Plan a flight · Sun 6:14 pm PDT (01:14 UTC)

Boeing Fld/King County International to Ontario International BFI → ONT

836 nautical miles (962 statute miles) south on a straight line, true course 164°, about 149° magnetic at the departure end (variation 15E). At 120 knots that is 6 h 26 min at the quickest height in today's winds (24,000 ft, a 10-knot tailwind), arriving about 12:40 am PDT (07:40 UTC), after sunset at the destination. Right now BFI is VFR, wind from the northwest (310°) at 6 knots; ONT is VFR, wind from the west-southwest (240°) at 8 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: 799 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 ZULU 2C: moderate icing up to 14,000 ft. Over the route from 159 to 209 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 189 to 249 nm out.
AIRMET TANGO 3W: moderate turbulence below 18,000 ft (due to mountain wave) up to 15,000 ft. Over the route from 528 to 727 nm out.
AIRMET TANGO 1W: moderate turbulence below 18,000 ft (due to mountain wave) up to 12,000 ft. Over the last 100 nm of the route.
AIRMET SIERRA 6E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 40 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 BFI.

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

E75L at 18,000 ft, 5 nm northeast, 4:24 pm PDT (23:24 UTC): moderate turbulence from 18,000 ft to 22,000 ft, remarks: mountain wave a 10-knot loss of airspeed entered by zoa fdcs. 627 nm along the route, 5 nm northeast of the line.
as filed, and in English
```
LOL UA /OV BIH300011/TM 2324/FL 180/TP E75L/TB MOD 180-220/RM MTN WAVE /-10 ENTERED BY ZOA FDCS AWC-WEB
```
Report
a routine report filed through LOL
Where
11 nm northwest (300°) of BIH
Time
23:24 UTC
Height
at 18,000 ft
Aircraft
E75L
Turbulence
moderate from 18,000 ft to 22,000 ft
Remarks
mountain wave a 10-knot loss of airspeed entered by zoa fdcs
B38M at 14,000 ft, 33 nm east, 5:13 pm PDT (00:13 UTC): moderate turbulence, light rime icing, 8 °C. At the destination end, 33 nm east of the line.
as filed, and in English
```
ONT UA /OV ONT053034/TM 0013/FL140/TP B38M/TA 08/TB MODERATE TURBULENCE/IC LIGHT RIME ICE 190 - 170
```
Report
a routine report filed through ONT
Where
34 nm northeast (053°) of ONT
Time
00:13 UTC
Height
at 14,000 ft
Aircraft
B38M
Temperature
8 °C
Turbulence
moderate turbulence
Icing
light rime ice at 19,000 ft at 17,000 ft
PC12 at 15,000 ft, 17 nm northeast, 5:42 pm PDT (00:42 UTC): remarks: zse. 50 nm along the route, 17 nm northeast 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
PC12 at 13,000 ft, 17 nm northeast, 5:42 pm PDT (00:42 UTC): remarks: zse. 50 nm along the route, 17 nm northeast 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
C182 at 8,000 ft, 29 nm southwest, 3:52 pm PDT (22:52 UTC): light rime icing, -2 °C. 100 nm along the route, 29 nm southwest 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
E175 at 6,500 ft, 8 nm southwest, 5:28 pm PDT (00:28 UTC): a broken layer above 6,500 ft. 199 nm along the route, 8 nm southwest of the line.
as filed, and in English
```
RDM UA /OV RDM/TM 0028/FL065/TP E175/SK BKN065-TOPSUNKN
```
Report
a routine report filed through RDM
Where
over RDM
Time
00:28 UTC
Height
at 6,500 ft
Aircraft
E175
Sky
a broken layer from 6,500 ft, tops unknown
E75L at 9,500 ft, 8 nm southwest, 4:07 pm PDT (23:07 UTC): light rime icing from 7,000 ft to 9,500 ft, a broken layer above 7,300 ft, -2 °C, remarks: during the descent runway 5. 199 nm along the route, 8 nm southwest of the line.
as filed, and in English
```
RDM UA /OV RDM/TM 2307/FL095/TP E75L/SK BKN073-TOPSUNKN/TA M2/IC LGT RIME 095-070/RM DURD RWY 5
```
Report
a routine report filed through RDM
Where
over RDM
Time
23:07 UTC
Height
at 9,500 ft
Aircraft
E75L
Sky
a broken layer from 7,300 ft, tops unknown
Temperature
−2 °C
Icing
light rime from 9,500 ft to 7,000 ft
Remarks
during the descent runway 5
E75L at 11,000 ft, 2 nm west, 5:36 pm PDT (00:36 UTC): trace to light rime icing from 10,500 ft to 11,500 ft, -8 °C, remarks: durc-zse. 209 nm along the route, 2 nm west of the line.
as filed, and in English
```
RDM UA /OV DSD090015/TM 0036/FL110/TP E75L/TA M08/IC TRACE-LGT RIME 105-115/RM DURC-ZSE
```
Report
a routine report filed through RDM
Where
15 nm east (090°) of DSD
Time
00:36 UTC
Height
at 11,000 ft
Aircraft
E75L
Temperature
−8 °C
Icing
trace-lgt rime from 10,500 ft to 11,500 ft
Remarks
durc-zse
E75L at 9,000 ft, 16 nm southwest, 4:05 pm PDT (23:05 UTC): light rime icing, -6 °C, remarks: zse. 209 nm along the route, 16 nm southwest 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
B739 at 33,000 ft, 14 nm west, 4:01 pm PDT (23:01 UTC): remarks: mountain wave 10 knots zlawc. 796 nm along the route, 14 nm west of the line.
as filed, and in English
```
SDB UA /OV PMD/TM 2301/FL330/TP B739/RM MTN WAVE /- 10 KT /ZLAWC AWC-WEB
```
Report
a routine report filed through SDB
Where
over PMD
Time
23:01 UTC
Height
at 33,000 ft
Aircraft
B739
Remarks
mountain wave 10 knots zlawc
B739 at 33,000 ft, 3 nm east, 4:02 pm PDT (23:02 UTC): remarks: mountain wave 10 knots zlawc. At the destination end, 3 nm east of the line.
as filed, and in English
```
DRA UA /OV VCV242015/TM 2302/FL330/TP B739/RM MTN WAVE /- 10 KT /ZLAWC AWC-WEB
```
Report
a routine report filed through DRA
Where
15 nm southwest (242°) of VCV
Time
23:02 UTC
Height
at 33,000 ft
Aircraft
B739
Remarks
mountain wave 10 knots zlawc
B739 at 4,000 ft, 35 nm west, 5:32 pm PDT (00:32 UTC): overcast above 4,000 ft. At the destination end, 35 nm west of the line.
as filed, and in English
```
BUR UA /OV BUR/TM 0032/FL040/TP B739/SK OVC040
```
Report
a routine report filed through BUR
Where
over BUR
Time
00:32 UTC
Height
at 4,000 ft
Aircraft
B739
Sky
overcast from 4,000 ft
A21N at 2,000 ft, 12 nm southwest, 6:06 pm PDT (01:06 UTC): remarks: ils 25L haze below the ceiling. At the destination end, 12 nm southwest of the line.
as filed, and in English
```
LAX UA /OV LAX070030/TM 0106/FL020/TP A21N/SK TOPS068 BASES040/RM ILS 25L - HZ BELOW THE CEILING
```
Report
a routine report filed through LAX
Where
30 nm east (070°) of LAX
Time
01:06 UTC
Height
at 2,000 ft
Aircraft
A21N
Sky
TOPS068 BASES040
Remarks
ils 25L haze below the ceiling
A20N at 5,300 ft, 26 nm southwest, 6:00 pm PDT (01:00 UTC): a broken layer from 4,300 ft to 5,300 ft. At the destination end, 26 nm southwest of the line.
as filed, and in English
```
SNA UA /OV SNA/TM 0100/FL053/TP A20N/SK BKN043-TOP053
```
Report
a routine report filed through SNA
Where
over SNA
Time
01:00 UTC
Height
at 5,300 ft
Aircraft
A20N
Sky
a broken layer from 4,300 ft, tops 5,300 ft

7 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 9 forecast points nearest it (SEA, YKM, PDX, RDM, LKV, RNO, BIH, WJF, ONT). 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	300° at 4 kt	−3 kt	3 °C	123 kt	6 h 48 min	1:02 am PDT (08:02 UTC)
7,500 ft	320° at 5 kt	−5 kt	-2 °C	125 kt	6 h 41 min	12:55 am PDT (07:55 UTC)
9,500 ft	300° at 5 kt	−3 kt	-2 °C	123 kt	6 h 48 min	1:02 am PDT (08:02 UTC)
11,500 ft	260° at 7 kt	0	-6 °C	120 kt	6 h 58 min	1:12 am PDT (08:12 UTC)
13,500 ft	260° at 7 kt	0	-10 °C	120 kt	6 h 58 min	1:12 am PDT (08:12 UTC)
15,500 ft	270° at 7 kt	−1 kt	-13 °C	121 kt	6 h 55 min	1:09 am PDT (08:09 UTC)
17,500 ft	280° at 7 kt	−2 kt	-17 °C	122 kt	6 h 51 min	1:05 am PDT (08:05 UTC)
18,000 ft FL180	280° at 7 kt	−3 kt	-18 °C	123 kt	6 h 48 min	1:02 am PDT (08:02 UTC)
24,000 ft FL240	300° at 14 kt	−10 kt	-25 °C	130 kt	6 h 26 min	12:40 am PDT (07:40 UTC)
30,000 ft FL300	270° at 22 kt	−5 kt	-31 °C	125 kt	6 h 41 min	12:55 am PDT (07:55 UTC)
34,000 ft FL340	250° at 24 kt	+4 kt	-35 °C	116 kt	7 h 12 min	1:26 am PDT (08:26 UTC)
39,000 ft FL390	240° at 30 kt	+6 kt	-42 °C	114 kt	7 h 20 min	1:34 am PDT (08:34 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°
YKM	used from 50 nm out; 54 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°
PDX	used from 100 nm out; 48 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; 29 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°
LKV	used from 249 nm out; 59 nm from the line			010/18 -6°	280/7 -11°	290/9 -22°	280/13 -27°	290/20 -31°	260/19 -34°	260/27 -39°
RNO	used from 398 nm out; 74 nm from the line		320/7	260/13 1°	230/21 -7°	210/38 -17°	220/43 -26°	230/54 -29°	230/59 -32°	230/54 -41°
BIH	used from 548 nm out; 62 nm from the line		L/V	210/14 6°	210/20 -2°	230/26 -14°	220/32 -24°	220/63 -27°	220/56 -35°	230/50 -44°
WJF	used from 697 nm out; 70 nm from the line		220/30 8°	240/28 5°	230/34 -2°	220/34 -13°	220/48 -20°	220/47 -29°	210/48 -34°	220/52 -44°
ONT	used from 796 nm out; 20 nm from the line	230/11	200/17 6°	230/27 4°	230/32 -2°	210/39 -12°	220/51 -20°	220/48 -29°	210/51 -34°	210/52 -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
BFI Seattle, WA	departure	VFR	from the northwest (310°) at 6 knots	10+ mi	none	21 ft	5:53 pm PDT (00:53 UTC)
PLU Puyallup, WA	20 nm out, 8 nm southwest of the line	VFR Weather: light drizzle	calm	10+ mi	none	537 ft	23:35 UTC
DLS The Dalles, OR	119 nm out, 14 nm east of the line	VFR Sky: overcast at 9,000 feet	from the west-southwest (240°) at 4 knots	10+ mi	9,000 ft	246 ft	00:53 UTC
RDM Redmond, OR	199 nm out, 8 nm southwest of the line, tower	VFR Sky: overcast at 6,500 feet	from the north (350°) at 8 knots	10+ mi	6,500 ft	3,081 ft	00:56 UTC
LKV Lakeview, OR	329 nm out, 10 nm southwest of the line	VFR	from the north-northeast (020°) at 14 knots	10+ mi	none	4,734 ft	00:53 UTC
RNO Reno, NV	498 nm out, 23 nm west of the line, tower	VFR Sky: scattered clouds at 9,000 feet	from the north (360°) at 14 knots, gusting to 22	10+ mi	none	4,414 ft	00:55 UTC
SPZ Silver Springs, NV	508 nm out, 2 nm northwest of the line	no report just now				4,265 ft
MMH Mammoth Lakes, CA	617 nm out, 9 nm west of the line	VFR Sky: scattered clouds at 9,000 feet	from the southeast (140°) at 19 knots, gusting to 30	10+ mi	none	7,134 ft	23:35 UTC
IYK Inyokern, CA	737 nm out, 12 nm east of the line	no report just now				2,457 ft
MHV Mojave, CA	767 nm out, 13 nm southwest of the line, tower	VFR Sky: overcast at 14,000 feet	from the southwest (220°) at 21 knots, gusting to 32	10+ mi	14,000 ft	2,801 ft	22:15 UTC
ONT Ontario, CA	destination	VFR Sky: scattered clouds at 4,900 feet, a broken layer at 12,000 feet	from the west-southwest (240°) at 8 knots	10+ mi	12,000 ft	944 ft	5:53 pm PDT (00:53 UTC)

The highest airport on this list sits at 7,134 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At ONT when you get there the forecast at the estimated arrival, 12:40 am PDT (07:40 UTC)

Wind from the west-southwest at 8 knots, visibility more than 6 miles, showers nearby, overcast at 2,500 feet marginal VFR

The whole forecast for ONT

From Sun 5:00 pm PDT (00:00 UTC): wind from the southwest at 11 knots, gusting to 18, visibility more than 6 miles, a few clouds at 3,000 feet, a broken layer at 5,000 feet
From Sun 11:00 pm PDT (06:00 UTC): wind from the west-southwest at 8 knots, visibility more than 6 miles, showers nearby, overcast at 2,500 feet
From Mon 3:00 am PDT (10:00 UTC): wind from the west-southwest at 4 knots, visibility more than 6 miles, showers nearby, a few clouds at 2,500 feet, a broken layer at 5,000 feet
From Mon 11:00 am PDT (18:00 UTC): wind from the west-southwest at 5 knots, visibility more than 6 miles, a broken layer at 5,000 feet
From Mon 2:00 pm PDT (21:00 UTC): wind from the west-southwest at 11 knots, gusting to 18, visibility more than 6 miles, a broken layer at 5,000 feet
From Mon 8:00 pm PDT (03:00 UTC): wind from the west-southwest at 9 knots, visibility more than 6 miles, a broken layer at 6,000 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

6/8783 38NM NE BAKERSFIELD, CA, Saturday, October 10, 2026 through Friday, October 23, 2026 UTC 10 nm from the route, 727 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 23 October · ZLA
4/3635 DISNEYLAND THEME PARK, ANAHEIM,, CA 19 nm from the route, at the destination end · security · ZLA

Daylight

Sunset at BFI 6:27 pm PDT (01:27 UTC), at ONT 6:20 pm PDT (01:20 UTC) (civil twilight ends 6:45 pm PDT (01:45 UTC)). At 120 knots the arrival at ONT is before sunrise there (6:53 am PDT (13:53 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, Ontario International.