Denver International to Boeing Fld/King County International DEN → BFI
890 nautical miles (1,024 statute miles) northwest on a straight line, true course 307°, about 299° magnetic at the departure end (variation 8E). At 120 knots that is 7 h 18 min at the quickest height in today's winds (8,500 ft, a 2-knot tailwind), arriving about 6:04 am PDT (13:04 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 4W: moderate turbulence above 18,000 ft from 18,000 ft to 38,000 ft. Over the first 297 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the first 287 nm of the route.
- 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 40 to 218 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 109 to 692 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 138 to 544 nm out.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 148 to 227 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 425 to 623 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 445 to 613 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 554 to 771 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 188 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 DEN.
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 westbound cruising heights for this course (VFR: even 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 (DEN, RKS, LND, PIH, DLN, BOI, LWS, YKM, SEA). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 8,500 ft | 210° at 7 kt | −2 kt | -1 °C | 122 kt | 7 h 18 min | 6:04 am PDT (13:04 UTC) |
| 10,500 ft | 230° at 11 kt | +2 kt | -3 °C | 118 kt | 7 h 33 min | 6:19 am PDT (13:19 UTC) |
| 12,500 ft | 230° at 15 kt | +4 kt | -5 °C | 116 kt | 7 h 40 min | 6:26 am PDT (13:26 UTC) |
| 14,500 ft | 220° at 18 kt | +2 kt | -9 °C | 118 kt | 7 h 33 min | 6:19 am PDT (13:19 UTC) |
| 16,500 ft | 220° at 21 kt | 0 | -12 °C | 120 kt | 7 h 25 min | 6:11 am PDT (13:11 UTC) |
| 18,000 ft FL180 | 210° at 23 kt | −1 kt | -15 °C | 121 kt | 7 h 21 min | 6:07 am PDT (13:07 UTC) |
| 24,000 ft FL240 | 210° at 28 kt | −2 kt | -26 °C | 122 kt | 7 h 18 min | 6:04 am PDT (13:04 UTC) |
| 30,000 ft FL300 | 220° at 34 kt | +6 kt | -32 °C | 114 kt | 7 h 48 min | 6:34 am PDT (13:34 UTC) |
| 34,000 ft FL340 | 230° at 41 kt | +9 kt | -36 °C | 111 kt | 8 h 01 min | 6:47 am PDT (13:47 UTC) |
| 39,000 ft FL390 | 230° at 43 kt | +13 kt | -42 °C | 107 kt | 8 h 19 min | 7:05 am PDT (14:05 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| DEN | used from 0 nm out; 25 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° | ||
| RKS | used from 99 nm out; 104 nm from the line | 200/41 | 220/44 1° | 220/35 -11° | 220/46 -24° | 210/53 -27° | 220/62 -35° | 230/61 -44° | ||
| LND | used from 247 nm out; 43 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° | ||
| PIH | used from 346 nm out; 57 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° | |
| DLN | used from 445 nm out; 71 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° | ||
| BOI | used from 544 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° | |
| LWS | used from 593 nm out; 59 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° |
| YKM | used from 742 nm out; 40 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° |
| SEA | used from 841 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° |
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 |
|---|---|---|---|---|---|---|---|
| DEN Denver, CO | departure | no report just now | 5,433 ft | ||||
| BJC Denver, CO | 20 nm out, 10 nm southwest of the line, tower | no report just now | 5,673 ft | ||||
| DWX Dixon, WY | 148 nm out, 19 nm southwest of the line | no report just now | 6,548 ft | ||||
| BPI Big Piney, WY | 297 nm out, 8 nm south of the line | no report just now | 6,993 ft | ||||
| IDA Idaho Falls, ID | 396 nm out, 7 nm southwest of the line, tower | no report just now | 4,743 ft | ||||
| LLJ Challis, ID | 504 nm out, 5 nm west of the line | no report just now | 5,075 ft | ||||
| MYL Mc Call, ID | 593 nm out, 25 nm south of the line | no report just now | 5,024 ft | ||||
| ALW Walla Walla, WA | 702 nm out, 5 nm southwest of the line, tower | no report just now | 1,194 ft | ||||
| PSC Pasco, WA | 742 nm out, 12 nm south of the line, tower | no report just now | 410 ft | ||||
| ELN Ellensburg, WA | 811 nm out, 4 nm north of the line | no report just now | 1,763 ft | ||||
| BFI Seattle, WA | destination | no report just now | 21 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 BFI when you get there the forecast at the estimated arrival, 6:04 am PDT (13:04 UTC)
BFI 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 DEN 6:24 pm MDT (00:24 UTC), at BFI 6:27 pm PDT (01:27 UTC) (civil twilight ends 6:58 pm PDT (01:58 UTC)). At 120 knots the arrival at BFI is before sunrise there (7:23 am PDT (14:23 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: Denver International, Boeing Fld/King County International.