Guam International to Ellison Onizuka Kona International AT Keahole GUM → KOA
3,408 nautical miles (3,922 statute miles) east on a straight line, true course 075°, about 073° magnetic at the departure end (variation 2E). At 120 knots that is 25 h 04 min at the quickest height in today's winds (39,000 ft, a 16-knot tailwind), arriving about 8:57 pm HST (06:57 UTC), after sunset at the destination. Right now GUM is VFR, wind from the west-northwest (300°) at 7 knots; 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: 2 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
No SIGMET or AIRMET covers any part of this route right now.
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 GUM.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- C208 at 5,000 ft, 7 nm northeast, 3:11 pm ChST (05:11 UTC): light turbulence from 4,000 ft to 5,000 ft, clear from 5,000 ft to 60,000 ft. At the destination end, 7 nm northeast of the line.
as filed, and in English
KOA UA /OV KOA312009/TM 0511/FL050/TP C208/SK SKC/TB LGT 040-050
- Report
- a routine report filed through KOA
- Where
- 9 nm northwest (312°) of KOA
- Time
- 05:11 UTC
- Height
- at 5,000 ft
- Aircraft
- C208
- Sky
- clear
- Turbulence
- light from 4,000 ft to 5,000 ft
- C208 at 4,600 ft, 26 nm northeast, 2:56 pm ChST (04:56 UTC): no turbulence, haze. At the destination end, 26 nm northeast of the line.
as filed, and in English
KOA UA /OV MUE/TM 0456/FL046/TP C208/WX HZ 050/TB NEG
- Report
- a routine report filed through KOA
- Where
- over MUE
- Time
- 04:56 UTC
- Height
- at 4,600 ft
- Aircraft
- C208
- Weather
- haze, at 5,000 ft
- Turbulence
- none
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 5 forecast points nearest it (AST, OTH, FOT, CAR, 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 |
|---|---|---|---|---|---|---|
| 3,500 ft | 040° at 14 kt | +9 kt | 111 kt | 30 h 42 min | 2:35 am HST (12:35 UTC) | |
| 5,500 ft | 030° at 11 kt | +6 kt | 114 kt | 29 h 54 min | 1:47 am HST (11:47 UTC) | |
| 7,500 ft | 020° at 16 kt | +8 kt | 0 °C | 112 kt | 30 h 26 min | 2:19 am HST (12:19 UTC) |
| 9,500 ft | 020° at 24 kt | +11 kt | -2 °C | 109 kt | 31 h 16 min | 3:09 am HST (13:09 UTC) |
| 11,500 ft | 010° at 35 kt | +11 kt | -4 °C | 109 kt | 31 h 16 min | 3:09 am HST (13:09 UTC) |
| 13,500 ft | 010° at 45 kt | +11 kt | -6 °C | 109 kt | 31 h 16 min | 3:09 am HST (13:09 UTC) |
| 15,500 ft | 360° at 55 kt | +10 kt | -9 °C | 110 kt | 30 h 59 min | 2:52 am HST (12:52 UTC) |
| 17,500 ft | 360° at 66 kt | +9 kt | -12 °C | 111 kt | 30 h 42 min | 2:35 am HST (12:35 UTC) |
| 18,000 ft FL180 | 360° at 68 kt | +9 kt | -13 °C | 111 kt | 30 h 42 min | 2:35 am HST (12:35 UTC) |
| 24,000 ft FL240 | 360° at 77 kt | +8 kt | -24 °C | 112 kt | 30 h 26 min | 2:19 am HST (12:19 UTC) |
| 30,000 ft FL300 | 350° at 85 kt | +2 kt | -39 °C | 118 kt | 28 h 53 min | 12:46 am HST (10:46 UTC) |
| 34,000 ft FL340 | 350° at 56 kt | +1 kt | -45 °C | 119 kt | 28 h 38 min | 12:31 am HST (10:31 UTC) |
| 39,000 ft FL390 | 320° at 30 kt | −16 kt | -44 °C | 136 kt | 25 h 04 min | 8:57 pm HST (06:57 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| AST | used from 0 nm out; 4855 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 600 nm out; 4341 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 1499 nm out; 3565 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° |
| CAR | used from 2049 nm out; 3675 nm from the line | 270/44 | 290/31 10° | 290/23 4° | 280/23 -1° | 260/36 -13° | 270/50 -24° | 260/77 -37° | 250/93 -48° | 260/102 -56° |
| FOT | used from 2099 nm out; 3049 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 |
|---|---|---|---|---|---|---|---|
| GUM Tamuning, GU | departure | VFR | from the west-northwest (300°) at 7 knots | 10+ mi | none | 305 ft | 2:54 pm ChST (04:54 UTC) |
| KOA Kailua-Kona, HI | destination | VFR Sky: a few clouds at 2,900 feet, overcast at 5,500 feet | from the west (260°) at 10 knots | 10+ mi | 5,500 ft | 50 ft | 6:53 pm HST (04:53 UTC) |
The highest airport on this list sits at 305 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, 8:57 pm HST (06:57 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 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-southwest at 8 knots, visibility more than 6 miles, scattered clouds at 4,500 feet
- From Mon 7:00 pm HST (05:00 UTC): wind light and variable, visibility more than 6 miles, a few clouds at 5,000 feet
The forecast for GUM, the departure
- From Mon 4:00 pm ChST (06:00 UTC): wind from the west-northwest at 6 knots, visibility more than 6 miles, showers nearby, a few clouds at 1,600 feet, scattered clouds at 2,500 feet and more above
Temporary flight restrictions on the line or within 25 nm of it
- 6/4143 ANDERSEN AFB, GU, Monday, March 9, 2026 through Tuesday, March 9, 2027 Local 3 nm from the route, at the departure end · security · until 9 March · ZUA
- 6/2520 S. FINEGAYAN, GU 4 nm from the route, at the departure end · security · ZUA
Daylight
Sunset at GUM 6:03 pm ChST (08:03 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 after sunset there (6:03 pm HST (04:03 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: Guam International, Ellison Onizuka Kona International AT Keahole.