Plan a flight · Sun 6:39 pm PDT (01:39 UTC)

Seattle-Tacoma International to Northern Colorado Regional SEA → FNL

855 nautical miles (984 statute miles) southeast on a straight line, true course 113°, about 097° magnetic at the departure end (variation 16E). At 120 knots that is 5 h 59 min at the quickest height in today's winds (39,000 ft, a 23-knot tailwind), arriving about 1:38 am MDT (07:38 UTC), after sunset at the destination. Right now SEA is VFR, wind from the north (350°) at 11 knots; FNL is VFR, wind from the south-southwest (200°) at 7 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: 2 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 3W: thunderstorms (a convective SIGMET) up to 31,000 ft, moving from the southwest at 40 knots, until 7:55 pm PDT (02:55 UTC). Near the route, 636 nm along the route.
as issued
```
WSUS33 KKCI 120055
MKCW WST 120055
CONVECTIVE SIGMET 3W
VALID UNTIL 0255Z
MT WY
FROM 10WSW MLS-70E DDY-20N LAR-50E BPI-30NE BIL-10WSW MLS
AREA TS MOV FROM 22040KT. TOPS TO FL310.
```
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 129 nm of the route.
AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 99 to 328 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 179 to 716 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 567 nm of the route.
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 328 to 636 nm out.
AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 338 to 706 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 338 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 537 to 825 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 676 to 736 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Near the route, at the destination end.

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

B738 at 33,000 ft, 40 nm northeast, 4:57 pm PDT (23:57 UTC): moderate chop turbulence from 31,000 ft to 33,000 ft. 467 nm along the route, 40 nm northeast of the line.
as filed, and in English
```
IDA UA /OV DBS015030/TM 2357/FL330/TP B738/TB MOD CHOP 310-330 /ZLC
```
Report
a routine report filed through IDA
Where
30 nm north (015°) of DBS
Time
23:57 UTC
Height
at 33,000 ft
Aircraft
B738
Turbulence
moderate chop from 31,000 ft to 33,000 ft zlc
CRJ2 at 19,000 ft, 9 nm south, 5:47 pm PDT (00:47 UTC): moderate chop turbulence, remarks: ZDVWC-13. 805 nm along the route, 9 nm south of the line.
as filed, and in English
```
EGE UA /OV RLG010052/TM 0047/FL190/TP CRJ2/TB COSN MOD CHOP/RM ZDVWC-13
```
Report
a routine report filed through EGE
Where
52 nm north (010°) of RLG
Time
00:47 UTC
Height
at 19,000 ft
Aircraft
CRJ2
Turbulence
cosn moderate chop
Remarks
ZDVWC-13
B39M at 32,000 ft, 42 nm southwest, 4:58 pm PDT (23:58 UTC): moderate chop turbulence, no icing, remarks: moderate mtw a 30-knot loss of airspeed ZDVWC-14. 805 nm along the route, 42 nm southwest 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
BCS3 at 24,000 ft, 6 nm south, 4:28 pm PDT (23:28 UTC): moderate turbulence from 22,000 ft to 24,000 ft, remarks: during the descent. At the destination end, 6 nm south of the line.
as filed, and in English
```
DEN UA /OV DEN320045/TM 2328/FL240/TP BCS3/TB MOD 240-220/RM DURD
```
Report
a routine report filed through DEN
Where
45 nm northwest (320°) of DEN
Time
23:28 UTC
Height
at 24,000 ft
Aircraft
BCS3
Turbulence
moderate from 24,000 ft to 22,000 ft
Remarks
during the descent
BCS1 at 24,000 ft, 32 nm south, 6:30 pm PDT (01:30 UTC): moderate turbulence from 22,000 ft to 24,000 ft, remarks: during the climb ZDVWC-05. At the destination end, 32 nm south 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
PC12 at 13,000 ft, 21 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. 40 nm along the route, 21 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
PC12 at 15,000 ft, 21 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. 40 nm along the route, 21 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
C337 at 12,000 ft, 35 nm southwest, 6:18 pm PDT (01:18 UTC): light rime icing, -12 °C, remarks: zse. 99 nm along the route, 35 nm southwest 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, 15 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, 15 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, 21 nm south, 5:56 pm PDT (00:56 UTC): overcast above 6,000 ft. 179 nm along the route, 21 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
A320 descending, 19 nm northeast, 5:54 pm PDT (00:54 UTC): overcast above 7,500 ft, remarks: braking action good during the descent RY19. 537 nm along the route, 19 nm northeast of the line.
as filed, and in English
```
JAC UA /OV JAC/TM 0054/FLUNKN/TP A320/SK OVC075/RM BRAKING ACTION GOOD DURD RY19
```
Report
a routine report filed through JAC
Where
over JAC
Time
00:54 UTC
Height
height not given
Aircraft
A320
Sky
overcast from 7,500 ft
Remarks
braking action good during the descent RY19
PC12 at 15,000 ft, 6 nm southwest, 4:47 pm PDT (23:47 UTC): light rime icing above 15,000 ft. 537 nm along the route, 6 nm southwest 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
CRJ7 at 17,000 ft, 4 nm southwest, 4:03 pm PDT (23:03 UTC): light rime icing, -6 °C. 557 nm along the route, 4 nm southwest of the line.
as filed, and in English
```
JAC UA /OV JAC160030/TM 2303/FL170/TP CRJ7/TA M6/IC LGT RIME /ZLC
```
Report
a routine report filed through JAC
Where
30 nm south (160°) of JAC
Time
23:03 UTC
Height
at 17,000 ft
Aircraft
CRJ7
Temperature
−6 °C
Icing
light rime zlc
UAL2395 at 37,000 ft, 44 nm southwest, 5:58 pm PDT (00:58 UTC): no turbulence, wind 240° at 70 knots. 666 nm along the route, 44 nm southwest of the line.
as filed, and in English
```
ARP UAL2395 4135N 10900W 0058 F370 240/070KT TB NONE SK CLEAR IC NONE
```
Report
a routine report filed through ARP

4 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, DLN, PIH, LND, RKS, DEN). 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	010° at 9 kt	−3 kt	4 °C	123 kt	6 h 57 min	2:36 am MDT (08:36 UTC)
7,500 ft	170° at 8 kt	+6 kt	2 °C	114 kt	7 h 30 min	3:09 am MDT (09:09 UTC)
9,500 ft	180° at 9 kt	+6 kt	-1 °C	114 kt	7 h 30 min	3:09 am MDT (09:09 UTC)
11,500 ft	200° at 17 kt	+6 kt	-4 °C	114 kt	7 h 30 min	3:09 am MDT (09:09 UTC)
13,500 ft	200° at 21 kt	+5 kt	-6 °C	115 kt	7 h 26 min	3:05 am MDT (09:05 UTC)
15,500 ft	200° at 24 kt	+4 kt	-10 °C	116 kt	7 h 22 min	3:01 am MDT (09:01 UTC)
17,500 ft	210° at 27 kt	+3 kt	-14 °C	117 kt	7 h 18 min	2:57 am MDT (08:57 UTC)
18,000 ft FL180	210° at 27 kt	+3 kt	-15 °C	117 kt	7 h 18 min	2:57 am MDT (08:57 UTC)
24,000 ft FL240	210° at 31 kt	+2 kt	-24 °C	118 kt	7 h 15 min	2:54 am MDT (08:54 UTC)
30,000 ft FL300	210° at 34 kt	+2 kt	-35 °C	118 kt	7 h 15 min	2:54 am MDT (08:54 UTC)
34,000 ft FL340	230° at 45 kt	−14 kt	-38 °C	134 kt	6 h 23 min	2:02 am MDT (08:02 UTC)
39,000 ft FL390	240° at 50 kt	−23 kt	-44 °C	143 kt	5 h 59 min	1:38 am MDT (07:38 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; 23 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; 60 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 298 nm out; 101 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°
DLN	used from 348 nm out; 79 nm from the line			080/10 -3°	180/8 -3°	180/23 -14°	200/58 -22°	200/80 -36°	220/85 -41°	230/81 -45°
PIH	used from 447 nm out; 62 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°
LND	used from 547 nm out; 70 nm from the line			180/33 10°	190/50 3°	210/59 -9°	200/50 -21°	190/41 -34°	230/55 -39°	240/65 -47°
RKS	used from 696 nm out; 72 nm from the line			190/43	210/65 3°	210/57 -9°	210/56 -21°	210/47 -33°	230/63 -37°	240/77 -46°
DEN	used from 795 nm out; 71 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°

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 5,000 feet	from the north (350°) at 11 knots	10+ mi	none	432 ft	5:53 pm PDT (00:53 UTC)
ELN Ellensburg, WA	80 nm out, 7 nm north of the line	VFR Sky: overcast at 9,000 feet	from the north-northeast (020°) at 4 knots	10+ mi	9,000 ft	1,763 ft	00:53 UTC
PSC Pasco, WA	149 nm out, 11 nm southwest of the line, tower	VFR Sky: overcast at 9,500 feet	from the northeast (040°) at 11 knots	10+ mi	9,500 ft	410 ft	00:53 UTC
ALW Walla Walla, WA	189 nm out, 7 nm southwest of the line, tower	VFR Sky: overcast at 5,000 feet	from the south-southwest (210°) at 3 knots	10+ mi	5,000 ft	1,194 ft	00:53 UTC
LLJ Challis, ID	378 nm out, 10 nm south of the line	marginal VFR Sky: overcast at 2,600 feet Weather: light rain	from the north-northwest (340°) at 11 knots	10+ mi	2,600 ft	5,075 ft	00:55 UTC
IDA Idaho Falls, ID	487 nm out, 17 nm south of the line, tower	IFR Sky: a broken layer at 700 feet, a broken layer at 3,200 feet, overcast at 4,000 feet Weather: light rain	from the south-southeast (150°) at 6 knots	10+ mi	700 ft	4,743 ft	01:31 UTC
JAC Jackson, WY	537 nm out, 18 nm northeast of the line, tower	marginal VFR Sky: a few clouds at 500 feet, a broken layer at 1,100 feet, overcast at 3,500 feet Weather: heavy rain, mist	from the west-northwest (290°) at 5 knots	3 mi	1,100 ft	6,451 ft	00:56 UTC
LND Lander, WY	636 nm out, 25 nm northeast of the line	IFR Sky: a broken layer at 700 feet, overcast at 1,200 feet	from the northwest (310°) at 7 knots	10+ mi	700 ft	5,588 ft	01:33 UTC
SAA Saratoga, WY	756 nm out, 3 nm north of the line	reported, no category	from the south (170°) at 11 knots, gusting to 16	10+ mi	none	7,014 ft	01:10 UTC
FNL Fort Collins/Loveland, CO	destination	VFR	from the south-southwest (200°) at 7 knots	10+ mi	none	5,020 ft	6:56 pm MDT (00:56 UTC)

The highest airport on this list sits at 7,014 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At FNL when you get there the forecast at the estimated arrival, 1:38 am MDT (07:38 UTC)

FNL has no terminal forecast; use the nearest airport that does.

The forecast for SEA, the departure

From Sun 5:00 pm PDT (00:00 UTC): wind from the north at 12 knots, gusting to 20, visibility more than 6 miles, a few clouds at 2,000 feet, a few clouds at 5,000 feet
From Sun 8:00 pm PDT (03:00 UTC): wind from the northeast 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

No temporary flight restriction on or near this route right now.

Daylight

Sunset at SEA 6:27 pm PDT (01:27 UTC), at FNL 6:24 pm MDT (00:24 UTC) (civil twilight ends 6:52 pm MDT (00:52 UTC)). At 120 knots the arrival at FNL is before sunrise there (7:07 am MDT (13:07 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 northern Rockies · loop National Weather Service

Radar now, the southern Rockies · 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, Northern Colorado Regional.