Guam International to San Francisco International GUM → SFO
5,044 nautical miles (5,805 statute miles) northeast on a straight line, true course 053°, about 051° magnetic at the departure end (variation 2E). At 120 knots that is 38 h 30 min at the quickest height in today's winds (39,000 ft, a 11-knot tailwind), arriving about 3:15 pm PDT (22:15 UTC). Right now GUM is VFR, wind from the west (280°) at 6 knots; SFO is VFR, wind from the south (180°) at 15 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: 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, from 4:00 pm ChST (06:00 UTC). Over the last 170 nm of the route.
- AIRMET TANGO 2W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots), from 4:00 pm ChST (06:00 UTC). Over the route from 4874 to 4944 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 GUM.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
No pilot reports within 50 nautical miles of the line in the last three hours.
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 6 forecast points nearest it (AST, OTH, CAR, OTH, FOT, SFO). 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 11 kt | +9 kt | 111 kt | 45 h 26 min | 10:11 pm PDT (05:11 UTC) | |
| 5,500 ft | 030° at 10 kt | +7 kt | 113 kt | 44 h 38 min | 9:23 pm PDT (04:23 UTC) | |
| 7,500 ft | 030° at 16 kt | +10 kt | -1 °C | 110 kt | 45 h 51 min | 10:36 pm PDT (05:36 UTC) |
| 9,500 ft | 020° at 24 kt | +14 kt | -3 °C | 106 kt | 47 h 35 min | 12:20 am PDT (07:20 UTC) |
| 11,500 ft | 010° at 35 kt | +17 kt | -5 °C | 103 kt | 48 h 58 min | 1:43 am PDT (08:43 UTC) |
| 13,500 ft | 010° at 44 kt | +19 kt | -7 °C | 101 kt | 49 h 56 min | 2:41 am PDT (09:41 UTC) |
| 15,500 ft | 010° at 54 kt | +20 kt | -10 °C | 100 kt | 50 h 26 min | 3:11 am PDT (10:11 UTC) |
| 17,500 ft | 360° at 64 kt | +21 kt | -12 °C | 99 kt | 50 h 57 min | 3:42 am PDT (10:42 UTC) |
| 18,000 ft FL180 | 360° at 66 kt | +22 kt | -13 °C | 98 kt | 51 h 28 min | 4:13 am PDT (11:13 UTC) |
| 24,000 ft FL240 | 360° at 73 kt | +20 kt | -24 °C | 100 kt | 50 h 26 min | 3:11 am PDT (10:11 UTC) |
| 30,000 ft FL300 | 350° at 83 kt | +12 kt | -39 °C | 108 kt | 46 h 42 min | 11:27 pm PDT (06:27 UTC) |
| 34,000 ft FL340 | 350° at 60 kt | +10 kt | -46 °C | 110 kt | 45 h 51 min | 10:36 pm PDT (05:36 UTC) |
| 39,000 ft FL390 | 320° at 28 kt | −11 kt | -44 °C | 131 kt | 38 h 30 min | 3:15 pm PDT (22:15 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; 4852 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 1998 nm out; 2880 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° |
| CAR | used from 2247 nm out; 3152 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° |
| OTH | used from 2297 nm out; 2583 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 3895 nm out; 1019 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° |
| SFO | used from 4894 nm out; 125 nm from the line | 120/13 | 090/14 5° | 040/14 -1° | 350/17 -5° | 360/42 -14° | 360/64 -23° | 350/38 -32° | 300/19 -37° | 250/18 -44° |
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 Sky: a few clouds at 1,700 feet | from the west (280°) at 6 knots | 10+ mi | none | 305 ft | 4:54 pm ChST (06:54 UTC) |
| GRO Rota Island, MP | 50 nm out, 18 nm northwest of the line | VFR Sky: scattered clouds at 1,200 feet, a broken layer at 6,500 feet, a broken layer at 12,000 feet | from the west (280°) at 6 knots | 7 mi | 6,500 ft | 606 ft | 06:50 UTC |
| SFO San Francisco, CA | destination | VFR Sky: a few clouds at 2,000 feet | from the south (180°) at 15 knots | 10+ mi | none | 13 ft | 11:56 pm PDT (06:56 UTC) |
The highest airport on this list sits at 606 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At SFO when you get there the forecast at the estimated arrival, 3:15 pm PDT (22:15 UTC)
Wind from the west at 6 knots, visibility more than 6 miles, clear skies VFR
The whole forecast for SFO
- From Sun 11:00 pm PDT (06:00 UTC): wind from the south at 6 knots, visibility more than 6 miles, a few clouds at 2,000 feet
- From Mon 11:00 am PDT (18:00 UTC): wind from the northeast at 5 knots, visibility more than 6 miles, clear skies
- From Mon 3:00 pm PDT (22:00 UTC): wind from the west at 12 knots, visibility more than 6 miles, clear skies
- From Mon 8:00 pm PDT (03:00 UTC): wind from the west at 6 knots, visibility more than 6 miles, clear skies
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
- 6/2520 S. FINEGAYAN, GU 4 nm from the route, at the departure end · security · ZUA
- 6/4143 ANDERSEN AFB, GU, Monday, March 9, 2026 through Tuesday, March 9, 2027 Local on the route, at the departure end · security · until 9 March · ZUA
Daylight
Sunset at GUM 6:03 pm ChST (08:03 UTC), at SFO 6:35 pm PDT (01:35 UTC) (civil twilight ends 7:01 pm PDT (02:01 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, San Francisco International.