Boeing Fld/King County International to Ellison Onizuka Kona International AT Keahole BFI → KOA
2,339 nautical miles (2,692 statute miles) southwest on a straight line, true course 236°, about 221° magnetic at the departure end (variation 15E). At 120 knots that is 13 h 04 min at the quickest height in today's winds (30,000 ft, a 59-knot tailwind), arriving about 5:49 am HST (15:49 UTC), after sunset at the destination. Right now BFI is VFR, wind calm; KOA is VFR, wind from the west (260°) at 10 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: 3 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 210 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
- EPIC at 31,000 ft, 41 nm southeast, 6:38 pm PDT (01:38 UTC): moderate turbulence from 30,000 ft to 31,000 ft, remarks: zse. At the departure end, 41 nm southeast of the line.
as filed, and in English
AST UA /OV AST070020/TM 0138/FL310/TP EPIC/TB MOD 310-300/RM ZSE
- Report
- a routine report filed through AST
- Where
- 20 nm east (070°) of AST
- Time
- 01:38 UTC
- Height
- at 31,000 ft
- Aircraft
- EPIC
- Turbulence
- moderate from 31,000 ft to 30,000 ft
- Remarks
- zse
- A321 at 13,500 ft, 49 nm southeast, 6:54 pm PDT (01:54 UTC): remarks: zse. At the departure end, 49 nm southeast of the line.
as filed, and in English
SEA UA /OV SEA120045/TM 0154/FL135/TP A321/SK TOP130/RM ZSE
- Report
- a routine report filed through SEA
- Where
- 45 nm southeast (120°) of SEA
- Time
- 01:54 UTC
- Height
- at 13,500 ft
- Aircraft
- A321
- Sky
- TOP130
- Remarks
- zse
- SB20 at 16,000 ft, 50 nm northeast, 6:52 pm PDT (01:52 UTC): remarks: zse. At the departure end, 50 nm northeast of the line.
as filed, and in English
PAE UA /OV PAE075045/TM 0152/FL160/TP SB20/SK TOP120/RM ZSE
- Report
- a routine report filed through PAE
- Where
- 45 nm east (075°) of PAE
- Time
- 01:52 UTC
- Height
- at 16,000 ft
- Aircraft
- SB20
- Sky
- TOP120
- Remarks
- zse
- PC12 at 15,000 ft, 50 nm southeast, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 50 nm southeast of the line.
as filed, and in English
YKM UA /OV YKM270050/TM 0042/FL150/TP PC12/SK TOP130/RM -ZSE
- Report
- a routine report filed through YKM
- Where
- 50 nm west (270°) of YKM
- Time
- 00:42 UTC
- Height
- at 15,000 ft
- Aircraft
- PC12
- Sky
- TOP130
- Remarks
- zse
- PC12 at 13,000 ft, 50 nm southeast, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 50 nm southeast of the line.
as filed, and in English
YKM UA /OV YKM270050/TM 0042/FL130/TP PC12/SK TOP130/RM -ZSE
- Report
- a routine report filed through YKM
- Where
- 50 nm west (270°) of YKM
- Time
- 00:42 UTC
- Height
- at 13,000 ft
- Aircraft
- PC12
- Sky
- TOP130
- Remarks
- zse
- UAL1112 at 37,000 ft, 13 nm northwest, 5:25 pm PDT (00:25 UTC): -47 °C, wind 220° at 15 knots. 1679 nm along the route, 13 nm northwest of the line.
as filed, and in English
ARP UAL1112 2831N 14849W 0025 F370 MS47 220/015KT
- Report
- a routine report filed through ARP
- UAL1947 at 32,000 ft, 28 nm northwest, 6:07 pm PDT (01:07 UTC): -34 °C, wind 150° at 23 knots. 2059 nm along the route, 28 nm northwest of the line.
as filed, and in English
ARP UAL1947 2347N 15322W 0107 F320 MS34 150/023KT
- Report
- a routine report filed through ARP
- UAL2080 at 33,000 ft, 28 nm northwest, 5:34 pm PDT (00:34 UTC): -35 °C, wind 160° at 15 knots. 2059 nm along the route, 28 nm northwest of the line.
as filed, and in English
ARP UAL2080 2347N 15322W 0034 F330 MS35 160/015KT
- Report
- a routine report filed through ARP
- UAL1296 at 36,000 ft, 28 nm northwest, 4:50 pm PDT (23:50 UTC): -44 °C, wind 180° at 20 knots. 2059 nm along the route, 28 nm northwest of the line.
as filed, and in English
ARP UAL1296 2347N 15322W 2350 F360 MS44 180/020KT
- Report
- a routine report filed through ARP
- UAL2623 at 36,000 ft, 35 nm southeast, 6:18 pm PDT (01:18 UTC): -44 °C, wind 170° at 10 knots. 2069 nm along the route, 35 nm southeast of the line.
as filed, and in English
ARP UAL2623 2301N 15235W 0118 F360 MS44 170/010KT
- Report
- a routine report filed through ARP
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 4 forecast points nearest it (SEA, AST, OTH, FOT). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 4,500 ft | 030° at 13 kt | −13 kt | 133 kt | 17 h 35 min | 10:20 am HST (20:20 UTC) | |
| 6,500 ft | 020° at 12 kt | −11 kt | 3 °C | 131 kt | 17 h 51 min | 10:36 am HST (20:36 UTC) |
| 8,500 ft | 020° at 20 kt | −19 kt | 0 °C | 139 kt | 16 h 50 min | 9:35 am HST (19:35 UTC) |
| 10,500 ft | 020° at 30 kt | −26 kt | -3 °C | 146 kt | 16 h 01 min | 8:46 am HST (18:46 UTC) |
| 12,500 ft | 010° at 41 kt | −33 kt | -5 °C | 153 kt | 15 h 17 min | 8:02 am HST (18:02 UTC) |
| 14,500 ft | 010° at 51 kt | −40 kt | -8 °C | 160 kt | 14 h 37 min | 7:22 am HST (17:22 UTC) |
| 16,500 ft | 360° at 62 kt | −46 kt | -10 °C | 166 kt | 14 h 05 min | 6:50 am HST (16:50 UTC) |
| 18,000 ft FL180 | 360° at 70 kt | −50 kt | -12 °C | 170 kt | 13 h 46 min | 6:31 am HST (16:31 UTC) |
| 24,000 ft FL240 | 360° at 79 kt | −57 kt | -23 °C | 177 kt | 13 h 13 min | 5:58 am HST (15:58 UTC) |
| 30,000 ft FL300 | 360° at 87 kt | −59 kt | -39 °C | 179 kt | 13 h 04 min | 5:49 am HST (15:49 UTC) |
| 34,000 ft FL340 | 360° at 55 kt | −37 kt | -45 °C | 157 kt | 14 h 54 min | 7:39 am HST (17:39 UTC) |
| 39,000 ft FL390 | 330° at 30 kt | −7 kt | -43 °C | 127 kt | 18 h 25 min | 11:10 am HST (21:10 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; 22 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° |
| AST | used from 50 nm out; 40 nm from the line | 040/7 | 010/8 1° | 020/19 -4° | 020/36 -5° | 010/61 -14° | 360/67 -25° | 350/77 -40° | 350/66 -48° | 330/25 -44° |
| OTH | used from 250 nm out; 171 nm from the line | 040/15 | 040/14 1° | 030/25 -4° | 010/42 -6° | 360/74 -13° | 360/79 -24° | 350/92 -39° | 350/64 -46° | 310/32 -45° |
| FOT | used from 600 nm out; 440 nm from the line | 040/18 | 020/10 5° | 020/22 0° | 010/38 -3° | 360/70 -12° | 360/81 -23° | 360/88 -39° | 360/52 -44° | 330/31 -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 |
|---|---|---|---|---|---|---|---|
| BFI Seattle, WA | departure | VFR Sky: a few clouds at 6,000 feet | calm | 10+ mi | none | 21 ft | 6:53 pm PDT (01:53 UTC) |
| TIW Tacoma, WA | 20 nm out, 7 nm southeast of the line, tower | VFR | from the north-northeast (020°) at 8 knots | 10+ mi | none | 294 ft | 01:53 UTC |
| MUE Kamuela, HI | 2309 nm out, 9 nm south of the line | no report just now | 2,671 ft | ||||
| KOA Kailua-Kona, HI | destination | VFR Sky: scattered clouds at 2,800 feet | from the west (260°) at 10 knots | 10+ mi | none | 50 ft | 4:23 pm HST (02:23 UTC) |
The highest airport on this list sits at 2,671 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At KOA when you get there the forecast at the estimated arrival, 5:49 am HST (15:49 UTC)
Wind light and variable, visibility more than 6 miles, a few clouds at 5,000 feet VFR
The whole forecast for KOA
- From Sun 2:00 pm HST (00:00 UTC): wind from the west-southwest at 10 knots, visibility more than 6 miles, showers nearby, scattered clouds at 4,500 feet
- From Sun 8:00 pm HST (06:00 UTC): wind light and variable, visibility more than 6 miles, a few clouds at 5,000 feet
- From Mon 10:00 am HST (20:00 UTC): wind from the west at 8 knots, visibility more than 6 miles, scattered clouds at 4,500 feet
The forecast for BFI, the departure
- From Sun 5:00 pm PDT (00:00 UTC): wind from the north-northwest at 8 knots, gusting to 18, visibility more than 6 miles, a few clouds at 5,000 feet
- From Sun 7:00 pm PDT (02:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
- From Mon 3:00 am PDT (10:00 UTC): wind light and variable, 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
- From Mon 12:00 pm PDT (19:00 UTC): wind from the west-southwest at 3 knots, visibility more than 6 miles, clear skies
- From Mon 2:00 pm PDT (21:00 UTC): wind from the west at 5 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 KOA 6:03 pm HST (04:03 UTC) (civil twilight ends 6:25 pm HST (04:25 UTC)). At 120 knots the arrival at KOA is before sunrise there (6:17 am HST (16:17 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, Ellison Onizuka Kona International AT Keahole.