Plan a flight · Mon 12:06 am MDT (06:06 UTC)

Bozeman Yellowstone International to Buffalo Niagara International BZN → BUF

1,392 nautical miles (1,602 statute miles) east on a straight line, true course 085°, about 072° magnetic at the departure end (variation 13E). At 120 knots that is 7 h 47 min at the quickest height in today's winds (39,000 ft, a 59-knot tailwind), arriving about 9:53 am EDT (13:53 UTC). Right now BZN is low IFR, wind from the west (270°) at 5 knots; BUF is VFR, wind from the south (170°) at 3 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

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 first 646 nm of the route.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the first 109 nm of the route.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Near the route, at the departure end.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the first 99 nm of the route.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 119 to 229 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 189 to 239 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). Near the route, 219 nm along the route.
AIRMET TANGO 3W: 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 845 to 965 nm out.
AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 1114 to 1233 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 BZN.

Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first

urgent B39M at 35,000 ft, 45 nm south, 9:15 pm MDT (03:15 UTC): remarks: no inj/dmg zob. At the destination end, 45 nm south of the line.
as filed, and in English
```
DKK UUA /OV DKK280040/TM 0315/FL350/TP B39M/TB MTN WVE ACTN +/-5KTS/RM NO INJ/DMG ZOB
```
Report
an urgent report filed through DKK
Where
40 nm west (280°) of DKK
Time
03:15 UTC
Height
at 35,000 ft
Aircraft
B39M
Turbulence
mountain wve actn a 5-knot loss of airspeed
Remarks
no inj/dmg zob
B737 , 0 nm northwest, 11:31 pm MDT (05:31 UTC): remarks: saw the light at 500FT braking good no icing. At the departure end, 0 nm northwest of the line.
as filed, and in English
```
BZN UA /OV BZN/TM 0531/FLBURD/TP B737/RM SAW THE LIGHT AT 500FT. BRAKING GOOD. NEG ICING
```
Report
a routine report filed through BZN
Where
over BZN
Time
05:31 UTC
Height
at BURD
Aircraft
B737
Remarks
saw the light at 500FT braking good no icing
GLF5 descending, 0 nm northwest, 9:46 pm MDT (03:46 UTC): remarks: broke out 100-150FT above ground. At the departure end, 0 nm northwest of the line.
as filed, and in English
```
BZN UA /OV BZN/TM 0346/FLDURD/TP GLF5/RM BROKE OUT 100-150FT AGL
```
Report
a routine report filed through BZN
Where
over BZN
Time
03:46 UTC
Height
during the descent
Aircraft
GLF5
Remarks
broke out 100-150FT above ground

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 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 10 forecast points nearest it (BIL, MLS, DIK, ABR, AXN, MSP, LSE, GRB, TVC, BUF). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
3,500 ft	250° at 15 kt	−13 kt		133 kt	10 h 28 min	12:34 pm EDT (16:34 UTC)
5,500 ft	230° at 9 kt	−7 kt	4 °C	127 kt	10 h 58 min	1:04 pm EDT (17:04 UTC)
7,500 ft	240° at 12 kt	−10 kt	10 °C	130 kt	10 h 42 min	12:48 pm EDT (16:48 UTC)
9,500 ft	230° at 16 kt	−13 kt	7 °C	133 kt	10 h 28 min	12:34 pm EDT (16:34 UTC)
11,500 ft	230° at 23 kt	−18 kt	4 °C	138 kt	10 h 05 min	12:11 pm EDT (16:11 UTC)
13,500 ft	240° at 25 kt	−22 kt	0 °C	142 kt	9 h 48 min	11:54 am EDT (15:54 UTC)
15,500 ft	250° at 27 kt	−25 kt	-5 °C	145 kt	9 h 36 min	11:42 am EDT (15:42 UTC)
17,500 ft	250° at 29 kt	−28 kt	-9 °C	148 kt	9 h 24 min	11:30 am EDT (15:30 UTC)
18,000 ft FL180	250° at 29 kt	−29 kt	-10 °C	149 kt	9 h 21 min	11:27 am EDT (15:27 UTC)
24,000 ft FL240	250° at 31 kt	−31 kt	-21 °C	151 kt	9 h 13 min	11:19 am EDT (15:19 UTC)
30,000 ft FL300	260° at 33 kt	−34 kt	-36 °C	154 kt	9 h 02 min	11:08 am EDT (15:08 UTC)
34,000 ft FL340	260° at 43 kt	−45 kt	-44 °C	165 kt	8 h 26 min	10:32 am EDT (14:32 UTC)
39,000 ft FL390	270° at 58 kt	−59 kt	-50 °C	179 kt	7 h 47 min	9:53 am EDT (13:53 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
BIL	used from 0 nm out; 84 nm from the line		080/13	180/9 -2°	210/38 0°	220/51 -11°	210/46 -22°	210/58 -35°	230/73 -39°	230/72 -45°
MLS	used from 149 nm out; 55 nm from the line		150/23 2°	190/29 4°	210/44 2°	220/32 -10°	210/36 -21°	200/48 -37°	230/63 -40°	240/71 -47°
DIK	used from 298 nm out; 57 nm from the line		150/24 7°	200/38 6°	220/53 0°	230/51 -9°	230/49 -21°	240/37 -37°	240/47 -44°	250/65 -48°
ABR	used from 448 nm out; 65 nm from the line	070/14	250/10 17°	270/16 11°	260/28 5°	260/36 -10°	260/41 -22°	270/33 -37°	260/42 -42°	260/50 -48°
AXN	used from 597 nm out; 40 nm from the line	100/14	250/21 14°	240/24 12°	240/31 5°	260/36 -10°	260/40 -21°	250/42 -36°	260/48 -45°	260/53 -50°
MSP	used from 696 nm out; 47 nm from the line	230/26	240/30 17°	240/24 12°	250/22 5°	250/35 -10°	260/36 -21°	250/41 -36°	250/49 -45°	260/58 -52°
LSE	used from 845 nm out; 80 nm from the line	230/40	240/24 17°	240/13 10°	250/13 6°	280/22 -9°	250/28 -21°	250/41 -34°	260/42 -44°	270/62 -53°
GRB	used from 895 nm out; 57 nm from the line	250/36	270/23 16°	270/14 9°	240/18 4°	280/26 -9°	280/29 -20°	290/42 -36°	290/51 -45°	290/72 -55°
TVC	used from 1044 nm out; 24 nm from the line	260/31	280/22 15°	290/18 10°	270/13 2°	290/25 -10°	300/35 -21°	310/52 -37°	320/59 -47°	300/84 -54°
BUF	used from 1243 nm out; 124 nm from the line	320/10	010/16 10°	360/10 6°	340/13 2°	330/22 -11°	300/25 -23°	320/31 -38°	300/29 -44°	280/36 -50°

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
BZN Bozeman, MT	departure	low IFR Sky: overcast at 200 feet Weather: light snow, mist	from the west (270°) at 5 knots	2.5 mi	200 ft	4,473 ft	11:56 pm MDT (05:56 UTC)
BIL Billings, MT	109 nm out, 5 nm south of the line, tower	marginal VFR Sky: overcast at 1,200 feet Weather: light rain, light snow, mist	from the north-northwest (340°) at 6 knots	3 mi	1,200 ft	3,662 ft	05:53 UTC
LEM Lemmon, SD	378 nm out, 1 nm south of the line	no report just now				2,572 ft
ASY Ashley, ND	497 nm out, 12 nm north of the line	no report just now				2,034 ft
MOX Morris, MN	637 nm out, 4 nm south of the line	marginal VFR Weather: mist	from the northwest (320°) at 10 knots	4 mi	none	1,135 ft	05:15 UTC
STC St Cloud, MN	716 nm out, 4 nm north of the line, tower	VFR	from the north (360°) at 4 knots	10+ mi	none	1,030 ft	05:53 UTC
CWA Mosinee, WI	905 nm out, 12 nm south of the line, tower	VFR Sky: scattered clouds at 24,000 feet	from the south (190°) at 6 knots	10+ mi	none	1,277 ft	05:55 UTC
GRB Green Bay, WI	975 nm out, 16 nm south of the line, tower	VFR	from the south (190°) at 6 knots	10+ mi	none	695 ft	05:53 UTC
BAX Bad Axe, MI	1203 nm out, 6 nm southwest of the line	IFR Sky: overcast at 700 feet	from the southwest (230°) at 6 knots	10+ mi	700 ft	763 ft	05:55 UTC
CYSN St Catharines,	1373 nm out, 9 nm north of the line	VFR Sky: a broken layer at 5,000 feet	from the east (080°) at 6 knots	15 mi	5,000 ft	321 ft	01:00 UTC
BUF Buffalo, NY	destination	VFR Sky: scattered clouds at 12,000 feet, a broken layer at 14,000 feet	from the south (170°) at 3 knots	10+ mi	14,000 ft	726 ft	1:54 am EDT (05:54 UTC)

The highest airport on this list sits at 4,473 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BUF when you get there the forecast at the estimated arrival, 9:53 am EDT (13:53 UTC)

Wind calm, visibility 5 miles, mist, overcast at 300 feet low IFR

The whole forecast for BUF

From Mon 2:00 am EDT (06:00 UTC): wind light and variable, visibility 4 miles, mist, overcast at 2,000 feet
From Mon 5:00 am EDT (09:00 UTC): wind calm, visibility 5 miles, mist, overcast at 300 feet
From Mon 10:00 am EDT (14:00 UTC): wind from the west-southwest at 5 knots, visibility more than 6 miles, overcast at 700 feet
From Mon 1:00 pm EDT (17:00 UTC): wind from the west-southwest at 9 knots, visibility more than 6 miles, overcast at 1,500 feet
From Tue 1:00 am EDT (05:00 UTC): wind from the southwest at 6 knots, visibility more than 6 miles, low-level wind shear, a few clouds at 12,000 feet

The forecast for BZN, the departure

From Mon 12:00 am MDT (06:00 UTC): wind light and variable, visibility 2 miles, light snow, a broken layer at 200 feet, overcast at 1,000 feet
From Mon 3:00 am MDT (09:00 UTC): wind light and variable, visibility 6 miles, mist, overcast at 800 feet
From Mon 10:00 am MDT (16:00 UTC): wind light and variable, visibility more than 6 miles, scattered clouds at 800 feet, overcast at 1,000 feet
From Mon 2:00 pm MDT (20:00 UTC): wind light and variable, visibility more than 6 miles, scattered clouds at 800 feet, a broken layer at 1,500 feet
From Mon 6:00 pm MDT (00:00 UTC): wind light and variable, visibility 6 miles, mist, scattered clouds at 800 feet, a broken layer at 2,000 feet

Temporary flight restrictions on the line or within 25 nm of it

6/6656 ANOKA, MN, Monday, October 5, 2026 through Monday, October 19, 2026 Local 12 nm from the route, 746 nm along the route · security · until 19 October · ZMP

Daylight

Sunset at BZN 6:42 pm MDT (00:42 UTC), at BUF 6:37 pm EDT (22:37 UTC) (civil twilight ends 7:06 pm EDT (23:06 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 northern Rockies · loop National Weather Service

Radar now, the upper Mississippi valley · loop National Weather Service

Radar now, the central Great Lakes · 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: Bozeman Yellowstone International, Buffalo Niagara International.