Boeing Fld/King County International to St. George Regional BFI → SGU
740 nautical miles (852 statute miles) southeast on a straight line, true course 145°, about 130° magnetic at the departure end (variation 15E). At 120 knots that is 5 h 42 min at the quickest height in today's winds (24,000 ft, a 10-knot tailwind), arriving about 2:25 am MDT (08:25 UTC), after sunset at the destination. Right now BFI is VFR, wind calm; SGU is VFR, 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: 4 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 W10W: thunderstorms (a convective SIGMET) up to 30,000 ft, moving from the southwest at 20 knots, until 8:55 pm PDT (03:55 UTC). Over the route from 484 to 572 nm out.
as issued
WSUS33 KKCI 120155 MKCW WST 120155 CONVECTIVE SIGMET 10W VALID UNTIL 0355Z NV FROM 70SW TWF-40NNW BVL-40SW ELY-30ESE OAL-40WNW OAL-70SW TWF AREA TS MOV FROM 23020KT. TOPS TO FL300.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 207 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 128 to 257 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 563 nm of the route.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the last 365 nm of the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 345 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 197 nm of the route.
- AIRMET SIERRA 2E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the last 59 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 BFI.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- SB20 at 16,000 ft, 49 nm northeast, 6:52 pm PDT (01:52 UTC): remarks: zse. At the departure end, 49 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, 1 nm northeast, 6:54 pm PDT (01:54 UTC): remarks: zse. 49 nm along the route, 1 nm northeast 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, 2 nm east, 5:42 pm PDT (00:42 UTC): remarks: zse. 49 nm along the route, 2 nm east 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, 2 nm east, 5:42 pm PDT (00:42 UTC): remarks: zse. 49 nm along the route, 2 nm east 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, 21 nm northeast, 6:18 pm PDT (01:18 UTC): light rime icing, -12 °C, remarks: zse. 109 nm along the route, 21 nm northeast 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
- GLF4 at 25,000 ft, 35 nm east, 5:30 pm PDT (00:30 UTC): overcast up to 24,000 ft, remarks: visual conditions FL250 zlawc. At the destination end, 35 nm east of the line.
as filed, and in English
PUC UA /OV BCE200040/TM 0030/FL250/TP GLF4/SK OVC-TOP240/RM VMC FL250 /ZLAWC AWC-WEB
- Report
- a routine report filed through PUC
- Where
- 40 nm south (200°) of BCE
- Time
- 00:30 UTC
- Height
- at 25,000 ft
- Aircraft
- GLF4
- Sky
- overcast, tops 24,000 ft
- Remarks
- visual conditions FL250 zlawc
- B38M at 27,000 ft, 24 nm southwest, 5:03 pm PDT (00:03 UTC): light rime icing, -27 °C, remarks: during the descent. At the destination end, 24 nm southwest of the line.
as filed, and in English
CDC UA /OV MMM085025/TM 0003/FL270/TP B38M/TA M27/IC LGT RIME/RM DURD AWC-WEB
- Report
- a routine report filed through CDC
- Where
- 25 nm east (085°) of MMM
- Time
- 00:03 UTC
- Height
- at 27,000 ft
- Aircraft
- B38M
- Temperature
- −27 °C
- Icing
- light rime
- Remarks
- during the descent
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 7 forecast points nearest it (SEA, YKM, RDM, BOI, BAM, ELY, BCE). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 5,500 ft | 030° at 11 kt | −4 kt | 0 °C | 124 kt | 5 h 58 min | 2:41 am MDT (08:41 UTC) |
| 7,500 ft | light and variable | 0 | -1 °C | 120 kt | 6 h 10 min | 2:53 am MDT (08:53 UTC) |
| 9,500 ft | 360° at 3 kt | −2 kt | -4 °C | 122 kt | 6 h 04 min | 2:47 am MDT (08:47 UTC) |
| 11,500 ft | 300° at 5 kt | −4 kt | -7 °C | 124 kt | 5 h 58 min | 2:41 am MDT (08:41 UTC) |
| 13,500 ft | 280° at 6 kt | −3 kt | -10 °C | 123 kt | 6 h 01 min | 2:44 am MDT (08:44 UTC) |
| 15,500 ft | 270° at 6 kt | −2 kt | -13 °C | 122 kt | 6 h 04 min | 2:47 am MDT (08:47 UTC) |
| 17,500 ft | 260° at 7 kt | −1 kt | -16 °C | 121 kt | 6 h 07 min | 2:50 am MDT (08:50 UTC) |
| 18,000 ft FL180 | 250° at 8 kt | −1 kt | -17 °C | 121 kt | 6 h 07 min | 2:50 am MDT (08:50 UTC) |
| 24,000 ft FL240 | 290° at 14 kt | −10 kt | -26 °C | 130 kt | 5 h 42 min | 2:25 am MDT (08:25 UTC) |
| 30,000 ft FL300 | 270° at 20 kt | −9 kt | -32 °C | 129 kt | 5 h 44 min | 2:27 am MDT (08:27 UTC) |
| 34,000 ft FL340 | 240° at 25 kt | 0 | -36 °C | 120 kt | 6 h 10 min | 2:53 am MDT (08:53 UTC) |
| 39,000 ft FL390 | 240° at 32 kt | +2 kt | -41 °C | 118 kt | 6 h 16 min | 2:59 am MDT (08:59 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; 21 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 49 nm out; 31 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° |
| RDM | used from 148 nm out; 73 nm from the line | 040/17 -1° | 030/31 -8° | 010/29 -12° | 010/61 -19° | 360/95 -25° | 360/82 -36° | 360/40 -37° | 310/19 -40° | |
| BOI | used from 296 nm out; 88 nm from the line | 300/7 2° | 280/5 -4° | 210/16 -9° | 210/60 -20° | 210/75 -29° | 210/63 -32° | 220/64 -32° | 220/54 -39° | |
| BAM | used from 395 nm out; 64 nm from the line | 310/7 0° | 270/19 -7° | 200/38 -17° | 190/49 -28° | 220/69 -29° | 220/63 -33° | 230/48 -41° | ||
| ELY | used from 543 nm out; 26 nm from the line | 200/39 3° | 210/27 -2° | 210/45 -15° | 220/56 -24° | 210/60 -28° | 210/63 -34° | 220/61 -43° | ||
| BCE | used from 691 nm out; 79 nm from the line | 220/27 -1° | 210/40 -13° | 220/54 -21° | 220/64 -30° | 220/64 -34° | 220/52 -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 |
|---|---|---|---|---|---|---|---|
| BFI Seattle, WA | departure | VFR Sky: a few clouds at 6,000 feet | calm | 10+ mi | none | 21 ft | 6:53 pm PDT (01:53 UTC) |
| PLU Puyallup, WA | 20 nm out, 14 nm southwest of the line | VFR Weather: light drizzle | calm | 10+ mi | none | 537 ft | 02:35 UTC |
| GCD John Day, OR | 237 nm out, 12 nm northeast of the line | marginal VFR Sky: overcast at 3,000 feet | from the northwest (310°) at 8 knots | 10+ mi | 3,000 ft | 3,702 ft | 02:35 UTC |
| REO Rome, OR | 355 nm out, 8 nm west of the line | reported, no category | from the southeast (130°) at 8 knots | none | 4,053 ft | 01:52 UTC | |
| EKO Elko, NV | 493 nm out, 20 nm northeast of the line | VFR Sky: scattered clouds at 4,600 feet, a broken layer at 10,000 feet | calm | 10+ mi | 10,000 ft | 5,139 ft | 01:56 UTC |
| ELY Ely, NV | 592 nm out, 12 nm northeast of the line | VFR | from the south (170°) at 14 knots, gusting to 21 | 10+ mi | none | 6,259 ft | 01:53 UTC |
| SGU St George, UT | destination | VFR Sky: overcast at 11,000 feet | from the south-southeast (150°) at 6 knots | 10+ mi | 11,000 ft | 2,883 ft | 7:56 pm MDT (01:56 UTC) |
The highest airport on this list sits at 6,259 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At SGU when you get there the forecast at the estimated arrival, 2:25 am MDT (08:25 UTC)
Wind from the south-southeast at 8 knots, visibility more than 6 miles, low-level wind shear, scattered clouds at 4,000 feet, a broken layer at 8,000 feet VFR
30% chance between Sun 9:00 pm MDT (03:00 UTC) and 3:00 am MDT (09:00 UTC): wind variable at 10 knots, gusting to 25, light rain showers, a broken layer at 4,000 feet VFR
The whole forecast for SGU
- From Sun 6:00 pm MDT (00:00 UTC): wind light and variable, visibility more than 6 miles, light rain showers, scattered clouds at 3,000 feet, a broken layer at 6,000 feet
- From Sun 9:00 pm MDT (03:00 UTC): wind from the south-southeast at 8 knots, visibility more than 6 miles, low-level wind shear, scattered clouds at 4,000 feet, a broken layer at 8,000 feet
- 30% chance between Sun 9:00 pm MDT (03:00 UTC) and 3:00 am MDT (09:00 UTC): wind variable at 10 knots, gusting to 25, light rain showers, a broken layer at 4,000 feet
- From Mon 8:00 am MDT (14:00 UTC): wind from the south-southeast at 12 knots, gusting to 20, visibility more than 6 miles, light rain showers, scattered clouds at 3,000 feet, a broken layer at 6,000 feet
The forecast for BFI, the departure
- From Sun 5:00 pm PDT (00:00 UTC): wind from the north-northwest at 8 knots, gusting to 18, visibility more than 6 miles, a few clouds at 5,000 feet
- From Sun 7:00 pm PDT (02:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
- From Mon 3:00 am PDT (10:00 UTC): wind light and variable, 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
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 BFI 6:27 pm PDT (01:27 UTC), at SGU 7:01 pm MDT (01:01 UTC) (civil twilight ends 7:27 pm MDT (01:27 UTC)). At 120 knots the arrival at SGU is before sunrise there (7:38 am MDT (13:38 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
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, St. George Regional.