Boeing Fld/King County International to Denver International BFI → DEN
890 nautical miles (1,024 statute miles) southeast on a straight line, true course 115°, about 100° magnetic at the departure end (variation 15E). At 120 knots that is 6 h 42 min at the quickest height in today's winds (39,000 ft, a 13-knot tailwind), arriving about 6:28 am MDT (12:28 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: 192 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 188 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 119 to 336 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 198 to 781 nm out.
- 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 route from 267 to 465 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 277 to 445 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 346 to 752 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 38,000 ft. Over the last 297 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 287 nm of the route.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 663 to 742 nm out.
- 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 route from 672 to 850 nm out.
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 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 9 forecast points nearest it (SEA, YKM, LWS, BOI, DLN, PIH, LND, RKS, DEN). 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 | 060° at 7 kt | +4 kt | 2 °C | 116 kt | 7 h 40 min | 7:26 am MDT (13:26 UTC) |
| 7,500 ft | 200° at 7 kt | +2 kt | 0 °C | 118 kt | 7 h 33 min | 7:19 am MDT (13:19 UTC) |
| 9,500 ft | 220° at 8 kt | 0 | -2 °C | 120 kt | 7 h 25 min | 7:11 am MDT (13:11 UTC) |
| 11,500 ft | 230° at 13 kt | −4 kt | -4 °C | 124 kt | 7 h 11 min | 6:57 am MDT (12:57 UTC) |
| 13,500 ft | 230° at 17 kt | −3 kt | -7 °C | 123 kt | 7 h 14 min | 7:00 am MDT (13:00 UTC) |
| 15,500 ft | 220° at 19 kt | −1 kt | -10 °C | 121 kt | 7 h 21 min | 7:07 am MDT (13:07 UTC) |
| 17,500 ft | 210° at 22 kt | 0 | -14 °C | 120 kt | 7 h 25 min | 7:11 am MDT (13:11 UTC) |
| 18,000 ft FL180 | 210° at 23 kt | +1 kt | -15 °C | 119 kt | 7 h 29 min | 7:15 am MDT (13:15 UTC) |
| 24,000 ft FL240 | 210° at 28 kt | +1 kt | -26 °C | 119 kt | 7 h 29 min | 7:15 am MDT (13:15 UTC) |
| 30,000 ft FL300 | 220° at 34 kt | −6 kt | -32 °C | 126 kt | 7 h 04 min | 6:50 am MDT (12:50 UTC) |
| 34,000 ft FL340 | 230° at 41 kt | −10 kt | -36 °C | 130 kt | 6 h 51 min | 6:37 am MDT (12:37 UTC) |
| 39,000 ft FL390 | 230° at 43 kt | −13 kt | -42 °C | 133 kt | 6 h 42 min | 6:28 am MDT (12:28 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; 23 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; 26 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 148 nm out; 63 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° |
| BOI | used from 297 nm out; 97 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° | |
| DLN | used from 346 nm out; 86 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 445 nm out; 55 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° | |
| LND | used from 544 nm out; 79 nm from the line | 200/23 6° | 220/31 1° | 220/39 -11° | 230/39 -23° | 220/51 -28° | 220/66 -37° | 230/68 -45° | ||
| RKS | used from 643 nm out; 31 nm from the line | 200/41 | 220/44 1° | 220/35 -11° | 220/46 -24° | 210/53 -27° | 220/62 -35° | 230/61 -44° | ||
| DEN | used from 791 nm out; 74 nm from the line | 240/21 14° | 250/44 6° | 220/49 -8° | 220/49 -21° | 230/54 -30° | 240/57 -35° | 240/49 -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 | no report just now | 21 ft | ||||
| YKM Yakima, WA | 89 nm out, 21 nm southwest of the line, tower | no report just now | 1,098 ft | ||||
| PSC Pasco, WA | 148 nm out, 12 nm south of the line, tower | no report just now | 410 ft | ||||
| ALW Walla Walla, WA | 188 nm out, 5 nm southwest of the line, tower | no report just now | 1,194 ft | ||||
| MYL Mc Call, ID | 297 nm out, 25 nm south of the line | no report just now | 5,024 ft | ||||
| LLJ Challis, ID | 386 nm out, 5 nm west of the line | no report just now | 5,075 ft | ||||
| IDA Idaho Falls, ID | 494 nm out, 7 nm southwest of the line, tower | no report just now | 4,743 ft | ||||
| BPI Big Piney, WY | 593 nm out, 8 nm south of the line | no report just now | 6,993 ft | ||||
| DWX Dixon, WY | 742 nm out, 19 nm southwest of the line | no report just now | 6,548 ft | ||||
| BJC Denver, CO | 870 nm out, 10 nm southwest of the line, tower | no report just now | 5,673 ft | ||||
| DEN Denver, CO | destination | no report just now | 5,433 ft |
The highest airport on this list sits at 6,993 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At DEN when you get there the forecast at the estimated arrival, 6:28 am MDT (12:28 UTC)
DEN has no terminal forecast; use the nearest airport that does.
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 DEN 6:24 pm MDT (00:24 UTC) (civil twilight ends 6:51 pm MDT (00:51 UTC)). At 120 knots the arrival at DEN is before sunrise there (7:05 am MDT (13:05 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, Denver International.