Boeing Fld/King County International to Harry Reid International BFI → LAS
757 nautical miles (872 statute miles) southeast on a straight line, true course 153°, about 138° magnetic at the departure end (variation 15E). At 120 knots that is 5 h 58 min at the quickest height in today's winds (24,000 ft, a 7-knot tailwind), arriving about 11:07 pm PDT (06:07 UTC), after sunset at the destination. 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: 9 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 W72W: thunderstorms (a convective SIGMET) up to 30,000 ft, moving from the southwest at 20 knots, until 6:55 pm PDT (01:55 UTC). Over the route from 538 to 568 nm out.
as issued
WSUS33 KKCI 112355 MKCW WST 112355 CONVECTIVE SIGMET 72W VALID UNTIL 0155Z NV FROM 60SSW BAM-60W ELY-OAL-40WNW OAL-60SSW BAM AREA TS MOV FROM 23020KT. TOPS TO FL300.
- 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 130 to 229 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 578 nm of the route.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the last 389 nm of the route.
- AIRMET TANGO 3W: moderate turbulence below 18,000 ft (due to mountain wave) up to 15,000 ft. Over the route from 568 to 658 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 140 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 90 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). Near the route, at the destination end.
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
Not fetched just now.
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, LKV, BAM, ELY, LAS). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 7,500 ft | 340° at 5 kt | −4 kt | 0 °C | 124 kt | 6 h 06 min | 11:15 pm PDT (06:15 UTC) |
| 9,500 ft | 330° at 5 kt | −5 kt | -3 °C | 125 kt | 6 h 03 min | 11:12 pm PDT (06:12 UTC) |
| 11,500 ft | 280° at 7 kt | −4 kt | -6 °C | 124 kt | 6 h 06 min | 11:15 pm PDT (06:15 UTC) |
| 13,500 ft | 270° at 8 kt | −3 kt | -10 °C | 123 kt | 6 h 09 min | 11:18 pm PDT (06:18 UTC) |
| 15,500 ft | 270° at 9 kt | −4 kt | -14 °C | 124 kt | 6 h 06 min | 11:15 pm PDT (06:15 UTC) |
| 17,500 ft | 270° at 10 kt | −4 kt | -17 °C | 124 kt | 6 h 06 min | 11:15 pm PDT (06:15 UTC) |
| 18,000 ft FL180 | 270° at 10 kt | −4 kt | -18 °C | 124 kt | 6 h 06 min | 11:15 pm PDT (06:15 UTC) |
| 24,000 ft FL240 | 290° at 11 kt | −7 kt | -26 °C | 127 kt | 5 h 58 min | 11:07 pm PDT (06:07 UTC) |
| 30,000 ft FL300 | 260° at 23 kt | −4 kt | -31 °C | 124 kt | 6 h 06 min | 11:15 pm PDT (06:15 UTC) |
| 34,000 ft FL340 | 240° at 28 kt | +4 kt | -35 °C | 116 kt | 6 h 32 min | 11:41 pm PDT (06:41 UTC) |
| 39,000 ft FL390 | 240° at 33 kt | +5 kt | -42 °C | 115 kt | 6 h 35 min | 11:44 pm PDT (06:44 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 50 nm out; 39 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 149 nm out; 52 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° | |
| LKV | used from 249 nm out; 88 nm from the line | 010/18 -6° | 280/7 -11° | 290/9 -22° | 280/13 -27° | 290/20 -31° | 260/19 -34° | 260/27 -39° | ||
| BAM | used from 399 nm out; 62 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 548 nm out; 88 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° | ||
| LAS | used from 648 nm out; 85 nm from the line | 200/25 11° | 230/22 5° | 240/25 -1° | 220/37 -12° | 220/44 -21° | 210/52 -27° | 210/60 -34° | 220/58 -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 | no report just now | 21 ft | ||||
| PLU Puyallup, WA | 20 nm out, 12 nm southwest of the line | no report just now | 537 ft | ||||
| DLS The Dalles, OR | 120 nm out, 11 nm southwest of the line | no report just now | 246 ft | ||||
| BNO Burns, OR | 279 nm out, 22 nm northeast of the line | no report just now | 4,148 ft | ||||
| WMC Winnemucca, NV | 439 nm out, 4 nm southeast of the line | no report just now | 4,307 ft | ||||
| TMT Austin, NV | 528 nm out, 10 nm southwest of the line | no report just now | 5,735 ft | ||||
| LAS Las Vegas, NV | destination | no report just now | 2,183 ft |
The highest airport on this list sits at 5,735 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At LAS when you get there the forecast at the estimated arrival, 11:07 pm PDT (06:07 UTC)
LAS has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/8890 LAS VEGAS, NV, Tuesday, October 13, 2026 Local on the route, at the destination end · a VIP movement · starts tomorrow · ZLA
- 6/8808 Las Vegas, NV, Tuesday, October 13, 2026 Local on the route, at the destination end · security · starts tomorrow · ZLA
Daylight
Sunset at BFI 6:27 pm PDT (01:27 UTC), at LAS 6:08 pm PDT (01:08 UTC) (civil twilight ends 6:34 pm PDT (01:34 UTC)). At 120 knots the arrival at LAS is before sunrise there (6:44 am PDT (13:44 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, Harry Reid International.