Plan a flight · Sun 6:33 pm PDT (01:33 UTC)

Boeing Fld/King County International to William P Hobby Airport BFI → HOU

1,647 nautical miles (1,895 statute miles) southeast on a straight line, true course 121°, about 106° magnetic at the departure end (variation 15E). At 120 knots that is 11 h 46 min at the quickest height in today's winds (39,000 ft, a 20-knot tailwind), arriving about 8:19 am CDT (13:19 UTC). Right now BFI is VFR, wind from the northwest (310°) at 6 knots; HOU is VFR, wind from the southeast (140°) at 7 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

SIGMET 1W: thunderstorms (a convective SIGMET) up to 34,000 ft, moving from the southwest at 40 knots, until 7:55 pm PDT (02:55 UTC). Over the route from 729 to 988 nm out.

as issued

WSUS33 KKCI 120055
MKCW WST 120055
CONVECTIVE SIGMET 1W
VALID UNTIL 0255Z
CO NM WY AZ UT
FROM 40NNW CHE-40WNW TBE-60WNW CME-40N SJN-40ESE MTU-40NNW CHE
AREA SEV TS MOV FROM 23040KT. TOPS TO FL340.
WIND GUSTS TO 60KT POSS.

AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 25,000 ft to 39,000 ft, from 5:00 pm PDT (00:00 UTC). Over the first 0 nm of the route.
AIRMET ZULU 2C: moderate icing up to 14,000 ft, from 5:00 pm PDT (00:00 UTC). Over the route from 120 to 299 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist), from 5:00 pm PDT (00:00 UTC). Over the route from 170 to 868 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft, from 5:00 pm PDT (00:00 UTC). Over the route from 269 to 938 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), from 5:00 pm PDT (00:00 UTC). Over the route from 359 to 549 nm out.
AIRMET ZULU 3C: moderate icing up to 22,000 ft, from 5:00 pm PDT (00:00 UTC). Over the route from 369 to 679 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft, from 5:00 pm PDT (00:00 UTC). Over the route from 519 to 1028 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), from 5:00 pm PDT (00:00 UTC). Over the route from 549 to 848 nm out.
AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots), from 5:00 pm PDT (00:00 UTC). Over the route from 709 to 758 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 BFI.

Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first

A21N at 33,000 ft, 45 nm northeast, 3:35 pm PDT (22:35 UTC): moderate turbulence, remarks: mountain wave +25-30KTS. 768 nm along the route, 45 nm northeast of the line.
as filed, and in English
```
HDN UA /OV CHE/TM 2235/FL330/TP A21N/TB MOD/RM MTN WAVE +25-30KTS
```
Report
a routine report filed through HDN
Where
over CHE
Time
22:35 UTC
Height
at 33,000 ft
Aircraft
A21N
Turbulence
moderate
Remarks
mountain wave +25-30KTS
C650 at 40,000 ft, 9 nm northeast, 4:48 pm PDT (23:48 UTC): moderate turbulence, remarks: ZDVWC-03. 828 nm along the route, 9 nm northeast of the line.
as filed, and in English
```
ASE UA /OV DBL/TM 2348/FL400/TP C650/TB MOD /RM ZDVWC-03
```
Report
a routine report filed through ASE
Where
over DBL
Time
23:48 UTC
Height
at 40,000 ft
Aircraft
C650
Turbulence
moderate
Remarks
ZDVWC-03
C680 at 18,000 ft, 19 nm southwest, 3:35 pm PDT (22:35 UTC): moderate turbulence, remarks: from 18,000 ft to 10,000 ft. 828 nm along the route, 19 nm southwest of the line.
as filed, and in English
```
ASE UA /OV ASE230020/TM 2235/FL180/TP C680/TB MOD/RM 180-100
```
Report
a routine report filed through ASE
Where
20 nm southwest (230°) of ASE
Time
22:35 UTC
Height
at 18,000 ft
Aircraft
C680
Turbulence
moderate
Remarks
from 18,000 ft to 10,000 ft
C680A at 16,000 ft, 3 nm northwest, 3:59 pm PDT (22:59 UTC): moderate turbulence, scattered clouds above 16,000 ft, remarks: during the descent. 838 nm along the route, 3 nm northwest of the line.
as filed, and in English
```
ASE UA /OV HAERI/TM 2259/FL160/TP C680A/SK SCT160/TB CONS MOD/RM DURD
```
Report
a routine report filed through ASE
Where
haeri
Time
22:59 UTC
Height
at 16,000 ft
Aircraft
C680A
Sky
scattered clouds from 16,000 ft
Turbulence
continuous moderate
Remarks
during the descent
UAL2238 at 38,000 ft, 48 nm southwest, 4:44 pm PDT (23:44 UTC): moderate turbulence, wind 244° at 64 knots. 878 nm along the route, 48 nm southwest 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
PC12 at 13,000 ft, 19 nm southwest, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 19 nm southwest 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
PC12 at 15,000 ft, 19 nm southwest, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 19 nm southwest 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
C337 at 12,000 ft, 25 nm southwest, 6:18 pm PDT (01:18 UTC): light rime icing, -12 °C, remarks: zse. 110 nm along the route, 25 nm southwest of the line.
as filed, and in English
```
YKM UA /OV YKM155020/TM 0118/FL120/TP C337/TA M12/IC LGT RIME/RM ZSE
```
Report
a routine report filed through YKM
Where
20 nm southeast (155°) of YKM
Time
01:18 UTC
Height
at 12,000 ft
Aircraft
C337
Temperature
−12 °C
Icing
light rime
Remarks
zse
PC12 at 13,500 ft, 29 nm northeast, 6:08 pm PDT (01:08 UTC): no turbulence, a trace of icing, overcast from 9,000 ft to 13,500 ft, -10 °C. 140 nm along the route, 29 nm northeast of the line.
as filed, and in English
```
PSC UA /OV PSC360025/TM 0108/FL135/TP PC12/SK OVC090-TOP135/TA M10/TB NEG /IC TRACE RM 135-090
```
Report
a routine report filed through PSC
Where
25 nm north (360°) of PSC
Time
01:08 UTC
Height
at 13,500 ft
Aircraft
PC12
Sky
overcast from 9,000 ft, tops 13,500 ft
Temperature
−10 °C
Turbulence
none
Icing
trace remarks from 13,500 ft to 9,000 ft
PC12 at 6,000 ft, 4 nm northwest, 5:56 pm PDT (00:56 UTC): overcast above 6,000 ft. 190 nm along the route, 4 nm northwest of the line.
as filed, and in English
```
ALW UA /OV ALW200015/TM 0056/FL060/TP PC12/SK OVC060
```
Report
a routine report filed through ALW
Where
15 nm south (200°) of ALW
Time
00:56 UTC
Height
at 6,000 ft
Aircraft
PC12
Sky
overcast from 6,000 ft
PC12 at 6,000 ft, 14 nm south, 6:09 pm PDT (01:09 UTC): scattered clouds up to 6,000 ft, remarks: multiple scattered layers during the descent RY31. 409 nm along the route, 14 nm south of the line.
as filed, and in English
```
SUN UA /OV KSUN/TM 0109/FL060/TP PC12/SK SCT-TOP060/WX FV05SM/RM MULTIPLE SCT LAYERS DURD RY31
```
Report
a routine report filed through SUN
Where
over KSUN
Time
01:09 UTC
Height
at 6,000 ft
Aircraft
PC12
Sky
scattered clouds, tops 6,000 ft
Weather
flight visibility 5 miles
Remarks
multiple scattered layers during the descent RY31
E550 at 21,000 ft, 14 nm south, 4:27 pm PDT (23:27 UTC): light turbulence, a few clouds above 7,000 ft, remarks: during the climb zlc. 409 nm along the route, 14 nm south of the line.
as filed, and in English
```
SUN UA /OV SUN/TM 2327/FL210/TP E550/SK FEW070/TB CONS LGT/RM DURC /ZLC
```
Report
a routine report filed through SUN
Where
over SUN
Time
23:27 UTC
Height
at 21,000 ft
Aircraft
E550
Sky
a few clouds from 7,000 ft
Turbulence
continuous light
Remarks
during the climb zlc
UAL2395 at 37,000 ft, 43 nm northeast, 5:58 pm PDT (00:58 UTC): no turbulence, wind 240° at 70 knots. 669 nm along the route, 43 nm northeast of the line.
as filed, and in English
```
ARP UAL2395 4135N 10900W 0058 F370 240/070KT TB NONE SK CLEAR IC NONE
```
Report
a routine report filed through ARP
UAL1791 at 31,000 ft, 5 nm south, 3:40 pm PDT (22:40 UTC): light turbulence, -34 °C, wind 224° at 52 knots. 758 nm along the route, 5 nm south of the line.
as filed, and in English
```
ARP UAL1791 3959N 10807W 2240 F310 MS34 224/052KT TB LIGHT SK CLEAR IC NONE
```
Report
a routine report filed through ARP

15 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 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 17 forecast points nearest it (SEA, YKM, LWS, BOI, PIH, RKS, GJT, ALS, PUB, TCC, AMA, LBB, SPS, ABI, DAL, CLL, HOU). 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	190° at 8 kt	+5 kt	12 °C	115 kt	14 h 19 min	10:52 am CDT (15:52 UTC)
7,500 ft	200° at 14 kt	+5 kt	8 °C	115 kt	14 h 19 min	10:52 am CDT (15:52 UTC)
9,500 ft	210° at 15 kt	+3 kt	5 °C	117 kt	14 h 05 min	10:38 am CDT (15:38 UTC)
11,500 ft	210° at 20 kt	+3 kt	2 °C	117 kt	14 h 05 min	10:38 am CDT (15:38 UTC)
13,500 ft	220° at 23 kt	+3 kt	-2 °C	117 kt	14 h 05 min	10:38 am CDT (15:38 UTC)
15,500 ft	220° at 26 kt	+2 kt	-6 °C	118 kt	13 h 57 min	10:30 am CDT (15:30 UTC)
17,500 ft	220° at 28 kt	+1 kt	-10 °C	119 kt	13 h 50 min	10:23 am CDT (15:23 UTC)
18,000 ft FL180	220° at 29 kt	+1 kt	-11 °C	119 kt	13 h 50 min	10:23 am CDT (15:23 UTC)
24,000 ft FL240	220° at 31 kt	−2 kt	-21 °C	122 kt	13 h 30 min	10:03 am CDT (15:03 UTC)
30,000 ft FL300	230° at 39 kt	−7 kt	-31 °C	127 kt	12 h 58 min	9:31 am CDT (14:31 UTC)
34,000 ft FL340	240° at 45 kt	−15 kt	-37 °C	135 kt	12 h 12 min	8:45 am CDT (13:45 UTC)
39,000 ft FL390	250° at 44 kt	−20 kt	-46 °C	140 kt	11 h 46 min	8:19 am CDT (13:19 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
SEA	used from 0 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°
YKM	used from 50 nm out; 20 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°
LWS	used from 150 nm out; 75 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°
BOI	used from 299 nm out; 62 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°
PIH	used from 399 nm out; 71 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°
RKS	used from 599 nm out; 60 nm from the line			190/43	210/65 3°	210/57 -9°	210/56 -21°	210/47 -33°	230/63 -37°	240/77 -46°
GJT	used from 748 nm out; 56 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°
ALS	used from 848 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°
PUB	used from 898 nm out; 46 nm from the line			210/24 16°	210/28 8°	230/43 -8°	240/42 -21°	240/77 -30°	240/72 -36°	250/51 -47°
TCC	used from 1048 nm out; 84 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°
AMA	used from 1098 nm out; 58 nm from the line		190/28	220/26 14°	230/27 7°	250/24 -6°	250/32 -16°	240/51 -28°	250/52 -38°	250/51 -50°
LBB	used from 1247 nm out; 83 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°
SPS	used from 1297 nm out; 60 nm from the line	180/26	200/25 16°	220/19 13°	220/20 9°	230/26 -5°	230/34 -15°	260/37 -28°	270/42 -39°	280/40 -51°
ABI	used from 1347 nm out; 53 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°
DAL	used from 1447 nm out; 73 nm from the line	180/21	190/24 15°	230/20 12°	220/23 8°	240/22 -5°	230/18 -15°	280/33 -29°	280/36 -39°	300/33 -52°
CLL	used from 1497 nm out; 45 nm from the line	160/18	190/18 16°	200/19 12°	220/14 7°	260/18 -5°	250/20 -13°	290/29 -29°	290/31 -40°	300/22 -53°
HOU	used from 1597 nm out; 25 nm from the line	160/18	160/14 17°	180/19 12°	190/11 8°	260/12 -4°	260/14 -13°	310/26 -30°	310/30 -40°	320/21 -52°

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	from the northwest (310°) at 6 knots	10+ mi	none	21 ft	5:53 pm PDT (00:53 UTC)
PSC Pasco, WA	150 nm out, 5 nm northeast of the line, tower	VFR Sky: overcast at 9,500 feet	from the northeast (040°) at 11 knots	10+ mi	9,500 ft	410 ft	00:53 UTC
ALW Walla Walla, WA	190 nm out, 16 nm north of the line, tower	VFR Sky: overcast at 5,000 feet	from the south-southwest (210°) at 3 knots	10+ mi	5,000 ft	1,194 ft	00:53 UTC
SUN Hailey, ID	409 nm out, 14 nm south of the line, tower	marginal VFR Sky: scattered clouds at 300 feet, overcast at 1,500 feet Weather: light rain	calm	5 mi	1,500 ft	5,319 ft	01:24 UTC
PIH Pocatello, ID	499 nm out, 6 nm north of the line, tower	VFR Sky: scattered clouds at 1,200 feet, a broken layer at 6,000 feet, overcast at 8,500 feet Weather: light rain	from the southwest (230°) at 9 knots	10+ mi	6,000 ft	4,451 ft	00:53 UTC
EGE Eagle, CO	818 nm out, 17 nm northeast of the line, tower	VFR Sky: scattered clouds at 9,000 feet, a broken layer at 11,000 feet	from the southwest (220°) at 6 knots	10+ mi	11,000 ft	6,547 ft	00:56 UTC
ASE Aspen, CO	838 nm out, 3 nm northwest of the line, tower	VFR Sky: a broken layer at 7,500 feet, overcast at 9,000 feet Weather: light rain	from the west-northwest (300°) at 12 knots, gusting to 15	10+ mi	7,500 ft	7,837 ft	00:53 UTC
DHT Dalhart, TX	1118 nm out, 1 nm west of the line	VFR	from the south (180°) at 15 knots	10+ mi	none	3,991 ft	00:53 UTC
AMA Amarillo, TX	1178 nm out, 7 nm southwest of the line, tower	VFR	from the south (170°) at 14 knots	10+ mi	none	3,606 ft	00:53 UTC
SEP Stephenville, TX	1427 nm out, 8 nm south of the line	VFR Sky: scattered clouds at 10,000 feet, scattered clouds at 12,000 feet	from the south-southeast (150°) at 4 knots	10+ mi	none	1,321 ft	01:15 UTC
CLL College Station, TX	1567 nm out, 4 nm southwest of the line, tower	VFR	from the southeast (130°) at 7 knots	10+ mi	none	320 ft	00:53 UTC
HOU Houston, TX	destination	VFR Sky: scattered clouds at 25,000 feet	from the southeast (140°) at 7 knots	10+ mi	none	46 ft	7:53 pm CDT (00:53 UTC)

The highest airport on this list sits at 7,837 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At HOU when you get there the forecast at the estimated arrival, 8:19 am CDT (13:19 UTC)

Wind from the east-southeast at 5 knots, visibility more than 6 miles, scattered clouds at 2,500 feet, scattered clouds at 25,000 feet VFR

The whole forecast for HOU

From Sun 7:00 pm CDT (00:00 UTC): wind from the southeast at 12 knots, visibility more than 6 miles, a few clouds at 25,000 feet
From Sun 8:00 pm CDT (01:00 UTC): wind from the southeast at 7 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
From Mon 4:00 am CDT (09:00 UTC): wind from the east-southeast at 5 knots, visibility more than 6 miles, scattered clouds at 2,500 feet, scattered clouds at 25,000 feet
From Mon 11:00 am CDT (16:00 UTC): wind from the southeast at 11 knots, visibility more than 6 miles, scattered clouds at 3,500 feet, a broken layer at 25,000 feet
30% chance between Mon 11:00 am CDT (16:00 UTC) and 1:00 pm CDT (18:00 UTC): light rain showers
From Mon 5:00 pm CDT (22:00 UTC): wind from the southeast at 13 knots, visibility more than 6 miles, overcast at 5,000 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

6/0543 MCGREGOR, TX 12 nm from the route, 1497 nm along the route · security · ZFW

Daylight

Sunset at BFI 6:27 pm PDT (01:27 UTC), at HOU 6:54 pm CDT (23:54 UTC) (civil twilight ends 7:18 pm CDT (00:18 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

Radar now, the Pacific Northwest · loop National Weather Service

Radar now, the southern Rockies · loop National Weather Service

Radar now, the southern Plains · loop National Weather Service

Radar, the whole country · loop National Weather Service

Surface analysis now Weather Prediction Center

Forecast chart, 12 hours ahead Weather Prediction Center

Forecast chart, 24 hours ahead Weather Prediction Center

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, William P Hobby Airport.