City Of Colorado Springs Municipal to Seattle-Tacoma International COS → SEA
927 nautical miles (1,066 statute miles) northwest on a straight line, true course 310°, about 302° magnetic at the departure end (variation 8E). At 120 knots that is 7 h 29 min at the quickest height in today's winds (8,500 ft, a 4-knot tailwind), arriving about 1:33 am PDT (08:33 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: 6 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 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the first 668 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the first 418 nm of the route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 90 to 757 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). Over the route from 110 to 389 nm out.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 189 to 259 nm out.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 269 to 548 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). Over the route from 379 to 578 nm out.
- AIRMET ZULU 2C: moderate icing up to 14,000 ft. Over the route from 628 to 817 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 COS.
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 20:00–03:00 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 7 forecast points nearest it (DEN, RKS, PIH, BOI, LWS, 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 | 350° at 8 kt | +5 kt | 4 °C | 115 kt | 8 h 04 min | 2:08 am PDT (09:08 UTC) |
| 6,500 ft | 350° at 9 kt | +5 kt | 0 °C | 115 kt | 8 h 04 min | 2:08 am PDT (09:08 UTC) |
| 8,500 ft | 200° at 9 kt | −4 kt | 1 °C | 124 kt | 7 h 29 min | 1:33 am PDT (08:33 UTC) |
| 10,500 ft | 210° at 15 kt | −4 kt | -2 °C | 124 kt | 7 h 29 min | 1:33 am PDT (08:33 UTC) |
| 12,500 ft | 210° at 21 kt | −3 kt | -4 °C | 123 kt | 7 h 32 min | 1:36 am PDT (08:36 UTC) |
| 14,500 ft | 210° at 24 kt | −3 kt | -8 °C | 123 kt | 7 h 32 min | 1:36 am PDT (08:36 UTC) |
| 16,500 ft | 210° at 27 kt | −3 kt | -11 °C | 123 kt | 7 h 32 min | 1:36 am PDT (08:36 UTC) |
| 18,000 ft FL180 | 210° at 29 kt | −2 kt | -14 °C | 122 kt | 7 h 36 min | 1:40 am PDT (08:40 UTC) |
| 24,000 ft FL240 | 220° at 28 kt | −1 kt | -24 °C | 121 kt | 7 h 40 min | 1:44 am PDT (08:44 UTC) |
| 30,000 ft FL300 | 220° at 34 kt | 0 | -34 °C | 120 kt | 7 h 44 min | 1:48 am PDT (08:48 UTC) |
| 34,000 ft FL340 | 230° at 46 kt | +12 kt | -37 °C | 108 kt | 8 h 35 min | 2:39 am PDT (09:39 UTC) |
| 39,000 ft FL390 | 240° at 51 kt | +20 kt | -44 °C | 100 kt | 9 h 16 min | 3:20 am PDT (10:20 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| DEN | used from 0 nm out; 52 nm from the line | 190/31 16° | 210/32 7° | 240/41 -8° | 230/47 -21° | 240/56 -32° | 250/65 -37° | 250/61 -47° | ||
| RKS | used from 149 nm out; 87 nm from the line | 190/43 | 210/65 3° | 210/57 -9° | 210/56 -21° | 210/47 -33° | 230/63 -37° | 240/77 -46° | ||
| PIH | used from 349 nm out; 64 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° | |
| BOI | used from 548 nm out; 76 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° | |
| LWS | used from 648 nm out; 61 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° |
| YKM | used from 747 nm out; 67 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° |
| SEA | used from 897 nm out; 15 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° |
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 |
|---|---|---|---|---|---|---|---|
| COS Colorado Springs, CO | departure | no report just now | 6,187 ft | ||||
| GNB Granby, CO | 90 nm out, 24 nm northeast of the line | no report just now | 8,207 ft | ||||
| CAG Craig, CO | 169 nm out, 5 nm south of the line | no report just now | 6,197 ft | ||||
| RKS Rock Springs, WY | 259 nm out, 7 nm northeast of the line | no report just now | 6,764 ft | ||||
| AFO Afton, WY | 369 nm out, 12 nm northeast of the line | no report just now | 6,220 ft | ||||
| PIH Pocatello, ID | 438 nm out, 21 nm southwest of the line, tower | no report just now | 4,451 ft | ||||
| AOC Arco, ID | 488 nm out, 6 nm south of the line | no report just now | 5,334 ft | ||||
| MYL Mc Call, ID | 628 nm out, 5 nm south of the line | no report just now | 5,024 ft | ||||
| ALW Walla Walla, WA | 737 nm out, 11 nm north of the line, tower | no report just now | 1,194 ft | ||||
| PSC Pasco, WA | 777 nm out, 1 nm north of the line, tower | no report just now | 410 ft | ||||
| YKM Yakima, WA | 837 nm out, 12 nm southwest of the line, tower | no report just now | 1,098 ft | ||||
| SEA Seattle, WA | destination | no report just now | 432 ft |
The highest airport on this list sits at 8,207 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, 1:33 am PDT (08:33 UTC)
SEA has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/8770 COLORADO SPRINGS, CO, Saturday, October 10, 2026 through Monday, October 12, 2026 UTC 1 nm from the route, at the departure end · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 12 October · ZDV
- 6/8784 LAKE GEORGE, CO, Sunday, October 11, 2026 through Tuesday, October 13, 2026 UTC 11 nm from the route, at the departure end · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 13 October · ZDV
Daylight
Sunset at COS 6:25 pm MDT (00:25 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: City Of Colorado Springs Municipal, Seattle-Tacoma International.