Plan a flight · Sun 6:51 pm PDT (01:51 UTC)

Boeing Fld/King County International to Nashville International BFI → BNA

1,716 nautical miles (1,974 statute miles) east on a straight line, true course 100°, about 085° magnetic at the departure end (variation 15E). At 120 knots that is 10 h 48 min at the quickest height in today's winds (39,000 ft, a 39-knot tailwind), arriving about 7:39 am CDT (12:39 UTC). Right now BFI is VFR, wind from the northwest (310°) at 6 knots; BNA is VFR, wind variable 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: 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). Over the route from 598 to 748 nm out.
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 140 nm of the route.
AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 100 to 429 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 199 to 668 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 269 to 878 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 299 to 698 nm out.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 489 to 748 nm out.
AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 519 to 658 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). Over the route from 698 to 698 nm out.
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 1107 to 1307 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 BFI.

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

E75L at 14,000 ft, 20 nm northeast, 4:22 pm PDT (23:22 UTC): moderate turbulence from 14,000 ft to 21,000 ft, remarks: during the climb zlc. 339 nm along the route, 20 nm northeast of the line.
as filed, and in English
```
MSO UA /OV 32S/TM 2322/FL140/TP E75L/TB MOD 140-210/RM DURC /ZLC
```
Report
a routine report filed through MSO
Where
over 32S
Time
23:22 UTC
Height
at 14,000 ft
Aircraft
E75L
Turbulence
moderate from 14,000 ft to 21,000 ft
Remarks
during the climb zlc
PC12 at 15,000 ft, 34 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 34 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, 34 nm south, 5:42 pm PDT (00:42 UTC): remarks: zse. At the departure end, 34 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 13,500 ft, 23 nm south, 6:08 pm PDT (01:08 UTC): no turbulence, a trace of icing, overcast from 9,000 ft to 13,500 ft, -10 °C. 140 nm along the route, 23 nm south 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
C25B at 4,100 ft, 42 nm north, 5:36 pm PDT (00:36 UTC): no icing, overcast above 4,100 ft, remarks: during the descent ils runway 12. 339 nm along the route, 42 nm north of the line.
as filed, and in English
```
MSO UA /OV MSO/TM 0036/FL041/TP C25B/SK OVC041/IC NEG/RM DURD ILS RY 12
```
Report
a routine report filed through MSO
Where
over MSO
Time
00:36 UTC
Height
at 4,100 ft
Aircraft
C25B
Sky
overcast from 4,100 ft
Icing
none
Remarks
during the descent ils runway 12
B738 at 24,000 ft, 13 nm northeast, 4:13 pm PDT (23:13 UTC): remarks: snow top flight level at 24,000 ft zlc. 439 nm along the route, 13 nm northeast of the line.
as filed, and in English
```
BZN UA /OV BZN270030/TM 2313/FL240/TP B738/RM SN TOP FL 240 /ZLC
```
Report
a routine report filed through BZN
Where
30 nm west (270°) of BZN
Time
23:13 UTC
Height
at 24,000 ft
Aircraft
B738
Remarks
snow top flight level at 24,000 ft zlc
E75L descending, 13 nm northeast, 6:04 pm PDT (01:04 UTC): remarks: had the airport in sight at 400-500FT above ground. 469 nm along the route, 13 nm northeast of the line.
as filed, and in English
```
BZN UA /OV BZN/TM 0104/FLDURD/TP E75L/RM HAD THE AIRPORT IN SIGHT AT 400-500FT AGL
```
Report
a routine report filed through BZN
Where
over BZN
Time
01:04 UTC
Height
during the descent
Aircraft
E75L
Remarks
had the airport in sight at 400-500FT above ground
B737 descending, 13 nm northeast, 5:28 pm PDT (00:28 UTC): scattered clouds above 8,000 ft, fog, snow, remarks: broke out about 100FT above mins. 469 nm along the route, 13 nm northeast of the line.
as filed, and in English
```
BZN UA /OV BZN/TM 0028/FLDURD/TP B737/SK SCT080/WX 1/2SM SN FG/RM BROKE OUT ABOUT 100FT ABOVE MINS
```
Report
a routine report filed through BZN
Where
over BZN
Time
00:28 UTC
Height
during the descent
Aircraft
B737
Sky
scattered clouds from 8,000 ft
Weather
1/2SM, snow, fog
Remarks
broke out about 100FT above mins
B737 at 31,000 ft, 4 nm west, 5:13 pm PDT (00:13 UTC): light chop turbulence, remarks: ZME25. 1596 nm along the route, 4 nm west of the line.
as filed, and in English
```
PAH UA /OV CNG360015/TM 0013/FL310/TP B737/TB OCNL LGT CHOP/RM ZME25
```
Report
a routine report filed through PAH
Where
15 nm north (360°) of CNG
Time
00:13 UTC
Height
at 31,000 ft
Aircraft
B737
Turbulence
occasional light chop
Remarks
ZME25
B738 at 34,000 ft, 6 nm east, 4:41 pm PDT (23:41 UTC): light to moderate chop turbulence, remarks: zme. At the destination end, 6 nm east of the line.
as filed, and in English
```
CKV UA /OV CKV/TM 2341/FL340/TP B738/TB CONS LGT OCNL MOD CHOP/RM ZME
```
Report
a routine report filed through CKV
Where
over CKV
Time
23:41 UTC
Height
at 34,000 ft
Aircraft
B738
Turbulence
continuous light occasional moderate chop
Remarks
zme
B77W at 31,000 ft, 5 nm northeast, 4:27 pm PDT (23:27 UTC): light to moderate chop turbulence, remarks: zme. At the destination end, 5 nm northeast of the line.
as filed, and in English
```
BNA UA /OV BNA315030/TM 2327/FL310/TP B77W/TB CONS LGT OCNL MOD CHOP/RM ZME
```
Report
a routine report filed through BNA
Where
30 nm northwest (315°) of BNA
Time
23:27 UTC
Height
at 31,000 ft
Aircraft
B77W
Turbulence
continuous light occasional moderate chop
Remarks
zme
A319 at 32,000 ft, 3 nm northeast, 3:56 pm PDT (22:56 UTC): light to moderate chop turbulence, remarks: ZME62. At the destination end, 3 nm northeast of the line.
as filed, and in English
```
BNA UA /OV BNA315020/TM 2256/FL320/TP A319/TB CONS LGT OCNL MOD CHOP/RM ZME62
```
Report
a routine report filed through BNA
Where
20 nm northwest (315°) of BNA
Time
22:56 UTC
Height
at 32,000 ft
Aircraft
A319
Turbulence
continuous light occasional moderate chop
Remarks
ZME62

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 15 forecast points nearest it (SEA, YKM, GEG, LWS, DLN, BIL, RAP, ONL, GRI, OMA, MKC, COU, STL, CGI, BNA). 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	220° at 8 kt	−1 kt		121 kt	14 h 11 min	11:02 am CDT (16:02 UTC)
5,500 ft	180° at 4 kt	+3 kt	13 °C	117 kt	14 h 40 min	11:31 am CDT (16:31 UTC)
7,500 ft	220° at 3 kt	0	8 °C	120 kt	14 h 18 min	11:09 am CDT (16:09 UTC)
9,500 ft	240° at 7 kt	−3 kt	4 °C	123 kt	13 h 57 min	10:48 am CDT (15:48 UTC)
11,500 ft	240° at 11 kt	−6 kt	2 °C	126 kt	13 h 37 min	10:28 am CDT (15:28 UTC)
13,500 ft	240° at 13 kt	−8 kt	-2 °C	128 kt	13 h 24 min	10:15 am CDT (15:15 UTC)
15,500 ft	240° at 14 kt	−9 kt	-6 °C	129 kt	13 h 18 min	10:09 am CDT (15:09 UTC)
17,500 ft	250° at 16 kt	−11 kt	-10 °C	131 kt	13 h 06 min	9:57 am CDT (14:57 UTC)
18,000 ft FL180	250° at 16 kt	−11 kt	-11 °C	131 kt	13 h 06 min	9:57 am CDT (14:57 UTC)
24,000 ft FL240	250° at 23 kt	−17 kt	-21 °C	137 kt	12 h 32 min	9:23 am CDT (14:23 UTC)
30,000 ft FL300	250° at 29 kt	−22 kt	-35 °C	142 kt	12 h 05 min	8:56 am CDT (13:56 UTC)
34,000 ft FL340	250° at 38 kt	−31 kt	-41 °C	151 kt	11 h 22 min	8:13 am CDT (13:13 UTC)
39,000 ft FL390	260° at 44 kt	−39 kt	-47 °C	159 kt	10 h 48 min	7:39 am CDT (12:39 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; 43 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°
GEG	used from 150 nm out; 48 nm from the line		050/18 -2°	060/19 -8°	L/V -11°	160/11 -24°	190/17 -31°	200/19 -35°	220/14 -37°	250/11 -41°
LWS	used from 199 nm out; 21 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°
DLN	used from 349 nm out; 61 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°
BIL	used from 499 nm out; 71 nm from the line		080/24	130/14 -1°	180/33 0°	210/43 -10°	220/58 -21°	200/55 -36°	220/75 -44°	240/83 -48°
RAP	used from 698 nm out; 114 nm from the line		120/15 12°	180/22 11°	220/26 5°	230/35 -9°	240/40 -22°	240/50 -37°	240/51 -41°	240/47 -47°
ONL	used from 948 nm out; 80 nm from the line		200/20 17°	230/26 14°	240/21 7°	250/27 -9°	260/32 -19°	240/44 -34°	240/56 -41°	250/62 -51°
GRI	used from 1047 nm out; 42 nm from the line		210/31 19°	240/21 14°	240/17 6°	260/27 -7°	260/34 -18°	240/45 -32°	250/56 -40°	260/62 -51°
OMA	used from 1147 nm out; 38 nm from the line	190/34	230/34 19°	250/25 12°	250/18 6°	250/22 -7°	250/28 -19°	260/34 -32°	260/39 -41°	280/56 -51°
MKC	used from 1247 nm out; 57 nm from the line	200/28	220/30 16°	270/20 11°	280/22 7°	260/27 -6°	270/27 -18°	280/38 -32°	270/38 -40°	280/50 -52°
COU	used from 1347 nm out; 36 nm from the line	210/16	220/19 15°	240/33 10°	250/29 7°	280/21 -6°	280/19 -18°	300/34 -31°	300/40 -42°	300/60 -52°
STL	used from 1446 nm out; 36 nm from the line	210/13	260/16 17°	270/21 10°	280/24 5°	310/20 -7°	320/22 -18°	320/44 -33°	320/59 -43°	310/69 -51°
CGI	used from 1496 nm out; 48 nm from the line	250/10	290/12 17°	290/18 11°	300/22 5°	320/25 -8°	330/30 -18°	320/53 -33°	320/66 -42°	320/56 -50°
BNA	used from 1646 nm out; 45 nm from the line	280/13	340/34 16°	330/38 10°	330/44 5°	330/39 -8°	330/38 -19°	320/49 -34°	330/53 -40°	330/35 -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
BFI Seattle, WA	departure	VFR	from the northwest (310°) at 6 knots	10+ mi	none	21 ft	5:53 pm PDT (00:53 UTC)
MWH Moses Lake, WA	120 nm out, 6 nm northeast of the line, tower	VFR Sky: overcast at 10,000 feet	from the northeast (050°) at 13 knots, gusting to 18	10+ mi	10,000 ft	1,188 ft	00:52 UTC
LWS Lewiston, ID	229 nm out, 22 nm south of the line, tower	VFR Sky: overcast at 6,000 feet	from the west (270°) at 6 knots	10+ mi	6,000 ft	1,442 ft	00:56 UTC
BZN Bozeman, MT	469 nm out, 13 nm northeast of the line, tower	low IFR Sky: overcast at 300 feet Weather: light snow, mist	calm	1.5 mi	300 ft	4,473 ft	01:25 UTC
BYG Buffalo, WY	678 nm out, 3 nm west of the line	low IFR Sky: overcast at 200 feet Weather: rain, mist	from the north (360°) at 5 knots	2.5 mi	200 ft	4,970 ft	01:28 UTC
HSR Hot Springs, SD	828 nm out, 5 nm southeast of the line	no report just now				3,150 ft
IEN Pine Ridge, SD	878 nm out, 5 nm southwest of the line	no report just now				3,332 ft
LNK Lincoln, NE	1167 nm out, 7 nm southwest of the line, tower	VFR	from the south (170°) at 10 knots	10+ mi	none	1,218 ft	00:54 UTC
STJ St Joseph, MO	1267 nm out, 22 nm southwest of the line, tower	VFR	from the south (170°) at 8 knots	10+ mi	none	826 ft	00:53 UTC
COU Columbia, MO	1406 nm out, 8 nm southwest of the line, tower	VFR	from the south (180°) at 4 knots	10+ mi	none	889 ft	00:54 UTC
PAH Paducah, KY	1596 nm out, 11 nm south of the line, tower	VFR	calm	10+ mi	none	410 ft	00:00 UTC
BNA Nashville, TN	destination	VFR	variable at 4 knots	10+ mi	none	599 ft	7:53 pm CDT (00:53 UTC)

The highest airport on this list sits at 4,970 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BNA when you get there the forecast at the estimated arrival, 7:39 am CDT (12:39 UTC)

Wind light and variable, visibility more than 6 miles, clear skies VFR

The whole forecast for BNA

From Sun 7:00 pm CDT (00:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
From Mon 11:00 am CDT (16:00 UTC): wind from the west-southwest at 7 knots, visibility more than 6 miles, a few clouds at 20,000 feet
From Mon 8:00 pm CDT (01:00 UTC): wind from the south-southwest at 6 knots, visibility more than 6 miles, clear skies

The forecast for BFI, the departure

From Sun 5:00 pm PDT (00:00 UTC): wind from the north-northwest at 8 knots, gusting to 18, visibility more than 6 miles, a few clouds at 5,000 feet
From Sun 7:00 pm PDT (02:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind light and variable, 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 3 knots, visibility more than 6 miles, clear skies
From Mon 12:00 pm PDT (19:00 UTC): wind from the west-southwest at 3 knots, visibility more than 6 miles, clear skies
From Mon 2:00 pm PDT (21:00 UTC): wind from the west at 5 knots, visibility more than 6 miles, clear skies

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

6/7634 CENTRALIA, MO, Monday, October 12, 2026 UTC 10 nm from the route, 1396 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · today · ZKC
6/0708 Goodlettsville, TN, Saturday, August 1, 2026 through Sunday, August 1, 2027 UTC 10 nm from the route, at the destination end · security · until 1 August · ZME

Daylight

Sunset at BFI 6:27 pm PDT (01:27 UTC), at BNA 6:15 pm CDT (23:15 UTC) (civil twilight ends 6:40 pm CDT (23:40 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 upper Mississippi valley · 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: Boeing Fld/King County International, Nashville International.