Denver International to Great Falls International DEN → GTF
542 nautical miles (623 statute miles) northwest on a straight line, true course 330°, about 322° magnetic at the departure end (variation 8E). At 120 knots that is 3 h 59 min at the quickest height in today's winds (39,000 ft, a 16-knot tailwind), arriving about 12:39 pm MDT (18:39 UTC). Right now DEN is VFR, wind from the southwest (220°) at 7 knots; GTF is low IFR, wind from the west-northwest (290°) at 5 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: 1,456 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 (due to mountain wave) from 34,000 ft to 43,000 ft. Over the first 197 nm of the route.
- AIRMET TANGO 2W: moderate turbulence below 18,000 ft (due to mountain wave) up to 22,000 ft. Over the first 158 nm of the route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 355 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 last 335 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 266 to 394 nm out.
- AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the last 138 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 DEN.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- urgent C172 at 6,700 ft, 19 nm southwest, 6:54 am MDT (12:54 UTC): remarks: low-level wind shear + 10 knots during the climb. At the departure end, 19 nm southwest of the line.
as filed, and in English
APA UUA /OV KAPA/TM 1254/FL067/TP C172/RM LLWS +/- 10 KTS DURC
- Report
- an urgent report filed through APA
- Where
- over KAPA
- Time
- 12:54 UTC
- Height
- at 6,700 ft
- Aircraft
- C172
- Remarks
- low-level wind shear + 10 knots during the climb
- urgent FA7X at 6,800 ft, 19 nm southwest, 6:40 am MDT (12:40 UTC): remarks: low-level wind shear a 40-knot loss of airspeed knots during the climb runway 35R. At the departure end, 19 nm southwest of the line.
as filed, and in English
APA UUA /OV KAPA/TM 1240/FL068/TP FA7X/RM LLWS -40 KTS DURC RY 35R
- Report
- an urgent report filed through APA
- Where
- over KAPA
- Time
- 12:40 UTC
- Height
- at 6,800 ft
- Aircraft
- FA7X
- Remarks
- low-level wind shear a 40-knot loss of airspeed knots during the climb runway 35R
- urgent TBM7 at 100 ft, 20 nm southwest, 6:30 am MDT (12:30 UTC): light chop turbulence, remarks: low-level wind shear a 10-knot loss of airspeed. At the departure end, 20 nm southwest of the line.
as filed, and in English
APA UUA /OV APA140001/TM 1230/FL001/TP TBM7/TB LGT CHOP/RM LLWS +-10KTS
- Report
- an urgent report filed through APA
- Where
- 1 nm southeast (140°) of APA
- Time
- 12:30 UTC
- Height
- at 100 ft
- Aircraft
- TBM7
- Turbulence
- light chop
- Remarks
- low-level wind shear a 10-knot loss of airspeed
- B38M at 12,000 ft, 26 nm east, 8:07 am MDT (14:07 UTC): moderate turbulence, remarks: from 11,000 ft to 12,000 ft. At the departure end, 26 nm east of the line.
as filed, and in English
DEN UA /OV DEN090025/TM 1407/FL120/TP B38M/TB MOD/RM 110-120
- Report
- a routine report filed through DEN
- Where
- 25 nm east (090°) of DEN
- Time
- 14:07 UTC
- Height
- at 12,000 ft
- Aircraft
- B38M
- Turbulence
- moderate
- Remarks
- from 11,000 ft to 12,000 ft
- B738 descending, 41 nm southwest, 6:55 am MDT (12:55 UTC): moderate turbulence from 16,000 ft to 20,000 ft. At the departure end, 41 nm southwest of the line.
as filed, and in English
DEN UA /OV 40SW DEN/TM 1255/FLDURD/TP B738/TB MOD 200-160
- Report
- a routine report filed through DEN
- Where
- 40SW den
- Time
- 12:55 UTC
- Height
- during the descent
- Aircraft
- B738
- Turbulence
- moderate from 20,000 ft to 16,000 ft
- C172 at 200 ft, 18 nm southwest, 6:35 am MDT (12:35 UTC): moderate turbulence, remarks: low-level wind shear a 15-knot loss of airspeed. At the departure end, 18 nm southwest of the line.
as filed, and in English
APA UA /OV APA350001/TM 1235/FL002/TP C172/TB MOD TURB/RM LLWS +-15KTS
- Report
- a routine report filed through APA
- Where
- 1 nm north (350°) of APA
- Time
- 12:35 UTC
- Height
- at 200 ft
- Aircraft
- C172
- Turbulence
- moderate turbulence
- Remarks
- low-level wind shear a 15-knot loss of airspeed
- B737 at 21,000 ft, 6 nm west, 8:05 am MDT (14:05 UTC): moderate turbulence, remarks: mountain wave a 30-knot gain of airspeed from 25,000 ft to 15,000 ft during the descent. At the departure end, 6 nm west of the line.
as filed, and in English
DEN UA /OV DEN310025/TM 1405/FL210/TP B737/TB MOD TURB/RM MTN WAVE +30KTS 250-150 DURD
- Report
- a routine report filed through DEN
- Where
- 25 nm northwest (310°) of DEN
- Time
- 14:05 UTC
- Height
- at 21,000 ft
- Aircraft
- B737
- Turbulence
- moderate turbulence
- Remarks
- mountain wave a 30-knot gain of airspeed from 25,000 ft to 15,000 ft during the descent
- B738 descending, 6 nm southwest, 7:01 am MDT (13:01 UTC): moderate turbulence from 11,000 ft to 20,000 ft. 39 nm along the route, 6 nm southwest of the line.
as filed, and in English
DEN UA /OV 40NW DEN/TM 1301/FLDURD/TP B738/TB MOD 200-110
- Report
- a routine report filed through DEN
- Where
- 40NW den
- Time
- 13:01 UTC
- Height
- during the descent
- Aircraft
- B738
- Turbulence
- moderate from 20,000 ft to 11,000 ft
- B737 at 16,000 ft, 3 nm south, 6:23 am MDT (12:23 UTC): moderate turbulence, remarks: during the descent. 39 nm along the route, 3 nm south of the line.
as filed, and in English
DEN UA /OV DEN320040/TM 1223/FL160/TP B737/TB MOD/RM DURD
- Report
- a routine report filed through DEN
- Where
- 40 nm northwest (320°) of DEN
- Time
- 12:23 UTC
- Height
- at 16,000 ft
- Aircraft
- B737
- Turbulence
- moderate
- Remarks
- during the descent
- E75L climbing, 3 nm south, 8:37 am MDT (14:37 UTC): light chop turbulence, remarks: zimmr sid. At the departure end, 3 nm south of the line.
as filed, and in English
DEN UA /OV W DEN/TM 1437/FLDURC/TP E75L/TB CONT LGT CHOP / MOD 120/RM ZIMMR SID
- Report
- a routine report filed through DEN
- Where
- west den
- Time
- 14:37 UTC
- Height
- during the climb
- Aircraft
- E75L
- Turbulence
- continuous light chop moderate at 12,000 ft
- Remarks
- zimmr sid
- B737 at 6,500 ft, 3 nm south, 8:32 am MDT (14:32 UTC): no turbulence. At the departure end, 3 nm south of the line.
as filed, and in English
DEN UA /OV DEN/TM 1432/FL065/TP B737/TB NEG TB ON FINAL RWY17R
- Report
- a routine report filed through DEN
- Where
- over DEN
- Time
- 14:32 UTC
- Height
- at 6,500 ft
- Aircraft
- B737
- Turbulence
- no turbulence on final runway 17R
- C172 at 7,800 ft, 24 nm south, 7:57 am MDT (13:57 UTC): light to moderate chop turbulence. At the departure end, 24 nm south of the line.
as filed, and in English
APA UA /OV APA150006/TM 1357/FL078/TP C172/TB LGT-MOD CHOP
- Report
- a routine report filed through APA
- Where
- 6 nm southeast (150°) of APA
- Time
- 13:57 UTC
- Height
- at 7,800 ft
- Aircraft
- C172
- Turbulence
- light to moderate chop
- CRJ2 at 7,000 ft, 3 nm south, 7:30 am MDT (13:30 UTC): no turbulence. At the departure end, 3 nm south of the line.
as filed, and in English
DEN UA /OV 5N/TM 1330/FL070/TP CRJ2/TB NEG
- Report
- a routine report filed through DEN
- Where
- 5N
- Time
- 13:30 UTC
- Height
- at 7,000 ft
- Aircraft
- CRJ2
- Turbulence
- none
- B737 descending, 26 nm southwest, 7:26 am MDT (13:26 UTC): light chop turbulence from 16,000 ft to 23,000 ft, wind 235° at 53 knots. At the departure end, 26 nm southwest of the line.
as filed, and in English
DEN UA /OV 25SW DEN/TM 1326/FLDURD/TP B737/WV 235/53/TB OCNL LGT CHOP 230-160
- Report
- a routine report filed through DEN
- Where
- 25SW den
- Time
- 13:26 UTC
- Height
- during the descent
- Aircraft
- B737
- Wind
- 235/53
- Turbulence
- occasional light chop from 23,000 ft to 16,000 ft
12 more routine reports are on the map.
Winds aloft along the route, and the time en route the forecast for use 14:00–21:00 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 5 forecast points nearest it (DEN, BFF, LND, BIL, GTF). 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 | 310° at 2 kt | +2 kt | 118 kt | 4 h 36 min | 1:16 pm MDT (19:16 UTC) | |
| 6,500 ft | 290° at 3 kt | +3 kt | 117 kt | 4 h 38 min | 1:18 pm MDT (19:18 UTC) | |
| 8,500 ft | 240° at 9 kt | +1 kt | 6 °C | 119 kt | 4 h 33 min | 1:13 pm MDT (19:13 UTC) |
| 10,500 ft | 240° at 15 kt | 0 | 1 °C | 120 kt | 4 h 31 min | 1:11 pm MDT (19:11 UTC) |
| 12,500 ft | 230° at 20 kt | −1 kt | -1 °C | 121 kt | 4 h 29 min | 1:09 pm MDT (19:09 UTC) |
| 14,500 ft | 230° at 23 kt | −4 kt | -6 °C | 124 kt | 4 h 22 min | 1:02 pm MDT (19:02 UTC) |
| 16,500 ft | 230° at 25 kt | −6 kt | -11 °C | 126 kt | 4 h 18 min | 12:58 pm MDT (18:58 UTC) |
| 18,000 ft FL180 | 220° at 28 kt | −7 kt | -14 °C | 127 kt | 4 h 16 min | 12:56 pm MDT (18:56 UTC) |
| 24,000 ft FL240 | 220° at 40 kt | −12 kt | -26 °C | 132 kt | 4 h 06 min | 12:46 pm MDT (18:46 UTC) |
| 30,000 ft FL300 | 220° at 56 kt | −13 kt | -34 °C | 133 kt | 4 h 05 min | 12:45 pm MDT (18:45 UTC) |
| 34,000 ft FL340 | 220° at 66 kt | −15 kt | -38 °C | 135 kt | 4 h 01 min | 12:41 pm MDT (18:41 UTC) |
| 39,000 ft FL390 | 220° at 68 kt | −16 kt | -44 °C | 136 kt | 3 h 59 min | 12:39 pm MDT (18:39 UTC) |
Based on data from the 12th at 12:00 UTC; valid on the 12th at 18:00 UTC for use 14:00 to 21:00 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; 25 nm from the line | 230/7 11° | 230/13 4° | 230/40 -9° | 230/48 -20° | 240/66 -32° | 240/88 -38° | 230/100 -47° | ||
| BFF | used from 98 nm out; 111 nm from the line | 310/15 | 280/27 8° | 250/27 2° | 230/30 -12° | 240/52 -22° | 250/66 -32° | 240/78 -37° | 240/76 -43° | |
| LND | used from 148 nm out; 97 nm from the line | 220/16 3° | 230/26 -1° | 210/30 -14° | 220/57 -26° | 220/60 -31° | 220/62 -38° | 220/52 -44° | ||
| BIL | used from 295 nm out; 84 nm from the line | L/V | 250/11 -1° | 240/20 -2° | 230/28 -15° | 220/28 -28° | 220/53 -34° | 220/55 -39° | 220/63 -44° | |
| GTF | used from 443 nm out; 74 nm from the line | L/V | L/V -4° | 230/12 -3° | 210/12 -17° | 190/23 -29° | 200/48 -39° | 210/69 -39° | 220/66 -42° |
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 |
|---|---|---|---|---|---|---|---|
| DEN Denver, CO | departure | VFR Sky: a few clouds at 8,000 feet, a few clouds at 12,000 feet | from the southwest (220°) at 7 knots | 10+ mi | none | 5,433 ft | 7:53 am MDT (13:53 UTC) |
| FNL Fort Collins/Loveland, CO | 39 nm out, 5 nm east of the line, tower | VFR | from the southeast (140°) at 8 knots | 8 mi | none | 5,020 ft | 13:56 UTC |
| LAR Laramie, WY | 98 nm out, 5 nm northeast of the line | VFR | from the southwest (220°) at 11 knots, gusting to 20 | 10+ mi | none | 7,283 ft | 13:53 UTC |
| CPR Casper, WY | 197 nm out, 24 nm northeast of the line, tower | IFR Sky: a broken layer at 600 feet, a broken layer at 4,900 feet | from the north (350°) at 9 knots | 10+ mi | 600 ft | 5,344 ft | 13:53 UTC |
| WRL Worland, WY | 286 nm out, 3 nm northeast of the line | marginal VFR Sky: overcast at 1,100 feet | from the north (350°) at 3 knots | 8 mi | 1,100 ft | 4,251 ft | 13:53 UTC |
| POY Powell, WY | 355 nm out, 3 nm southeast of the line | low IFR Sky: a broken layer at 300 feet, overcast at 2,500 feet Weather: mist | from the northwest (310°) at 14 knots | 5 mi | 300 ft | 5,096 ft | 14:10 UTC |
| HWQ Harlowton, MT | 453 nm out, 17 nm northeast of the line | no report just now | 4,311 ft | ||||
| GTF Great Falls, MT | destination | low IFR Sky: overcast at 400 feet Weather: mist | from the west-northwest (290°) at 5 knots | 0.25 mi | 400 ft | 3,680 ft | 7:53 am MDT (13:53 UTC) |
The highest airport on this list sits at 7,283 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At GTF when you get there the forecast at the estimated arrival, 12:39 pm MDT (18:39 UTC)
Wind light and variable, visibility more than 6 miles, a broken layer at 700 feet IFR
The whole forecast for GTF
- From Mon 8:00 am MDT (14:00 UTC): wind light and variable, visibility ¾ mile, mist, sky obscured at 300 feet
- At times between Mon 8:00 am MDT (14:00 UTC) and 10:00 am MDT (16:00 UTC): visibility 2 miles, mist, overcast at 400 feet
- From Mon 11:00 am MDT (17:00 UTC): wind light and variable, visibility more than 6 miles, a broken layer at 700 feet
- From Mon 10:00 pm MDT (04:00 UTC): wind from the south-southwest at 6 knots, visibility more than 6 miles, scattered clouds at 500 feet
The forecast for DEN, the departure
- From Mon 6:00 am MDT (12:00 UTC): wind from the south-southwest at 15 knots, visibility more than 6 miles, clear skies
- From Mon 10:00 am MDT (16:00 UTC): wind from the southwest at 14 knots, gusting to 21, visibility more than 6 miles, clear skies
- From Mon 7:00 pm MDT (01:00 UTC): wind from the south at 9 knots, visibility more than 6 miles, clear skies
- From Mon 11:00 pm MDT (05:00 UTC): wind from the north at 10 knots, visibility more than 6 miles, a few clouds at 2,000 feet, scattered clouds at 4,000 feet
- From Tue 4:00 am MDT (10:00 UTC): wind from the north-northeast at 8 knots, visibility more than 6 miles, a broken layer at 2,000 feet
- From Tue 10:00 am MDT (16:00 UTC): wind from the northeast at 7 knots, visibility more than 6 miles, a few clouds at 2,000 feet, a broken layer at 4,000 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 DEN 6:22 pm MDT (00:22 UTC), at GTF 6:41 pm MDT (00:41 UTC) (civil twilight ends 7:12 pm MDT (01:12 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: Denver International, Great Falls International.