San Antonio International to Boeing Fld/King County International SAT → BFI
1,544 nautical miles (1,777 statute miles) northwest on a straight line, true course 321°, about 317° magnetic at the departure end (variation 4E). At 120 knots that is 12 h 21 min at the quickest height in today's winds (10,500 ft, a 5-knot tailwind), arriving about 7:33 am PDT (14:33 UTC). Right now SAT is VFR, wind from the south-southeast (150°) at 11 knots; BFI is VFR, wind calm. 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
- SIGMET 6W: thunderstorms (a convective SIGMET) up to 34,000 ft, moving from the southwest at 40 knots, until 10:55 pm CDT (03:55 UTC). Over the route from 448 to 697 nm out.
as issued
WSUS33 KKCI 120155 MKCW WST 120155 CONVECTIVE SIGMET 6W VALID UNTIL 0355Z CO NM FROM 50SSW DEN-30NNE TBE-50SSW CME-50E SJN-20NE DVC-50SSW DEN AREA TS MOV FROM 23040KT. TOPS TO FL340.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 438 to 976 nm out.
- AIRMET TANGO 2W: moderate turbulence above 18,000 ft from 35,000 ft to 45,000 ft. Over the route from 448 to 518 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 528 to 687 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 558 to 1225 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 588 to 857 nm out.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 767 to 1215 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 777 to 1374 nm out.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Near the route, 837 nm along the route.
- AIRMET SIERRA 2E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 876 to 926 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). Near the route, 1056 nm along the route.
- AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 1295 to 1434 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 149 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 SAT.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- urgent BCS3 at 5,400 ft, 46 nm southwest, 6:35 pm CDT (23:35 UTC): remarks: wind shear 10 knots gain 1000 above ground on final. 916 nm along the route, 46 nm southwest of the line.
as filed, and in English
PVU UUA /OV PVU310001/TM 2335/FL054/TP BCS3/RM WIND SHEAR 10 KT GAIN 1000 AGL ON FINAL
- Report
- an urgent report filed through PVU
- Where
- 1 nm northwest (310°) of PVU
- Time
- 23:35 UTC
- Height
- at 5,400 ft
- Aircraft
- BCS3
- Remarks
- wind shear 10 knots gain 1000 above ground on final
- UAL2238 at 38,000 ft, 27 nm northeast, 6:44 pm CDT (23:44 UTC): moderate turbulence, wind 244° at 64 knots. 657 nm along the route, 27 nm northeast of the line.
as filed, and in English
ARP UAL2238 3807N 10649W 2344 F380 244/064KT TB CONT MOD TURB IC
- Report
- a routine report filed through ARP
- GLF4 at 43,000 ft, 32 nm southwest, 7:09 pm CDT (00:09 UTC): moderate chop turbulence, remarks: ZDVWC-38. 667 nm along the route, 32 nm southwest of the line.
as filed, and in English
FMN UA /OV RSK360050/TM 0009/FL430/TP GLF4/TB MOD CHOP/RM ZDVWC-38
- Report
- a routine report filed through FMN
- Where
- 50 nm north (360°) of RSK
- Time
- 00:09 UTC
- Height
- at 43,000 ft
- Aircraft
- GLF4
- Turbulence
- moderate chop
- Remarks
- ZDVWC-38
- SW4 at 15,000 ft, 34 nm southwest, 8:39 pm CDT (01:39 UTC): moderate turbulence, light rime icing, freezing, rain, 0 °C, remarks: instrument conditions ZDVWC-36. 687 nm along the route, 34 nm southwest of the line.
as filed, and in English
CEZ UA /OV CEZ030030/TM 0139/FL150/TP SW4/SK BASE150/WX FZ RA/TA 00/TB CONS MOD/IC LGT RIME/RM IMC ZDVWC-36
- Report
- a routine report filed through CEZ
- Where
- 30 nm northeast (030°) of CEZ
- Time
- 01:39 UTC
- Height
- at 15,000 ft
- Aircraft
- SW4
- Sky
- BASE150
- Weather
- freezing, rain
- Temperature
- 0 °C
- Turbulence
- continuous moderate
- Icing
- light rime
- Remarks
- instrument conditions ZDVWC-36
- E170 at 10,000 ft, 9 nm north, 6:41 pm CDT (23:41 UTC): moderate turbulence up to 10,000 ft, remarks: during the climb. 747 nm along the route, 9 nm north of the line.
as filed, and in English
GJT UA /OV GJT144009/TM 2341/FL100/TP E170/TB MOD SFC-100/RM DURC
- Report
- a routine report filed through GJT
- Where
- 9 nm southeast (144°) of GJT
- Time
- 23:41 UTC
- Height
- at 10,000 ft
- Aircraft
- E170
- Turbulence
- moderate from the surface to 10,000 ft
- Remarks
- during the climb
- S22T at 14,000 ft, 29 nm southwest, 8:23 pm CDT (01:23 UTC): moderate rime icing, -16 °C. 867 nm along the route, 29 nm southwest of the line.
as filed, and in English
PUC UA /OV PUC360015/TM 0123/FL140/TP S22T/TA M16/IC MOD RIME /ZLC
- Report
- a routine report filed through PUC
- Where
- 15 nm north (360°) of PUC
- Time
- 01:23 UTC
- Height
- at 14,000 ft
- Aircraft
- S22T
- Temperature
- −16 °C
- Icing
- moderate rime zlc
- E75L at 22,000 ft, 35 nm southwest, 8:04 pm CDT (01:04 UTC): moderate turbulence. 876 nm along the route, 35 nm southwest of the line.
as filed, and in English
PUC UA /OV PUC320020/TM 0104/FL220/TP E75L/TB MOD /ZLC
- Report
- a routine report filed through PUC
- Where
- 20 nm northwest (320°) of PUC
- Time
- 01:04 UTC
- Height
- at 22,000 ft
- Aircraft
- E75L
- Turbulence
- moderate zlc
- PA44 at 6,000 ft, 45 nm southwest, 6:25 pm CDT (23:25 UTC): moderate turbulence, remarks: runway in sight at at 6,400 ft. 916 nm along the route, 45 nm southwest of the line.
as filed, and in English
PVU UA /OV PVU310002/TM 2325/FL060/TP PA44/TB MOD /RM RWY IN SIGHT AT 064
- Report
- a routine report filed through PVU
- Where
- 2 nm northwest (310°) of PVU
- Time
- 23:25 UTC
- Height
- at 6,000 ft
- Aircraft
- PA44
- Turbulence
- moderate
- Remarks
- runway in sight at at 6,400 ft
- A339 at 16,000 ft, 4 nm west, 6:35 pm CDT (23:35 UTC): moderate chop turbulence up to 16,000 ft, remarks: during the climb zlc. 956 nm along the route, 4 nm west of the line.
as filed, and in English
OGD UA /OV OGD063012/TM 2335/FL160/TP A339/TB MOD CHOP 160 BLO/RM DURC /ZLC
- Report
- a routine report filed through OGD
- Where
- 12 nm northeast (063°) of OGD
- Time
- 23:35 UTC
- Height
- at 16,000 ft
- Aircraft
- A339
- Turbulence
- moderate chop at 16,000 ft below
- Remarks
- during the climb zlc
- E145 at 7,400 ft, 31 nm northeast, 7:15 pm CDT (00:15 UTC): remarks: base reported below minimums 1/2 miles visibility ZDVWC-41. 598 nm along the route, 31 nm northeast of the line.
as filed, and in English
ALS UA /OV KALS/TM 0015/FL074/TP E145/RM BASE REPORTED BELOW MINIMUMS 1/2 SM VIS ZDVWC-41
- Report
- a routine report filed through ALS
- Where
- over KALS
- Time
- 00:15 UTC
- Height
- at 7,400 ft
- Aircraft
- E145
- Remarks
- base reported below minimums 1/2 miles visibility ZDVWC-41
- E145 at 7,400 ft, 29 nm northeast, 7:15 pm CDT (00:15 UTC): remarks: reported below minimums visibility 1/2SM ZDVWC-41. 598 nm along the route, 29 nm northeast of the line.
as filed, and in English
ALS UA /OV ALS/TM 0015/FL074/TP E145/SK VASE UNKN/RM REPORTED BLO MINIMUMS VIS 1/2SM ZDVWC-41
- Report
- a routine report filed through ALS
- Where
- over ALS
- Time
- 00:15 UTC
- Height
- at 7,400 ft
- Aircraft
- E145
- Sky
- vase unknown
- Remarks
- reported below minimums visibility 1/2SM ZDVWC-41
- BE9L at 20,000 ft, 45 nm northeast, 7:34 pm CDT (00:34 UTC): light rime icing, -9 °C, remarks: ZDVWC-41. 627 nm along the route, 45 nm northeast of the line.
as filed, and in English
ALS UA /OV ALS330035/TM 0034/FL200/TP BE9L/TA M09/IC LGT RIME/RM ZDVWC-41
- Report
- a routine report filed through ALS
- Where
- 35 nm northwest (330°) of ALS
- Time
- 00:34 UTC
- Height
- at 20,000 ft
- Aircraft
- BE9L
- Temperature
- −9 °C
- Icing
- light rime
- Remarks
- ZDVWC-41
- PRM1 at 41,000 ft, 21 nm northeast, 6:38 pm CDT (23:38 UTC): light to moderate clear-air turbulence, remarks: ZDVWC-46. 627 nm along the route, 21 nm northeast of the line.
as filed, and in English
ALS UA /OV ALS290035/TM 2338/FL410/TP PRM1/TB LGT-MOD CAT/RM ZDVWC-46
- Report
- a routine report filed through ALS
- Where
- 35 nm west (290°) of ALS
- Time
- 23:38 UTC
- Height
- at 41,000 ft
- Aircraft
- PRM1
- Turbulence
- light to moderate clear-air turbulence
- Remarks
- ZDVWC-46
- BE9L at 20,000 ft, 46 nm southwest, 7:59 pm CDT (00:59 UTC): light chop turbulence, remarks: instrument conditions ZDVWC-36. 647 nm along the route, 46 nm southwest of the line.
as filed, and in English
DRO UA /OV DRO/TM 0059/FL200/TP BE9L/TB LGT CHOP/RM IMC ZDVWC-36
- Report
- a routine report filed through DRO
- Where
- over DRO
- Time
- 00:59 UTC
- Height
- at 20,000 ft
- Aircraft
- BE9L
- Turbulence
- light chop
- Remarks
- instrument conditions ZDVWC-36
14 more routine reports are on the map.
Winds aloft along the route, and the time en route the forecast for use 20:00–03:00 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 12 forecast points nearest it (SAT, ABI, LBB, TCC, ALS, GJT, SLC, PIH, 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 |
|---|---|---|---|---|---|---|
| 4,500 ft | 200° at 5 kt | −3 kt | 12 °C | 123 kt | 12 h 33 min | 7:45 am PDT (14:45 UTC) |
| 6,500 ft | 200° at 6 kt | −3 kt | 8 °C | 123 kt | 12 h 33 min | 7:45 am PDT (14:45 UTC) |
| 8,500 ft | 210° at 13 kt | −4 kt | 5 °C | 124 kt | 12 h 27 min | 7:39 am PDT (14:39 UTC) |
| 10,500 ft | 210° at 19 kt | −5 kt | 3 °C | 125 kt | 12 h 21 min | 7:33 am PDT (14:33 UTC) |
| 12,500 ft | 220° at 22 kt | −4 kt | -1 °C | 124 kt | 12 h 27 min | 7:39 am PDT (14:39 UTC) |
| 14,500 ft | 220° at 24 kt | −4 kt | -5 °C | 124 kt | 12 h 27 min | 7:39 am PDT (14:39 UTC) |
| 16,500 ft | 220° at 26 kt | −4 kt | -9 °C | 124 kt | 12 h 27 min | 7:39 am PDT (14:39 UTC) |
| 18,000 ft FL180 | 220° at 28 kt | −3 kt | -12 °C | 123 kt | 12 h 33 min | 7:45 am PDT (14:45 UTC) |
| 24,000 ft FL240 | 220° at 30 kt | −2 kt | -21 °C | 122 kt | 12 h 39 min | 7:51 am PDT (14:51 UTC) |
| 30,000 ft FL300 | 230° at 41 kt | +3 kt | -31 °C | 117 kt | 13 h 12 min | 8:24 am PDT (15:24 UTC) |
| 34,000 ft FL340 | 240° at 46 kt | +10 kt | -37 °C | 110 kt | 14 h 02 min | 9:14 am PDT (16:14 UTC) |
| 39,000 ft FL390 | 240° at 45 kt | +14 kt | -46 °C | 106 kt | 14 h 34 min | 9:46 am PDT (16:46 UTC) |
Based on data from the 11th at 18:00 UTC; valid on the 12th at 00:00 UTC for use 20:00 to 03:00 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SAT | used from 0 nm out; 25 nm from the line | 130/22 | 140/24 18° | 170/19 13° | 190/13 7° | 240/15 -4° | 220/14 -13° | 270/11 -28° | 280/10 -40° | 310/18 -51° |
| ABI | used from 100 nm out; 78 nm from the line | 180/26 17° | 220/18 12° | 230/25 8° | 230/28 -5° | 240/29 -14° | 250/35 -28° | 270/37 -39° | 280/37 -51° | |
| LBB | used from 249 nm out; 38 nm from the line | 180/26 20° | 210/21 13° | 230/21 7° | 250/25 -5° | 250/34 -16° | 250/52 -28° | 260/47 -38° | 260/49 -50° | |
| TCC | used from 349 nm out; 57 nm from the line | 200/26 | 200/28 14° | 220/25 7° | 230/28 -7° | 240/41 -19° | 240/62 -28° | 250/61 -37° | 250/49 -49° | |
| ALS | used from 498 nm out; 84 nm from the line | 210/32 5° | 230/48 -8° | 230/49 -20° | 230/78 -30° | 240/74 -36° | 240/61 -47° | |||
| GJT | used from 697 nm out; 40 nm from the line | 210/40 11° | 210/46 3° | 210/61 -10° | 210/68 -22° | 220/57 -29° | 230/59 -36° | 240/66 -46° | ||
| SLC | used from 847 nm out; 78 nm from the line | 280/8 | 210/39 5° | 210/52 -1° | 200/50 -11° | 200/56 -23° | 220/61 -28° | 230/73 -37° | 230/73 -45° | |
| PIH | used from 996 nm out; 55 nm from the line | 270/10 | 270/13 1° | 210/16 -2° | 200/56 -11° | 200/51 -23° | 200/68 -33° | 220/77 -37° | 230/73 -44° | |
| BOI | used from 1096 nm out; 81 nm from the line | 330/14 4° | 230/5 -2° | 220/20 -7° | 210/37 -20° | 200/59 -26° | 200/67 -34° | 210/73 -35° | 220/62 -41° | |
| LWS | used from 1295 nm out; 79 nm from the line | 010/5 | 050/14 -2° | 040/12 -6° | 160/7 -10° | 190/30 -22° | 200/54 -27° | 200/48 -35° | 210/40 -37° | 230/32 -41° |
| YKM | used from 1345 nm out; 82 nm from the line | 030/16 | 020/18 0° | 030/30 -8° | 030/23 -13° | 020/40 -23° | 010/73 -29° | 010/54 -36° | 360/29 -37° | 330/16 -40° |
| SEA | used from 1494 nm out; 23 nm from the line | 360/9 | 350/10 1° | 010/10 -5° | 030/20 -11° | 020/60 -17° | 010/86 -26° | 360/90 -40° | 010/68 -42° | 360/31 -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 |
|---|---|---|---|---|---|---|---|
| SAT San Antonio, TX | departure | VFR Sky: a few clouds at 20,000 feet | from the south-southeast (150°) at 11 knots | 10+ mi | none | 809 ft | 7:51 pm CDT (00:51 UTC) |
| SJT San Angelo, TX | 149 nm out, 12 nm southwest of the line, tower | VFR | from the south (170°) at 9 knots | 10+ mi | none | 1,918 ft | 01:51 UTC |
| BFE Brownfield, TX | 289 nm out, 6 nm southwest of the line | no report just now | 3,264 ft | ||||
| LLN Levelland, TX | 309 nm out, 5 nm north of the line | VFR | from the south-southeast (160°) at 9 knots, gusting to 15 | 10+ mi | none | 3,514 ft | 01:55 UTC |
| SKX Taos, NM | 548 nm out, 4 nm west of the line | no report just now | 7,094 ft | ||||
| GJT Grand Junction, CO | 757 nm out, 11 nm northeast of the line, tower | VFR | from the southwest (220°) at 7 knots, gusting to 20 | 10+ mi | none | 4,861 ft | 01:53 UTC |
| HCR Heber, UT | 916 nm out, 25 nm southwest of the line | VFR Sky: a broken layer at 5,500 feet, overcast at 7,500 feet Weather: light rain | from the south-southwest (210°) at 12 knots, gusting to 17 | 8 mi | 5,500 ft | 5,636 ft | 23:35 UTC |
| OGD Ogden, UT | 966 nm out, 12 nm southwest of the line, tower | VFR Sky: overcast at 8,000 feet Weather: light rain | from the south (180°) at 6 knots | 10+ mi | 8,000 ft | 4,472 ft | 01:53 UTC |
| SUN Hailey, ID | 1125 nm out, 23 nm northeast of the line, tower | marginal VFR Sky: a broken layer at 1,700 feet, overcast at 2,200 feet | calm | 10+ mi | 1,700 ft | 5,319 ft | 01:50 UTC |
| PDT Pendleton, OR | 1365 nm out, 2 nm south of the line, tower | VFR Sky: overcast at 7,000 feet | calm | 10+ mi | 7,000 ft | 1,494 ft | 01:53 UTC |
| YKM Yakima, WA | 1454 nm out, 4 nm south of the line, tower | VFR Sky: overcast at 9,500 feet | from the west-northwest (290°) at 6 knots | 10+ mi | 9,500 ft | 1,098 ft | 01:53 UTC |
| BFI Seattle, WA | destination | VFR Sky: a few clouds at 6,000 feet | calm | 10+ mi | none | 21 ft | 6:53 pm PDT (01:53 UTC) |
The highest airport on this list sits at 7,094 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, 7:33 am PDT (14:33 UTC)
Wind light and variable, visibility more than 6 miles, patches of fog, clear skies VFR
The whole forecast for BFI
- 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
The forecast for SAT, the departure
- From Sun 7:00 pm CDT (00:00 UTC): wind from the south-southeast at 15 knots, visibility more than 6 miles, a few clouds at 6,000 feet, scattered clouds at 25,000 feet
- From Mon 12:00 am CDT (05:00 UTC): wind from the southeast at 9 knots, visibility more than 6 miles, scattered clouds at 1,200 feet
- From Mon 6:00 am CDT (11:00 UTC): wind from the east-southeast at 5 knots, visibility more than 6 miles, a broken layer at 1,200 feet
- From Mon 12:00 pm CDT (17:00 UTC): wind from the south-southeast at 8 knots, visibility more than 6 miles, a broken layer at 2,500 feet
- From Mon 2:00 pm CDT (19:00 UTC): wind from the south at 11 knots, visibility more than 6 miles, a broken layer at 5,000 feet
Temporary flight restrictions on the line or within 25 nm of it
- 6/4240 SAN ANGELO, TX, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local 6 nm from the route, 139 nm along the route · security · until 1 November · ZFW
Daylight
Sunset at SAT 7:06 pm CDT (00:06 UTC), at BFI 6:27 pm PDT (01:27 UTC) (civil twilight ends 6:58 pm PDT (01:58 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: San Antonio International, Boeing Fld/King County International.