Plan a flight · Sun 5:11 pm PDT (00:11 UTC)

Boeing Fld/King County International to San Francisco International BFI → SFO

595 nautical miles (685 statute miles) south on a straight line, true course 180°, about 165° magnetic at the departure end (variation 15E). At 120 knots that is 3 h 19 min at the quickest height in today's winds (24,000 ft, a 59-knot tailwind), arriving about 8:30 pm PDT (03:30 UTC), after sunset at the destination. Right now BFI is VFR, wind variable at 6 knots; SFO is VFR, wind from the west-southwest (250°) at 12 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: 14 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 25,000 ft to 39,000 ft. Over the first 0 nm of the route.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Near the route, 238 nm along 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

E75L at 10,000 ft, 6 nm southwest, 3:04 pm PDT (22:04 UTC): moderate rime icing, -9 °C, remarks: from 10,000 ft to 7,500 ft during the descent. 89 nm along the route, 6 nm southwest of the line.
as filed, and in English
```
PDX UA /OV PDX360025/TM 2204/FL100/TP E75L/TA M9/IC MOD RIME /RM 100-075 DURD
```
Report
a routine report filed through PDX
Where
25 nm north (360°) of PDX
Time
22:04 UTC
Height
at 10,000 ft
Aircraft
E75L
Temperature
−9 °C
Icing
moderate rime
Remarks
from 10,000 ft to 7,500 ft during the descent
C182 at 8,000 ft, 3 nm northeast, 3:52 pm PDT (22:52 UTC): light rime icing, -2 °C. 109 nm along the route, 3 nm northeast of the line.
as filed, and in English
```
PDX UA /OV PDX040017/TM 2252/FL080/TP C182/TA M02/IC LGT RIME
```
Report
a routine report filed through PDX
Where
17 nm northeast (040°) of PDX
Time
22:52 UTC
Height
at 8,000 ft
Aircraft
C182
Temperature
−2 °C
Icing
light rime
E75L at 9,000 ft, 46 nm east, 4:05 pm PDT (23:05 UTC): light rime icing, -6 °C, remarks: zse. 208 nm along the route, 46 nm east of the line.
as filed, and in English
```
RDM UA /OV DSD155012/TM 2305/FL090/TP E75L/TA M06/IC LGT RIME/RM ZSE
```
Report
a routine report filed through RDM
Where
12 nm southeast (155°) of DSD
Time
23:05 UTC
Height
at 9,000 ft
Aircraft
E75L
Temperature
−6 °C
Icing
light rime
Remarks
zse
PA32 at 6,500 ft, 28 nm west, 3:23 pm PDT (22:23 UTC): light chop turbulence. 288 nm along the route, 28 nm west of the line.
as filed, and in English
```
MFR UA /OV BROKN/TM 2223/FL065/TP PA32/TB LT CHOP
```
Report
a routine report filed through MFR
Where
brokn
Time
22:23 UTC
Height
at 6,500 ft
Aircraft
PA32
Turbulence
lt chop
B772 at 37,000 ft, 19 nm east, 4:31 pm PDT (23:31 UTC): light to moderate turbulence, remarks: zse. 347 nm along the route, 19 nm east of the line.
as filed, and in English
```
LMT UA /OV LMT186024/TM 2331/FL370/TP B772/TB CONS LGT-MOD/RM ZSE
```
Report
a routine report filed through LMT
Where
24 nm south (186°) of LMT
Time
23:31 UTC
Height
at 37,000 ft
Aircraft
B772
Turbulence
continuous light to moderate
Remarks
zse

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 7 forecast points nearest it (SEA, PDX, RDM, SIY, RBL, SAC, 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	330° at 6 kt	−5 kt		125 kt	4 h 46 min	9:57 pm PDT (04:57 UTC)
5,500 ft	010° at 10 kt	−10 kt	2 °C	130 kt	4 h 35 min	9:46 pm PDT (04:46 UTC)
7,500 ft	020° at 11 kt	−10 kt	-1 °C	130 kt	4 h 35 min	9:46 pm PDT (04:46 UTC)
9,500 ft	020° at 12 kt	−11 kt	-5 °C	131 kt	4 h 33 min	9:44 pm PDT (04:44 UTC)
11,500 ft	010° at 12 kt	−12 kt	-8 °C	132 kt	4 h 30 min	9:41 pm PDT (04:41 UTC)
13,500 ft	010° at 18 kt	−18 kt	-12 °C	138 kt	4 h 19 min	9:30 pm PDT (04:30 UTC)
15,500 ft	010° at 27 kt	−27 kt	-15 °C	147 kt	4 h 03 min	9:14 pm PDT (04:14 UTC)
17,500 ft	010° at 36 kt	−35 kt	-17 °C	155 kt	3 h 50 min	9:01 pm PDT (04:01 UTC)
18,000 ft FL180	010° at 38 kt	−37 kt	-18 °C	157 kt	3 h 47 min	8:58 pm PDT (03:58 UTC)
24,000 ft FL240	360° at 59 kt	−59 kt	-25 °C	179 kt	3 h 19 min	8:30 pm PDT (03:30 UTC)
30,000 ft FL300	350° at 50 kt	−49 kt	-34 °C	169 kt	3 h 31 min	8:42 pm PDT (03:42 UTC)
34,000 ft FL340	330° at 34 kt	−30 kt	-36 °C	150 kt	3 h 58 min	9:09 pm PDT (04:09 UTC)
39,000 ft FL390	300° at 23 kt	−12 kt	-41 °C	132 kt	4 h 30 min	9:41 pm PDT (04:41 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; 20 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°
PDX	used from 50 nm out; 44 nm from the line	330/7	360/13 0°	040/22 -6°	030/23 -12°	020/64 -18°	010/93 -25°	010/91 -39°	360/62 -40°	350/41 -43°
RDM	used from 149 nm out; 55 nm from the line		010/15 -2°	030/21 -8°	020/26 -12°	020/46 -22°	010/72 -27°	360/47 -34°	340/31 -35°	320/20 -40°
SIY	used from 248 nm out; 73 nm from the line		020/15 4°	020/16 -5°	010/11 -10°	010/47 -18°	360/70 -25°	350/58 -34°	330/46 -35°	300/23 -40°
RBL	used from 397 nm out; 22 nm from the line	350/10	350/7 6°	L/V -1°	320/6 -8°	340/24 -18°	340/38 -24°	330/32 -30°	300/25 -34°	270/37 -40°
SAC	used from 496 nm out; 46 nm from the line	270/5	L/V 5°	L/V -1°	240/11 -5°	250/22 -15°	270/25 -24°	260/31 -27°	240/39 -33°	240/39 -42°
SFO	used from 545 nm out; 25 nm from the line	220/11	L/V 5°	280/7 1°	270/15 -3°	290/23 -14°	310/29 -24°	280/26 -28°	250/30 -34°	250/36 -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	variable at 6 knots	10+ mi	none	21 ft	4:53 pm PDT (23:53 UTC)
TIW Tacoma, WA	20 nm out, 12 nm west of the line, tower	VFR	from the north-northeast (030°) at 8 knots	10+ mi	none	294 ft	23:53 UTC
TTD Portland, OR	119 nm out, 3 nm west of the line, tower	VFR Sky: a broken layer at 7,500 feet, overcast at 9,500 feet	from the east-northeast (070°) at 4 knots	10+ mi	7,500 ft	38 ft	23:53 UTC
UAO Aurora, OR	139 nm out, 19 nm west of the line, tower	VFR Sky: scattered clouds at 7,000 feet	from the north-northeast (030°) at 5 knots	10+ mi	none	199 ft	23:53 UTC
MFR Medford, OR	307 nm out, 24 nm west of the line, tower	VFR	from the north-northwest (340°) at 16 knots, gusting to 25	10+ mi	none	1,335 ft	23:53 UTC
RDD Redding, CA	426 nm out, 6 nm northeast of the line, tower	VFR	from the north (360°) at 10 knots, gusting to 20	10+ mi	none	505 ft	23:53 UTC
WLW Willows, CA	486 nm out, 8 nm northeast of the line	no report just now				141 ft
APC Napa, CA	555 nm out, 6 nm southeast of the line, tower	VFR	from the south (190°) at 17 knots, gusting to 24	10+ mi	none	35 ft	23:54 UTC
SFO San Francisco, CA	destination	VFR Sky: a few clouds at 2,000 feet	from the west-southwest (250°) at 12 knots	10+ mi	none	13 ft	4:56 pm PDT (23:56 UTC)

The highest airport on this list sits at 1,335 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, 8:30 pm PDT (03:30 UTC)

Wind from the west-southwest at 8 knots, visibility more than 6 miles, a few clouds at 2,000 feet VFR

The whole forecast for SFO

From Sun 5:00 pm PDT (00:00 UTC): wind from the west-southwest at 16 knots, visibility more than 6 miles, a few clouds at 2,000 feet
From Sun 7:00 pm PDT (02:00 UTC): wind from the west-southwest at 8 knots, visibility more than 6 miles, a few clouds at 2,000 feet
From Mon 1:00 am PDT (08:00 UTC): wind from the south-southeast at 4 knots, visibility more than 6 miles, clear skies
From Mon 11:00 am PDT (18:00 UTC): wind from the east-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 10 knots, visibility more than 6 miles, clear skies

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

6/7455 SAN FRANCISCO, CA, Thursday, October 8, 2026 through Sunday, October 11, 2026 Local 0 nm from the route, at the destination end · security · ended 11 October · ZOA
6/6741 SAN FRANCISCO, CA, Thursday, October 8, 2026 through Sunday, October 11, 2026 Local on the route, at the destination end · air shows/sports · ended 11 October · ZOA
6/7231 Santa Clara, CA, Sunday, October 11, 2026 through Monday, October 12, 2026 UTC 22 nm from the route, at the destination end · drones kept away from a public gathering · until 12 October · ZOA

Daylight

Sunset at BFI 6:27 pm PDT (01:27 UTC), at SFO 6:36 pm PDT (01:36 UTC) (civil twilight ends 7:02 pm PDT (02:02 UTC)). At 120 knots the arrival at SFO is after sunset there (6:38 pm PDT (01:38 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 Pacific Southwest · 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, San Francisco International.