Plan a flight · Tue 1:05 am MDT (07:05 UTC)

Billings Logan International to Spokane International BIL → GEG

386 nautical miles (444 statute miles) west on a straight line, true course 290°, about 280° magnetic at the departure end (variation 10E). At 120 knots that is 3 h 20 min at the quickest height in today's winds (24,000 ft, a 4-knot headwind), arriving about 3:25 am PDT (10:25 UTC), after sunset at the destination. Right now BIL is marginal VFR, wind from the north (010°) at 3 knots; GEG is VFR, wind from the south-southeast (150°) at 4 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: 28 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 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 10 to 89 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 277 to 306 nm out.

Turbulence AIRMET in force: moderate turbulence from 18,000 ft to 39,000 ft, over the route from 277 to 306 nm out. No pilot has reported turbulence near the line in the last three hours. The government's turbulence forecast map ↗

Icing No icing warning in force along the route. No pilot has reported icing near the line in the last three hours. The freezing level is below 4,500 ft, the lowest forecast height, so any cloud could carry ice. The government's icing forecast map ↗

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 BIL.

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 02:00–09:00 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 4 forecast points nearest it (BIL, GTF, GPI, GEG). 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	280° at 8 kt	+8 kt	0 °C	112 kt	3 h 27 min	3:32 am PDT (10:32 UTC)
6,500 ft	280° at 8 kt	+8 kt	0 °C	112 kt	3 h 27 min	3:32 am PDT (10:32 UTC)
8,500 ft	280° at 9 kt	+9 kt	-2 °C	111 kt	3 h 29 min	3:34 am PDT (10:34 UTC)
10,500 ft	280° at 8 kt	+8 kt	-1 °C	112 kt	3 h 27 min	3:32 am PDT (10:32 UTC)
12,500 ft	290° at 6 kt	+6 kt	-4 °C	114 kt	3 h 23 min	3:28 am PDT (10:28 UTC)
14,500 ft	310° at 6 kt	+6 kt	-8 °C	114 kt	3 h 23 min	3:28 am PDT (10:28 UTC)
16,500 ft	320° at 6 kt	+5 kt	-13 °C	115 kt	3 h 21 min	3:26 am PDT (10:26 UTC)
18,000 ft FL180	330° at 7 kt	+5 kt	-16 °C	115 kt	3 h 21 min	3:26 am PDT (10:26 UTC)
24,000 ft FL240	320° at 6 kt	+4 kt	-28 °C	116 kt	3 h 20 min	3:25 am PDT (10:25 UTC)
30,000 ft FL300	360° at 14 kt	+4 kt	-40 °C	116 kt	3 h 20 min	3:25 am PDT (10:25 UTC)
34,000 ft FL340	330° at 8 kt	+5 kt	-45 °C	115 kt	3 h 21 min	3:26 am PDT (10:26 UTC)
39,000 ft FL390	220° at 22 kt	+10 kt	-45 °C	110 kt	3 h 31 min	3:36 am PDT (10:36 UTC)

Based on data from the 13th at 00:00 UTC; valid on the 13th 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	6,000	9,000	12,000	18,000	24,000	30,000	34,000	39,000
BIL	used from 0 nm out; 25 nm from the line	270/8	250/11 1°	230/15 -2°	260/18 -15°	220/45 -28°	230/53 -39°	220/48 -41°	220/51 -43°
GTF	used from 99 nm out; 61 nm from the line	260/12	270/12 0°	290/10 -3°	L/V -16°	270/12 -30°	250/6 -40°	240/23 -41°	220/24 -44°
GPI	used from 198 nm out; 86 nm from the line	270/11 0°	290/14 -2°	330/7 -3°	340/7 -17°	020/18 -28°	030/49 -41°	030/37 -47°	230/15 -45°
GEG	used from 297 nm out; 64 nm from the line	350/6 0°	350/6 -1°	360/8 -4°	020/24 -16°	030/45 -26°	020/57 -41°	020/53 -50°	340/6 -48°

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
BIL Billings, MT	departure	marginal VFR Sky: overcast at 1,400 feet	from the north (010°) at 3 knots	10+ mi	1,400 ft	3,662 ft	12:53 am MDT (06:53 UTC)
HWQ Harlowton, MT	59 nm out, 19 nm north of the line	no report just now				4,311 ft
HLN Helena, MT	148 nm out, 2 nm northwest of the line, tower	VFR	from the west (270°) at 3 knots	10+ mi	none	3,877 ft	06:53 UTC
MSO Missoula, MT	237 nm out, 6 nm southwest of the line, tower	VFR Sky: overcast at 4,100 feet	from the north (350°) at 3 knots	10+ mi	4,100 ft	3,205 ft	06:53 UTC
THM Thompson Falls, MT	297 nm out, 19 nm north of the line	no report just now				2,467 ft
COE Coeur D'Alene, ID	356 nm out, 16 nm north of the line	VFR	from the south-southeast (160°) at 5 knots	10+ mi	none	2,320 ft	06:56 UTC
GEG Spokane, WA	destination	VFR	from the south-southeast (150°) at 4 knots	10+ mi	none	2,385 ft	11:53 pm PDT (06:53 UTC)

The highest airport on this list sits at 4,311 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

The codes as issued, and in English, for every airport in the table

BIL Billings, MT