Boeing Fld/King County International to Northwest Arkansas Ntl Airport BFI → XNA
1,411 nautical miles (1,623 statute miles) east on a straight line, true course 108°, about 093° magnetic at the departure end (variation 15E). At 120 knots that is 9 h 44 min at the quickest height in today's winds (34,000 ft, a 25-knot tailwind), arriving about 1:50 pm CDT (18:50 UTC). 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: 1 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 387 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 139 to 417 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 199 to 507 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 278 to 646 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 427 to 666 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 666 to 854 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft (due to mountain wave) from 34,000 ft to 43,000 ft. Over the route from 666 to 844 nm out.
- AIRMET TANGO 2W: moderate turbulence below 18,000 ft (due to mountain wave) up to 22,000 ft. Over the route from 685 to 805 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 695 to 715 nm out.
- AIRMET TANGO 2W: 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 last 427 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
Not fetched just now.
Winds aloft along the route, and the time en route the forecast for use 08:00–15:00 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 11 forecast points nearest it (SEA, YKM, LWS, DLN, LND, BFF, GLD, SLN, ICT, TUL, FSM). 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 | 260° at 20 kt | −15 kt | 135 kt | 10 h 27 min | 2:33 pm CDT (19:33 UTC) | |
| 7,500 ft | 250° at 15 kt | −9 kt | 4 °C | 129 kt | 10 h 56 min | 3:02 pm CDT (20:02 UTC) |
| 9,500 ft | 250° at 14 kt | −7 kt | 4 °C | 127 kt | 11 h 07 min | 3:13 pm CDT (20:13 UTC) |
| 11,500 ft | 240° at 15 kt | −7 kt | 1 °C | 127 kt | 11 h 07 min | 3:13 pm CDT (20:13 UTC) |
| 13,500 ft | 240° at 16 kt | −6 kt | -3 °C | 126 kt | 11 h 12 min | 3:18 pm CDT (20:18 UTC) |
| 15,500 ft | 230° at 16 kt | −4 kt | -8 °C | 124 kt | 11 h 23 min | 3:29 pm CDT (20:29 UTC) |
| 17,500 ft | 220° at 17 kt | −3 kt | -12 °C | 123 kt | 11 h 28 min | 3:34 pm CDT (20:34 UTC) |
| 18,000 ft FL180 | 220° at 17 kt | −2 kt | -13 °C | 122 kt | 11 h 34 min | 3:40 pm CDT (20:40 UTC) |
| 24,000 ft FL240 | 230° at 30 kt | −9 kt | -24 °C | 129 kt | 10 h 56 min | 3:02 pm CDT (20:02 UTC) |
| 30,000 ft FL300 | 250° at 41 kt | −23 kt | -32 °C | 143 kt | 9 h 52 min | 1:58 pm CDT (18:58 UTC) |
| 34,000 ft FL340 | 250° at 43 kt | −25 kt | -37 °C | 145 kt | 9 h 44 min | 1:50 pm CDT (18:50 UTC) |
| 39,000 ft FL390 | 240° at 43 kt | −24 kt | -45 °C | 144 kt | 9 h 48 min | 1:54 pm CDT (18:54 UTC) |
Based on data from the 12th at 06:00 UTC; valid on the 12th at 12:00 UTC for use 08:00 to 15:00 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; 24 nm from the line | 350/5 | 010/6 0° | 010/9 -4° | 010/27 -6° | 010/51 -15° | 360/58 -26° | 360/60 -41° | 350/55 -48° | 340/30 -45° |
| YKM | used from 50 nm out; 33 nm from the line | 360/6 | 360/11 -1° | 030/20 -7° | 040/21 -11° | 020/55 -18° | 010/84 -26° | 010/79 -40° | 010/45 -42° | 350/23 -42° |
| LWS | used from 149 nm out; 54 nm from the line | L/V | 340/5 -3° | L/V -6° | 040/7 -10° | 100/23 -22° | 180/30 -31° | 190/11 -34° | 200/11 -36° | 220/23 -40° |
| DLN | used from 348 nm out; 58 nm from the line | 190/10 -4° | 220/23 -4° | 210/21 -18° | 210/43 -28° | 210/60 -33° | 210/72 -37° | 210/67 -44° | ||
| LND | used from 546 nm out; 75 nm from the line | 240/10 3° | 240/30 0° | 220/42 -13° | 230/52 -23° | 220/54 -33° | 220/52 -36° | 220/53 -44° | ||
| BFF | used from 745 nm out; 100 nm from the line | 280/28 | 260/39 11° | 240/34 5° | 210/38 -11° | 210/52 -22° | 230/61 -31° | 230/61 -36° | 240/56 -45° | |
| GLD | used from 944 nm out; 70 nm from the line | 260/37 | 260/25 14° | 250/27 8° | 230/36 -8° | 230/49 -21° | 250/71 -30° | 260/82 -36° | 250/73 -48° | |
| SLN | used from 1093 nm out; 80 nm from the line | 230/49 | 240/41 22° | 230/26 15° | 220/21 7° | 240/38 -8° | 240/44 -21° | 260/77 -29° | 270/70 -36° | 270/63 -48° |
| ICT | used from 1192 nm out; 33 nm from the line | 230/45 | 240/33 21° | 230/23 14° | 230/22 7° | 240/29 -7° | 240/36 -20° | 260/78 -29° | 270/69 -36° | 270/56 -49° |
| TUL | used from 1291 nm out; 62 nm from the line | 230/42 | 250/23 17° | 220/16 14° | 240/10 8° | 240/20 -6° | 260/28 -17° | 270/61 -29° | 280/52 -38° | 290/46 -50° |
| FSM | used from 1391 nm out; 63 nm from the line | 230/33 | 260/23 15° | 240/23 11° | 230/18 8° | 230/20 -8° | 250/31 -17° | 280/51 -30° | 280/52 -39° | 300/47 -51° |
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 | ||||
| MWH Moses Lake, WA | 119 nm out, 22 nm northeast of the line, tower | no report just now | 1,188 ft | ||||
| LWS Lewiston, ID | 228 nm out, 10 nm north of the line, tower | no report just now | 1,442 ft | ||||
| SMN Salmon, ID | 377 nm out, 7 nm southwest of the line | no report just now | 4,044 ft | ||||
| WYS West Yellowstone, MT | 497 nm out, 20 nm north of the line | no report just now | 6,649 ft | ||||
| RIW Riverton, WY | 646 nm out, 14 nm southwest of the line | no report just now | 5,516 ft | ||||
| CPR Casper, WY | 725 nm out, 20 nm northeast of the line, tower | no report just now | 5,344 ft | ||||
| HEQ Holyoke, CO | 954 nm out, 4 nm south of the line | no report just now | 3,729 ft | ||||
| HLC Hill City, KS | 1093 nm out, 4 nm west of the line | no report just now | 2,238 ft | ||||
| HUT Hutchinson, KS | 1212 nm out, 14 nm southwest of the line, tower | no report just now | 1,542 ft | ||||
| IDP Independence, KS | 1321 nm out, 1 nm southeast of the line | no report just now | 824 ft | ||||
| XNA Fayetteville/Springdale/Rogers, AR | destination | no report just now | 1,288 ft |
The highest airport on this list sits at 6,649 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At XNA when you get there the forecast at the estimated arrival, 1:50 pm CDT (18:50 UTC)
XNA 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 6:25 pm PDT (01:25 UTC), at XNA 6:45 pm CDT (23:45 UTC) (civil twilight ends 7:11 pm CDT (00:11 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, Northwest Arkansas Ntl Airport.