Ontario International to Seattle-Tacoma International ONT → SEA
832 nautical miles (957 statute miles) north on a straight line, true course 347°, about 335° magnetic at the departure end (variation 12E). At 120 knots that is 6 h 33 min at the quickest height in today's winds (39,000 ft, a 7-knot tailwind), arriving about 4:48 am PDT (11:48 UTC), after sunset at the destination. 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 W14W: thunderstorms (a convective SIGMET) up to 28,000 ft, moving from the southwest at 20 knots, until 11:55 pm PDT (06:55 UTC). Near the route, 257 nm along the route.
as issued
WSUS33 KKCI 120455 MKCW WST 120455 CONVECTIVE SIGMET 14W VALID UNTIL 0655Z NV FROM 40NW BVL-20WNW ELY-20SSE OAL-40WNW OAL-50NE BAM-40NW BVL AREA TS MOV FROM 24020KT. TOPS TO FL280.
- AIRMET TANGO 1W: moderate turbulence below 18,000 ft (due to mountain wave) up to 15,000 ft. Over the first 149 nm of the route.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 475 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 594 to 594 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 ONT.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
Not fetched just now.
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 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 9 forecast points nearest it (ONT, WJF, BIH, RNO, LKV, RDM, PDX, 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 | 070° at 2 kt | 0 | 2 °C | 120 kt | 6 h 56 min | 5:11 am PDT (12:11 UTC) |
| 6,500 ft | 050° at 3 kt | +1 kt | 1 °C | 119 kt | 6 h 59 min | 5:14 am PDT (12:14 UTC) |
| 8,500 ft | 360° at 4 kt | +4 kt | -4 °C | 116 kt | 7 h 10 min | 5:25 am PDT (12:25 UTC) |
| 10,500 ft | 330° at 3 kt | +3 kt | -6 °C | 117 kt | 7 h 07 min | 5:22 am PDT (12:22 UTC) |
| 12,500 ft | 290° at 3 kt | +1 kt | -9 °C | 119 kt | 6 h 59 min | 5:14 am PDT (12:14 UTC) |
| 14,500 ft | 320° at 5 kt | +4 kt | -12 °C | 116 kt | 7 h 10 min | 5:25 am PDT (12:25 UTC) |
| 16,500 ft | 330° at 7 kt | +6 kt | -15 °C | 114 kt | 7 h 18 min | 5:33 am PDT (12:33 UTC) |
| 18,000 ft FL180 | 330° at 9 kt | +8 kt | -17 °C | 112 kt | 7 h 26 min | 5:41 am PDT (12:41 UTC) |
| 24,000 ft FL240 | 330° at 22 kt | +21 kt | -25 °C | 99 kt | 8 h 24 min | 6:39 am PDT (13:39 UTC) |
| 30,000 ft FL300 | 310° at 21 kt | +18 kt | -32 °C | 102 kt | 8 h 09 min | 6:24 am PDT (13:24 UTC) |
| 34,000 ft FL340 | 270° at 19 kt | +5 kt | -37 °C | 115 kt | 7 h 14 min | 5:29 am PDT (12:29 UTC) |
| 39,000 ft FL390 | 240° at 28 kt | −7 kt | -42 °C | 127 kt | 6 h 33 min | 4:48 am PDT (11:48 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| ONT | used from 0 nm out; 25 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° |
| WJF | used from 50 nm out; 34 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° | |
| BIH | used from 149 nm out; 31 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° | |
| RNO | used from 297 nm out; 30 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° | |
| LKV | used from 446 nm out; 35 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° | ||
| RDM | used from 545 nm out; 65 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° | |
| PDX | used from 693 nm out; 44 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° |
| YKM | used from 743 nm out; 56 nm from the line | 070/10 | 040/15 -1° | 020/27 -8° | 030/25 -13° | 020/48 -20° | 010/83 -27° | 010/77 -37° | 010/49 -40° | 350/14 -41° |
| SEA | used from 792 nm out; 20 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° |
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 |
|---|---|---|---|---|---|---|---|
| ONT Ontario, CA | departure | no report just now | 944 ft | ||||
| MHV Mojave, CA | 69 nm out, 13 nm southwest of the line, tower | no report just now | 2,801 ft | ||||
| IYK Inyokern, CA | 99 nm out, 12 nm east of the line | no report just now | 2,457 ft | ||||
| MMH Mammoth Lakes, CA | 218 nm out, 9 nm west of the line | no report just now | 7,134 ft | ||||
| SPZ Silver Springs, NV | 327 nm out, 4 nm north of the line | no report just now | 4,265 ft | ||||
| RNO Reno, NV | 347 nm out, 22 nm southwest of the line, tower | no report just now | 4,414 ft | ||||
| LKV Lakeview, OR | 505 nm out, 8 nm west of the line | no report just now | 4,734 ft | ||||
| RDM Redmond, OR | 634 nm out, 6 nm west of the line, tower | no report just now | 3,081 ft | ||||
| CZK Cascade Locks, OR | 723 nm out, 13 nm west of the line | no report just now | 151 ft | ||||
| PLU Puyallup, WA | 812 nm out, 5 nm west of the line | no report just now | 537 ft | ||||
| SEA Seattle, WA | destination | no report just now | 432 ft |
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 SEA when you get there the forecast at the estimated arrival, 4:48 am PDT (11:48 UTC)
SEA has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 4/3635 DISNEYLAND THEME PARK, ANAHEIM,, CA 19 nm from the route, at the departure end · security · ZLA
- 6/8783 38NM NE BAKERSFIELD, CA, Saturday, October 10, 2026 through Friday, October 23, 2026 UTC 10 nm from the route, 109 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 23 October · ZLA
Daylight
Sunset at ONT 6:20 pm PDT (01:20 UTC), at SEA 6:27 pm PDT (01:27 UTC) (civil twilight ends 6:58 pm PDT (01:58 UTC)). At 120 knots the arrival at SEA is before sunrise there (7:23 am PDT (14:23 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: Ontario International, Seattle-Tacoma International.