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 39 min at the quickest height in today's winds (5,500 ft, a 11-knot tailwind), arriving about 11:10 pm MDT (05:10 UTC), after sunset at the destination. Right now BFI is VFR, wind variable at 4 knots; SGU is VFR, wind from the east-northeast (060°) at 4 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
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 25,000 ft to 39,000 ft. Over the first 0 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 14,000 ft. Over the route from 128 to 237 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 395 nm of the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 316 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 109 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 89 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
- B738 at 21,000 ft, 48 nm northeast, 2:06 pm PDT (21:06 UTC): moderate turbulence, remarks: during the descent zlc. 345 nm along the route, 48 nm northeast of the line.
as filed, and in English
BOI UA /OV BOI220040/TM 2106/FL210/TP B738/TB MOD/RM DURD /ZLC
- Report
- a routine report filed through BOI
- Where
- 40 nm southwest (220°) of BOI
- Time
- 21:06 UTC
- Height
- at 21,000 ft
- Aircraft
- B738
- Turbulence
- moderate
- Remarks
- during the descent zlc
- UAL493 at 24,000 ft, 14 nm south, 3:54 pm PDT (22:54 UTC): moderate turbulence. At the destination end, 14 nm south of the line.
as filed, and in English
ARP UAL493 3648N 11330W 2254 F240 TB MODERATE SK IN CLOUDS IC LIGHT
- Report
- a routine report filed through ARP
- E75L at 33,000 ft, 5 nm northeast, 1:40 pm PDT (20:40 UTC): light to moderate chop turbulence, remarks: zse. 128 nm along the route, 5 nm northeast of the line.
as filed, and in English
DLS UA /OV LTJ053027/TM 2040/FL330/TP E75L/TB LGT OCNL MOD CHOP /RM ZSE
- Report
- a routine report filed through DLS
- Where
- 27 nm northeast (053°) of LTJ
- Time
- 20:40 UTC
- Height
- at 33,000 ft
- Aircraft
- E75L
- Turbulence
- light occasional moderate chop
- Remarks
- zse
- C210 at 9,000 ft, 15 nm northeast, 3:51 pm PDT (22:51 UTC): light rime icing, -13 °C, remarks: base 080-ZSE. 168 nm along the route, 15 nm northeast of the line.
as filed, and in English
PDT UA /OV PDT230040/TM 2251/FL090/TP C210/TA M13/IC LGT RIME/RM BASE 080-ZSE
- Report
- a routine report filed through PDT
- Where
- 40 nm southwest (230°) of PDT
- Time
- 22:51 UTC
- Height
- at 9,000 ft
- Aircraft
- C210
- Temperature
- −13 °C
- Icing
- light rime
- Remarks
- base 080-ZSE
- E75L at 25,000 ft, 38 nm northeast, 2:19 pm PDT (21:19 UTC): light to moderate chop turbulence, -21 °C. 345 nm along the route, 38 nm northeast of the line.
as filed, and in English
BOI UA /OV BOI220050/TM 2119/FL250/TP E75L/TA M21/TB CONS LGT OCNL MOD CHOP/IC CLR /ZLC
- Report
- a routine report filed through BOI
- Where
- 50 nm southwest (220°) of BOI
- Time
- 21:19 UTC
- Height
- at 25,000 ft
- Aircraft
- E75L
- Temperature
- −21 °C
- Turbulence
- continuous light occasional moderate chop
- Icing
- clear zlc
- TBM8 at 19,000 ft, 34 nm northeast, 2:58 pm PDT (21:58 UTC): light rime icing from 10,000 ft to 18,000 ft, -20 °C. 355 nm along the route, 34 nm northeast of the line.
as filed, and in English
BOI UA /OV BOI209055/TM 2158/FL190/TP TBM8/TA M20/IC LGT RIME 180-100 /ZLC
- Report
- a routine report filed through BOI
- Where
- 55 nm southwest (209°) of BOI
- Time
- 21:58 UTC
- Height
- at 19,000 ft
- Aircraft
- TBM8
- Temperature
- −20 °C
- Icing
- light rime from 18,000 ft to 10,000 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 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 | 360° at 14 kt | −11 kt | 0 °C | 131 kt | 5 h 39 min | 11:10 pm MDT (05:10 UTC) |
| 7,500 ft | 340° at 5 kt | −4 kt | 0 °C | 124 kt | 5 h 58 min | 11:29 pm MDT (05:29 UTC) |
| 9,500 ft | 350° at 4 kt | −3 kt | -3 °C | 123 kt | 6 h 01 min | 11:32 pm MDT (05:32 UTC) |
| 11,500 ft | 260° at 6 kt | −2 kt | -6 °C | 122 kt | 6 h 04 min | 11:35 pm MDT (05:35 UTC) |
| 13,500 ft | 260° at 8 kt | −2 kt | -10 °C | 122 kt | 6 h 04 min | 11:35 pm MDT (05:35 UTC) |
| 15,500 ft | 260° at 9 kt | −2 kt | -14 °C | 122 kt | 6 h 04 min | 11:35 pm MDT (05:35 UTC) |
| 17,500 ft | 260° at 9 kt | −2 kt | -17 °C | 122 kt | 6 h 04 min | 11:35 pm MDT (05:35 UTC) |
| 18,000 ft FL180 | 260° at 10 kt | −2 kt | -18 °C | 122 kt | 6 h 04 min | 11:35 pm MDT (05:35 UTC) |
| 24,000 ft FL240 | 270° at 8 kt | −3 kt | -26 °C | 123 kt | 6 h 01 min | 11:32 pm MDT (05:32 UTC) |
| 30,000 ft FL300 | 240° at 26 kt | −1 kt | -32 °C | 121 kt | 6 h 07 min | 11:38 pm MDT (05:38 UTC) |
| 34,000 ft FL340 | 230° at 33 kt | +3 kt | -36 °C | 117 kt | 6 h 19 min | 11:50 pm MDT (05:50 UTC) |
| 39,000 ft FL390 | 230° at 36 kt | +4 kt | -42 °C | 116 kt | 6 h 23 min | 11:54 pm MDT (05:54 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; 21 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; 31 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° |
| RDM | used from 148 nm out; 73 nm from the line | 010/15 -2° | 030/21 -8° | 020/26 -12° | 020/46 -22° | 010/72 -27° | 360/47 -34° | 340/31 -35° | 320/20 -40° | |
| BOI | used from 296 nm out; 88 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° | |
| BAM | used from 395 nm out; 64 nm from the line | 270/8 4° | 230/27 -4° | 220/49 -18° | 210/52 -26° | 220/77 -29° | 220/71 -33° | 220/63 -43° | ||
| ELY | used from 543 nm out; 26 nm from the line | 210/20 4° | 240/21 -1° | 230/37 -13° | 200/58 -25° | 220/73 -27° | 220/73 -36° | 220/69 -44° | ||
| BCE | used from 691 nm out; 79 nm from the line | 210/47 0° | 200/50 -12° | 220/31 -23° | 220/56 -26° | 220/58 -35° | 230/58 -45° |
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 5,000 feet | variable at 4 knots | 10+ mi | none | 21 ft | 3:53 pm PDT (22:53 UTC) |
| PLU Puyallup, WA | 20 nm out, 14 nm southwest of the line | VFR Weather: light drizzle | from the north (010°) at 6 knots | 10+ mi | none | 537 ft | 23:15 UTC |
| GCD John Day, OR | 237 nm out, 12 nm northeast of the line | VFR Sky: a broken layer at 3,300 feet, a broken layer at 3,900 feet, a broken layer at 4,600 feet | from the northwest (320°) at 12 knots, gusting to 20 | 10+ mi | 3,300 ft | 3,702 ft | 23:15 UTC |
| REO Rome, OR | 355 nm out, 8 nm west of the line | reported, no category | from the north (360°) at 8 knots | none | 4,053 ft | 22:52 UTC | |
| EKO Elko, NV | 493 nm out, 20 nm northeast of the line | VFR Sky: a few clouds at 12,000 feet | from the southwest (220°) at 6 knots | 10+ mi | none | 5,139 ft | 22:56 UTC |
| ELY Ely, NV | 592 nm out, 12 nm northeast of the line | VFR | from the south (190°) at 12 knots | 10+ mi | none | 6,259 ft | 22:53 UTC |
| SGU St George, UT | destination | VFR Sky: a few clouds at 6,000 feet, a broken layer at 10,000 feet Weather: light rain | from the east-northeast (060°) at 4 knots | 10+ mi | 10,000 ft | 2,883 ft | 4:56 pm MDT (22:56 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, 11:10 pm MDT (05:10 UTC)
Wind light and variable, visibility more than 6 miles, low-level wind shear, a broken layer at 7,000 feet VFR
The whole forecast for SGU
- From Sun 4:00 pm MDT (22:00 UTC): wind from the northwest at 10 knots, visibility more than 6 miles, light rain showers, scattered clouds at 2,000 feet, a broken layer at 5,000 feet
- From Sun 8:00 pm MDT (02:00 UTC): wind light and variable, visibility more than 6 miles, low-level wind shear, a broken layer at 7,000 feet
The forecast for BFI, the departure
- From Sun 11:00 am PDT (18:00 UTC): wind from the north at 5 knots, visibility more than 6 miles, a few clouds at 10,000 feet
- From Sun 2:00 pm PDT (21:00 UTC): wind from the north-northwest at 9 knots, visibility more than 6 miles, scattered clouds at 20,000 feet
- From Sun 7:00 pm PDT (02:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
- From Mon 2:00 am PDT (09:00 UTC): wind from the southeast at 2 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 3 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 after sunset there (7:03 pm MDT (01:03 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.