Seattle-Tacoma International to City Of Colorado Springs Municipal SEA → COS
927 nautical miles (1,066 statute miles) southeast on a straight line, true course 118°, about 102° magnetic at the departure end (variation 16E). At 120 knots that is 6 h 37 min at the quickest height in today's winds (39,000 ft, a 20-knot tailwind), arriving about 2:47 am MDT (08:47 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
- SIGMET 6W: thunderstorms (a convective SIGMET) up to 34,000 ft, moving from the southwest at 40 knots, until 8:55 pm PDT (03:55 UTC). Near the route, at the destination end.
as issued
WSUS33 KKCI 120155 MKCW WST 120155 CONVECTIVE SIGMET 6W VALID UNTIL 0355Z CO NM FROM 50SSW DEN-30NNE TBE-50SSW CME-50E SJN-20NE DVC-50SSW DEN AREA TS MOV FROM 23040KT. TOPS TO FL340.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 139 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 100 to 319 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 169 to 727 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 628 nm of the route.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 329 to 727 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 339 to 578 nm out.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 389 nm of the route.
- 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 578 to 887 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 658 to 737 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 817 to 877 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 SEA.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- E75L at 28,000 ft, 15 nm southwest, 6:31 pm PDT (01:31 UTC): moderate turbulence, remarks: ZDVWC-03. 797 nm along the route, 15 nm southwest of the line.
as filed, and in English
EEO UA /OV EKR085036/TM 0131/FL280/TP E75L/TB MOD/RM ZDVWC-03
- Report
- a routine report filed through EEO
- Where
- 36 nm east (085°) of EKR
- Time
- 01:31 UTC
- Height
- at 28,000 ft
- Aircraft
- E75L
- Turbulence
- moderate
- Remarks
- ZDVWC-03
- B39M at 32,000 ft, 21 nm northeast, 4:58 pm PDT (23:58 UTC): moderate chop turbulence, no icing, remarks: moderate mtw a 30-knot loss of airspeed ZDVWC-14. 807 nm along the route, 21 nm northeast of the line.
as filed, and in English
EEO UA /OV EKR069073/TM 2358/FL320/TP B39M/TB OCNL MOD CHOP/IC NEG/RM MOD MTW +/-30KT ZDVWC-14
- Report
- a routine report filed through EEO
- Where
- 73 nm east (069°) of EKR
- Time
- 23:58 UTC
- Height
- at 32,000 ft
- Aircraft
- B39M
- Turbulence
- occasional moderate chop
- Icing
- none
- Remarks
- moderate mtw a 30-knot loss of airspeed ZDVWC-14
- C650 at 40,000 ft, 35 nm southwest, 4:48 pm PDT (23:48 UTC): moderate turbulence, remarks: ZDVWC-03. 827 nm along the route, 35 nm southwest of the line.
as filed, and in English
ASE UA /OV DBL/TM 2348/FL400/TP C650/TB MOD /RM ZDVWC-03
- Report
- a routine report filed through ASE
- Where
- over DBL
- Time
- 23:48 UTC
- Height
- at 40,000 ft
- Aircraft
- C650
- Turbulence
- moderate
- Remarks
- ZDVWC-03
- BCS1 at 24,000 ft, 37 nm northeast, 6:30 pm PDT (01:30 UTC): moderate turbulence from 22,000 ft to 24,000 ft, remarks: during the climb ZDVWC-05. 867 nm along the route, 37 nm northeast of the line.
as filed, and in English
DEN UA /OV DVV270030/TM 0130/FL240/TP BCS1/TB MOD 220-240/RM DURC ZDVWC-05
- Report
- a routine report filed through DEN
- Where
- 30 nm west (270°) of DVV
- Time
- 01:30 UTC
- Height
- at 24,000 ft
- Aircraft
- BCS1
- Turbulence
- moderate from 22,000 ft to 24,000 ft
- Remarks
- during the climb ZDVWC-05
- SB20 at 16,000 ft, 43 nm northeast, 6:52 pm PDT (01:52 UTC): remarks: zse. At the departure end, 43 nm northeast of the line.
as filed, and in English
PAE UA /OV PAE075045/TM 0152/FL160/TP SB20/SK TOP120/RM ZSE
- Report
- a routine report filed through PAE
- Where
- 45 nm east (075°) of PAE
- Time
- 01:52 UTC
- Height
- at 16,000 ft
- Aircraft
- SB20
- Sky
- TOP120
- Remarks
- zse
- A321 at 13,500 ft, 17 nm south, 6:54 pm PDT (01:54 UTC): remarks: zse. 40 nm along the route, 17 nm south 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 15,000 ft, 17 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. 40 nm along the route, 17 nm south 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 south, 5:42 pm PDT (00:42 UTC): remarks: zse. 40 nm along the route, 17 nm south 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
- C337 at 12,000 ft, 27 nm south, 6:18 pm PDT (01:18 UTC): light rime icing, -12 °C, remarks: zse. 100 nm along the route, 27 nm south of the line.
as filed, and in English
YKM UA /OV YKM155020/TM 0118/FL120/TP C337/TA M12/IC LGT RIME/RM ZSE
- Report
- a routine report filed through YKM
- Where
- 20 nm southeast (155°) of YKM
- Time
- 01:18 UTC
- Height
- at 12,000 ft
- Aircraft
- C337
- Temperature
- −12 °C
- Icing
- light rime
- Remarks
- zse
- PC12 at 13,500 ft, 25 nm northeast, 6:08 pm PDT (01:08 UTC): no turbulence, a trace of icing, overcast from 9,000 ft to 13,500 ft, -10 °C. 139 nm along the route, 25 nm northeast of the line.
as filed, and in English
PSC UA /OV PSC360025/TM 0108/FL135/TP PC12/SK OVC090-TOP135/TA M10/TB NEG /IC TRACE RM 135-090
- Report
- a routine report filed through PSC
- Where
- 25 nm north (360°) of PSC
- Time
- 01:08 UTC
- Height
- at 13,500 ft
- Aircraft
- PC12
- Sky
- overcast from 9,000 ft, tops 13,500 ft
- Temperature
- −10 °C
- Turbulence
- none
- Icing
- trace remarks from 13,500 ft to 9,000 ft
- PC12 at 6,000 ft, 7 nm south, 5:56 pm PDT (00:56 UTC): overcast above 6,000 ft. 179 nm along the route, 7 nm south of the line.
as filed, and in English
ALW UA /OV ALW200015/TM 0056/FL060/TP PC12/SK OVC060
- Report
- a routine report filed through ALW
- Where
- 15 nm south (200°) of ALW
- Time
- 00:56 UTC
- Height
- at 6,000 ft
- Aircraft
- PC12
- Sky
- overcast from 6,000 ft
- PC12 at 6,000 ft, 33 nm southwest, 6:09 pm PDT (01:09 UTC): scattered clouds up to 6,000 ft, remarks: multiple scattered layers during the descent runway 31. 408 nm along the route, 33 nm southwest of the line.
as filed, and in English
SUN UA /OV KSUN/TM 0109/FL060/TP PC12/SK SCT-TOP060/WX FV05SM/RM MULTIPLE SCT LAYERS DURD RY31
- Report
- a routine report filed through SUN
- Where
- over KSUN
- Time
- 01:09 UTC
- Height
- at 6,000 ft
- Aircraft
- PC12
- Sky
- scattered clouds, tops 6,000 ft
- Weather
- flight visibility 5 miles
- Remarks
- multiple scattered layers during the descent runway 31
- E550 at 21,000 ft, 33 nm southwest, 4:27 pm PDT (23:27 UTC): light turbulence, a few clouds above 7,000 ft, remarks: during the climb zlc. 408 nm along the route, 33 nm southwest of the line.
as filed, and in English
SUN UA /OV SUN/TM 2327/FL210/TP E550/SK FEW070/TB CONS LGT/RM DURC /ZLC
- Report
- a routine report filed through SUN
- Where
- over SUN
- Time
- 23:27 UTC
- Height
- at 21,000 ft
- Aircraft
- E550
- Sky
- a few clouds from 7,000 ft
- Turbulence
- continuous light
- Remarks
- during the climb zlc
- PC12 at 15,000 ft, 36 nm northeast, 4:47 pm PDT (23:47 UTC): light rime icing above 15,000 ft. 538 nm along the route, 36 nm northeast of the line.
as filed, and in English
JAC UA /OV JAC200025/TM 2347/FL150/TP PC12/IC LGT RIME 150 /ZLC
- Report
- a routine report filed through JAC
- Where
- 25 nm south (200°) of JAC
- Time
- 23:47 UTC
- Height
- at 15,000 ft
- Aircraft
- PC12
- Icing
- light rime at 15,000 ft zlc
14 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, LWS, BOI, PIH, RKS, GJT, DEN, PUB). 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 | 350° at 8 kt | −5 kt | 4 °C | 125 kt | 7 h 25 min | 3:35 am MDT (09:35 UTC) |
| 7,500 ft | 210° at 9 kt | +3 kt | 3 °C | 117 kt | 7 h 55 min | 4:05 am MDT (10:05 UTC) |
| 9,500 ft | 200° at 11 kt | +3 kt | 0 °C | 117 kt | 7 h 55 min | 4:05 am MDT (10:05 UTC) |
| 11,500 ft | 210° at 18 kt | +3 kt | -4 °C | 117 kt | 7 h 55 min | 4:05 am MDT (10:05 UTC) |
| 13,500 ft | 210° at 23 kt | +3 kt | -6 °C | 117 kt | 7 h 55 min | 4:05 am MDT (10:05 UTC) |
| 15,500 ft | 210° at 26 kt | +3 kt | -10 °C | 117 kt | 7 h 55 min | 4:05 am MDT (10:05 UTC) |
| 17,500 ft | 210° at 30 kt | +3 kt | -14 °C | 117 kt | 7 h 55 min | 4:05 am MDT (10:05 UTC) |
| 18,000 ft FL180 | 210° at 31 kt | +3 kt | -15 °C | 117 kt | 7 h 55 min | 4:05 am MDT (10:05 UTC) |
| 24,000 ft FL240 | 210° at 33 kt | +2 kt | -24 °C | 118 kt | 7 h 51 min | 4:01 am MDT (10:01 UTC) |
| 30,000 ft FL300 | 220° at 38 kt | 0 | -34 °C | 120 kt | 7 h 44 min | 3:54 am MDT (09:54 UTC) |
| 34,000 ft FL340 | 230° at 47 kt | −11 kt | -37 °C | 131 kt | 7 h 05 min | 3:15 am MDT (09:15 UTC) |
| 39,000 ft FL390 | 240° at 50 kt | −20 kt | -44 °C | 140 kt | 6 h 37 min | 2:47 am MDT (08:47 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; 25 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; 19 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° |
| LWS | used from 149 nm out; 69 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° |
| BOI | used from 299 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° | |
| PIH | used from 399 nm out; 72 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° | |
| RKS | used from 598 nm out; 44 nm from the line | 190/43 | 210/65 3° | 210/57 -9° | 210/56 -21° | 210/47 -33° | 230/63 -37° | 240/77 -46° | ||
| GJT | used from 747 nm out; 96 nm from the line | 210/40 11° | 210/46 3° | 210/61 -10° | 210/68 -22° | 220/57 -29° | 230/59 -36° | 240/66 -46° | ||
| DEN | used from 797 nm out; 82 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° | ||
| PUB | used from 897 nm out; 46 nm from the line | 210/24 16° | 210/28 8° | 230/43 -8° | 240/42 -21° | 240/77 -30° | 240/72 -36° | 250/51 -47° |
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 | no report just now | 432 ft | ||||
| YKM Yakima, WA | 90 nm out, 12 nm southwest of the line, tower | no report just now | 1,098 ft | ||||
| PSC Pasco, WA | 149 nm out, 1 nm north of the line, tower | no report just now | 410 ft | ||||
| ALW Walla Walla, WA | 189 nm out, 11 nm north of the line, tower | no report just now | 1,194 ft | ||||
| MYL Mc Call, ID | 299 nm out, 5 nm south of the line | no report just now | 5,024 ft | ||||
| AOC Arco, ID | 438 nm out, 6 nm south of the line | no report just now | 5,334 ft | ||||
| PIH Pocatello, ID | 488 nm out, 21 nm southwest of the line, tower | no report just now | 4,451 ft | ||||
| AFO Afton, WY | 558 nm out, 12 nm northeast of the line | no report just now | 6,220 ft | ||||
| RKS Rock Springs, WY | 668 nm out, 7 nm northeast of the line | no report just now | 6,764 ft | ||||
| CAG Craig, CO | 757 nm out, 5 nm south of the line | no report just now | 6,197 ft | ||||
| GNB Granby, CO | 837 nm out, 24 nm northeast of the line | no report just now | 8,207 ft | ||||
| COS Colorado Springs, CO | destination | no report just now | 6,187 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 COS when you get there the forecast at the estimated arrival, 2:47 am MDT (08:47 UTC)
COS has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/8784 LAKE GEORGE, CO, Sunday, October 11, 2026 through Tuesday, October 13, 2026 UTC 11 nm from the route, at the destination end · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 13 October · ZDV
- 6/8770 COLORADO SPRINGS, CO, Saturday, October 10, 2026 through Monday, October 12, 2026 UTC 1 nm from the route, at the destination end · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 12 October · ZDV
Daylight
Sunset at SEA 6:27 pm PDT (01:27 UTC), at COS 6:25 pm MDT (00:25 UTC) (civil twilight ends 6:51 pm MDT (00:51 UTC)). At 120 knots the arrival at COS is before sunrise there (7:04 am MDT (13:04 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: Seattle-Tacoma International, City Of Colorado Springs Municipal.