Plan a flight · Sun 8:28 pm PDT (03:28 UTC)

Seattle-Tacoma International to Ontario International SEA → ONT

832 nautical miles (957 statute miles) south on a straight line, true course 163°, about 147° magnetic at the departure end (variation 16E). At 120 knots that is 5 h 57 min at the quickest height in today's winds (24,000 ft, a 20-knot tailwind), arriving about 2:25 am PDT (09:25 UTC), after sunset at the destination. Right now SEA is VFR, wind from the north-northeast (030°) at 8 knots; ONT is VFR, wind from the west-southwest (240°) at 6 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: 5,009 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 W12W: thunderstorms (a convective SIGMET) up to 31,000 ft, moving from the southwest at 20 knots, until 9:55 pm PDT (04:55 UTC). Near the route, 594 nm along the route.
as issued
```
WSUS33 KKCI 120255
MKCW WST 120255
CONVECTIVE SIGMET 12W
VALID UNTIL 0455Z
NV
FROM 40SSE TWF-10W ELY-30SE OAL-30W OAL-70WSW TWF-40SSE TWF
AREA TS MOV FROM 24020KT. TOPS TO FL310.
```
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 475 nm of the route.
AIRMET ZULU 2C: moderate icing up to 20,000 ft. Over the route from 149 to 277 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Near the route, 505 nm along the route.
AIRMET TANGO 1W: moderate turbulence below 18,000 ft (due to mountain wave) up to 15,000 ft. Over the last 267 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 SEA.

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

A321 at 13,500 ft, 19 nm east, 6:54 pm PDT (01:54 UTC): remarks: zse. 40 nm along the route, 19 nm east of the line.
as filed, and in English
```
SEA UA /OV SEA120045/TM 0154/FL135/TP A321/SK TOP130/RM ZSE
```
Report
a routine report filed through SEA
Where
45 nm southeast (120°) of SEA
Time
01:54 UTC
Height
at 13,500 ft
Aircraft
A321
Sky
TOP130
Remarks
zse
PC12 at 13,000 ft, 19 nm east, 5:42 pm PDT (00:42 UTC): remarks: zse. 40 nm along the route, 19 nm east 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 east, 5:42 pm PDT (00:42 UTC): remarks: zse. 40 nm along the route, 19 nm east 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
B738 at 11,000 ft, 6 nm west, 6:19 pm PDT (01:19 UTC): light rime icing, remarks: during the descent runway 5. 198 nm along the route, 6 nm west of the line.
as filed, and in English
```
RDM UA /OV RDM/TM 0119/FL110/TP B738/TA UNKN/IC LGT RIME/RM DURD RWY 5
```
Report
a routine report filed through RDM
Where
over RDM
Time
01:19 UTC
Height
at 11,000 ft
Aircraft
B738
Temperature
UNKN
Icing
light rime
Remarks
during the descent runway 5
E75L at 11,000 ft, 6 nm west, 6:16 pm PDT (01:16 UTC): light rime icing, remarks: during the descent runway 29. 198 nm along the route, 6 nm west of the line.
as filed, and in English
```
RDM UA /OV RDM/TM 0116/FL110/TP E75L/TA UNKN/IC LGT RIME/RM DURD RWY 29
```
Report
a routine report filed through RDM
Where
over RDM
Time
01:16 UTC
Height
at 11,000 ft
Aircraft
E75L
Temperature
UNKN
Icing
light rime
Remarks
during the descent runway 29
E75L at 11,000 ft, 4 nm north, 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. 208 nm along the route, 4 nm north 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 35,000 ft, 8 nm west, 6:18 pm PDT (01:18 UTC): light to moderate chop turbulence, remarks: zse. 307 nm along the route, 8 nm west of the line.
as filed, and in English
```
LKV UA /OV LKV/TM 0118/FL350/TP E75L/TB LGT OCNL MOD CHOP/RM ZSE
```
Report
a routine report filed through LKV
Where
over LKV
Time
01:18 UTC
Height
at 35,000 ft
Aircraft
E75L
Turbulence
light occasional moderate chop
Remarks
zse
B38M descending, 24 nm west, 6:28 pm PDT (01:28 UTC): light chop turbulence, remarks: during the descent runway 35L rno. 495 nm along the route, 24 nm west of the line.
as filed, and in English
```
RNO UA /OV KRNO167009/TM 0128/FLUNKN/TP B38M/TB OCNL LGT CHOP/RM DURD RY35L RNO
```
Report
a routine report filed through RNO
Where
9 nm south (167°) of KRNO
Time
01:28 UTC
Height
height not given
Aircraft
B38M
Turbulence
occasional light chop
Remarks
during the descent runway 35L rno
E75L climbing, 21 nm west, 7:15 pm PDT (02:15 UTC): a routine report with nothing remarked on. At the destination end, 21 nm west of the line.
as filed, and in English
```
ONT UA /OV ONT290030/TM 0215/FLDURC/TP E75L/SK T-078
```
Report
a routine report filed through ONT
Where
30 nm west (290°) of ONT
Time
02:15 UTC
Height
during the climb
Aircraft
E75L
Sky
T-078
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
B737 climbing, 13 nm west, 8:01 pm PDT (03:01 UTC): a routine report with nothing remarked on. At the destination end, 13 nm west of the line.
as filed, and in English
```
ONT UA /OV ONT278016/TM 0301/FLDURC/TP B737/SK B-047 -T080
```
Report
a routine report filed through ONT
Where
16 nm west (278°) of ONT
Time
03:01 UTC
Height
during the climb
Aircraft
B737
Sky
B-047 T080
SLG4 at 3,000 ft, 15 nm southwest, 6:33 pm PDT (01:33 UTC): scattered clouds above 4,000 ft. At the destination end, 15 nm southwest of the line.
as filed, and in English
```
EMT UA /OV EMT070006/TM 0133/FL030/TP SLG4/SK SCT040
```
Report
a routine report filed through EMT
Where
6 nm east (070°) of EMT
Time
01:33 UTC
Height
at 3,000 ft
Aircraft
SLG4
Sky
scattered clouds from 4,000 ft
A20N climbing, 7 nm south, 8:04 pm PDT (03:04 UTC): a routine report with nothing remarked on. At the destination end, 7 nm south of the line.
as filed, and in English
```
ONT UA /OV ONT153007/TM 0304/FLDURC/TP A20N/SK B-036 -T047
```
Report
a routine report filed through ONT
Where
7 nm southeast (153°) of ONT
Time
03:04 UTC
Height
during the climb
Aircraft
A20N
Sky
B-036 T047
A20N climbing, 3 nm southwest, 8:03 pm PDT (03:03 UTC): a routine report with nothing remarked on. At the destination end, 3 nm southwest of the line.
as filed, and in English
```
ONT UA /OV ONT204003/TM 0303/FLDURC/TP A20N/SK B-030
```
Report
a routine report filed through ONT
Where
3 nm southwest (204°) of ONT
Time
03:03 UTC
Height
during the climb
Aircraft
A20N
Sky
B-030

3 more routine reports are on the map.

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 8 forecast points nearest it (SEA, 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	080° at 1 kt	0	2 °C	120 kt	6 h 56 min	3:24 am PDT (10:24 UTC)
7,500 ft	360° at 2 kt	−2 kt	-2 °C	122 kt	6 h 49 min	3:17 am PDT (10:17 UTC)
9,500 ft	330° at 3 kt	−3 kt	-4 °C	123 kt	6 h 46 min	3:14 am PDT (10:14 UTC)
11,500 ft	290° at 3 kt	−1 kt	-7 °C	121 kt	6 h 53 min	3:21 am PDT (10:21 UTC)
13,500 ft	310° at 4 kt	−3 kt	-10 °C	123 kt	6 h 46 min	3:14 am PDT (10:14 UTC)
15,500 ft	320° at 6 kt	−5 kt	-13 °C	125 kt	6 h 39 min	3:07 am PDT (10:07 UTC)
17,500 ft	320° at 9 kt	−8 kt	-16 °C	128 kt	6 h 30 min	2:58 am PDT (09:58 UTC)
18,000 ft FL180	330° at 10 kt	−9 kt	-17 °C	129 kt	6 h 27 min	2:55 am PDT (09:55 UTC)
24,000 ft FL240	330° at 21 kt	−20 kt	-25 °C	140 kt	5 h 57 min	2:25 am PDT (09:25 UTC)
30,000 ft FL300	310° at 21 kt	−17 kt	-32 °C	137 kt	6 h 04 min	2:32 am PDT (09:32 UTC)
34,000 ft FL340	270° at 20 kt	−6 kt	-37 °C	126 kt	6 h 36 min	3:04 am PDT (10:04 UTC)
39,000 ft FL390	240° at 29 kt	+6 kt	-42 °C	114 kt	7 h 18 min	3:46 am PDT (10:46 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
SEA	used from 0 nm out; 25 nm from the line	050/7	050/11 1°	050/12 -5°	030/31 -7°	010/61 -15°	010/69 -26°	360/73 -40°	360/62 -47°	330/21 -43°
PDX	used from 50 nm out; 52 nm from the line	L/V	030/7 1°	020/12 -6°	020/29 -9°	010/69 -16°	010/81 -25°	360/83 -40°	360/67 -46°	320/29 -42°
RDM	used from 149 nm out; 25 nm from the line		040/17 -1°	030/31 -8°	010/29 -12°	010/61 -19°	360/95 -25°	360/82 -36°	360/40 -37°	310/19 -40°
LKV	used from 248 nm out; 56 nm from the line			010/8 -8°	350/13 -11°	340/21 -21°	360/60 -26°	350/37 -32°	310/26 -35°	260/25 -39°
RNO	used from 396 nm out; 72 nm from the line		010/9	320/10 -2°	210/23 -9°	210/34 -19°	220/36 -25°	230/31 -29°	230/41 -33°	230/38 -42°
BIH	used from 545 nm out; 61 nm from the line		L/V	240/7 1°	190/13 -3°	200/26 -16°	210/43 -26°	220/54 -28°	220/51 -35°	220/47 -43°
WJF	used from 693 nm out; 70 nm from the line		200/28 6°	210/28 3°	210/29 -4°	210/28 -14°	220/41 -20°	220/47 -29°	220/46 -37°	220/53 -44°
ONT	used from 792 nm out; 20 nm from the line	190/8	190/19 6°	210/23 4°	210/29 -3°	210/47 -13°	210/49 -19°	220/47 -30°	220/50 -36°	220/55 -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
SEA Seattle, WA	departure	VFR Sky: a few clouds at 3,000 feet	from the north-northeast (030°) at 8 knots	10+ mi	none	432 ft	7:53 pm PDT (02:53 UTC)
PLU Puyallup, WA	20 nm out, 5 nm west of the line	VFR Weather: light drizzle	calm	10+ mi	none	537 ft	03:15 UTC
CZK Cascade Locks, OR	109 nm out, 13 nm west of the line	no report just now				151 ft
RDM Redmond, OR	198 nm out, 6 nm west of the line, tower	VFR Sky: overcast at 4,900 feet	from the northwest (310°) at 5 knots	10+ mi	4,900 ft	3,081 ft	02:56 UTC
LKV Lakeview, OR	327 nm out, 8 nm west of the line	VFR	from the north (350°) at 14 knots, gusting to 19	10+ mi	none	4,734 ft	02:53 UTC
RNO Reno, NV	485 nm out, 22 nm southwest of the line, tower	VFR Sky: a few clouds at 9,000 feet	from the west-northwest (290°) at 5 knots	10+ mi	none	4,414 ft	02:55 UTC
SPZ Silver Springs, NV	505 nm out, 4 nm north of the line	no report just now				4,265 ft
MMH Mammoth Lakes, CA	614 nm out, 9 nm west of the line	VFR	from the north-northwest (330°) at 8 knots	10+ mi	none	7,134 ft	03:15 UTC
IYK Inyokern, CA	733 nm out, 12 nm east of the line	no report just now				2,457 ft
MHV Mojave, CA	762 nm out, 13 nm southwest of the line, tower	VFR	from the south-southwest (210°) at 16 knots	10+ mi	none	2,801 ft	02:35 UTC
ONT Ontario, CA	destination	VFR Sky: scattered clouds at 3,200 feet, a broken layer at 4,500 feet, a broken layer at 5,500 feet	from the west-southwest (240°) at 6 knots	10+ mi	4,500 ft	944 ft	7:53 pm PDT (02:53 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, 2:25 am PDT (09:25 UTC)

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

The whole forecast for ONT

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 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 6 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 SEA, the departure

From Sun 8:00 pm PDT (03:00 UTC): wind from the north at 6 knots, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind from the southeast at 4 knots, 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 4 knots, visibility more than 6 miles, clear skies
From Mon 11:00 am PDT (18:00 UTC): wind from the west at 6 knots, visibility more than 6 miles, clear skies
From Mon 8:00 pm PDT (03:00 UTC): wind from the northwest at 5 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

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, 723 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 SEA 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: Seattle-Tacoma International, Ontario International.