Walla, WA	187 nm out, 2 nm northwest of the line, tower	VFR Sky: overcast at 5,000 feet	from the south-southwest (210°) at 3 knots	10+ mi	5,000 ft	1,194 ft	00:53 UTC
JSY Joseph, OR	246 nm out, 17 nm southwest of the line	VFR	from the south-southwest (210°) at 4 knots	10+ mi	none	4,126 ft	14:30 UTC
MYL Mc Call, ID	304 nm out, 19 nm southwest of the line	VFR Sky: a broken layer at 3,400 feet, overcast at 6,000 feet	from the west-northwest (300°) at 7 knots	10+ mi	3,400 ft	5,024 ft	00:51 UTC
LLJ Challis, ID	383 nm out, 4 nm north of the line	marginal VFR Sky: overcast at 2,600 feet Weather: light rain	from the north-northwest (340°) at 11 knots	10+ mi	2,600 ft	5,075 ft	00:55 UTC
AOC Arco, ID	442 nm out, 24 nm southwest of the line	no report just now				5,334 ft
IDA Idaho Falls, ID	destination	IFR Sky: a broken layer at 700 feet, a broken layer at 3,200 feet, overcast at 4,000 feet Weather: light rain	from the south-southeast (150°) at 6 knots	10+ mi	700 ft	4,743 ft	7:31 pm MDT (01:31 UTC)

The highest airport on this list sits at 5,334 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At IDA when you get there the forecast at the estimated arrival, 11:15 pm MDT (05:15 UTC)

Wind light and variable, visibility 6 miles, light rain showers, mist, scattered clouds at 700 feet, overcast at 1,500 feet marginal VFR

The whole forecast for IDA

From Sun 6:00 pm MDT (00:00 UTC): wind light and variable, visibility 3 miles, rain, mist, a broken layer at 700 feet, overcast at 1,500 feet
From Sun 8:00 pm MDT (02:00 UTC): wind light and variable, visibility 6 miles, light rain showers, mist, scattered clouds at 700 feet, overcast at 1,500 feet
From Mon 6:00 am MDT (12:00 UTC): wind light and variable, visibility 5 miles, light rain, mist, scattered clouds at 1,000 feet, overcast at 1,500 feet
From Mon 12:00 pm MDT (18:00 UTC): wind from the southwest at 6 knots, visibility 6 miles, light rain showers, mist, scattered clouds at 1,500 feet, overcast at 2,500 feet

The forecast for SEA, the departure

From Sun 5:00 pm PDT (00:00 UTC): wind from the north at 12 knots, gusting to 20, visibility more than 6 miles, a few clouds at 2,000 feet, a few clouds at 5,000 feet
From Sun 8:00 pm PDT (03:00 UTC): wind from the northeast 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 IDA 6:50 pm MDT (00:50 UTC) (civil twilight ends 7:19 pm MDT (01:19 UTC)). At 120 knots the arrival at IDA is after sunset there (6:52 pm MDT (00:52 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, 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, Idaho Falls Regional.