Plan a flight · Mon 10:08 am EDT (14:08 UTC)

General Edward Lawrence Logan International to Boeing Fld/King County International BOS → BFI

2,162 nautical miles (2,487 statute miles) northwest on a straight line, true course 296°, about 311° magnetic at the departure end (variation 15W). At 120 knots that is 18 h 10 min at the quickest height in today's winds (4,500 ft, a 1-knot headwind), arriving about 1:18 am PDT (08:18 UTC), after sunset at the destination. Right now BOS is IFR, wind from the north-northeast (020°) at 3 knots; BFI is VFR, wind from the southeast (130°) 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: 1 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 C20C: thunderstorms (a convective SIGMET) up to 37,000 ft, moving from the southwest at 40 knots, until 11:55 am EDT (15:55 UTC). Near the route, 1235 nm along the route.
as issued
```
WSUS32 KKCI 121355
MKCC WST 121355
CONVECTIVE SIGMET 20C
VALID UNTIL 1555Z
SD ND
FROM 80W GFK-40WNW FAR-40W ABR-50ENE DPR-30S BIS-80W GFK
AREA TS MOV FROM 21040KT. TOPS TO FL370.
```
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 first 10 nm of the route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 24,000 ft to 40,000 ft. Over the first 120 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, mist). Over the route from 70 to 219 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 90 to 249 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 628 to 1803 nm out.
AIRMET ZULU 3C: moderate icing from 12,000 ft to 24,000 ft. Over the route from 638 to 817 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1136 to 1395 nm out.
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 1395 to 1952 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 1743 to 2102 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1763 to 1853 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 BOS.

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

A320 at 24,000 ft, 22 nm southwest, 9:42 am EDT (13:42 UTC): moderate turbulence. At the departure end, 22 nm southwest of the line.
as filed, and in English
```
ORH UA /OV ORH/TM 1342/FL240/TP A320/TB MOD 240-270 CONS LGT 280-ABV
```
Report
a routine report filed through ORH
Where
over ORH
Time
13:42 UTC
Height
at 24,000 ft
Aircraft
A320
Turbulence
moderate from 24,000 ft to 27,000 ft continuous light 280-ABV
B77W at 36,000 ft, 25 nm north, 8:21 am EDT (12:21 UTC): moderate clear-air turbulence. 239 nm along the route, 25 nm north of the line.
as filed, and in English
```
ART UA /OV ART030030/TM 1221/FL360/TP B77W/TB CONS MOD CAT
```
Report
a routine report filed through ART
Where
30 nm northeast (030°) of ART
Time
12:21 UTC
Height
at 36,000 ft
Aircraft
B77W
Turbulence
continuous moderate clear-air turbulence
B77W at 36,000 ft, 29 nm northeast, 8:18 am EDT (12:18 UTC): moderate clear-air turbulence. 239 nm along the route, 29 nm northeast of the line.
as filed, and in English
```
OGS UA /OV CURDS/TM 1218/FL360/TP B77W/TB CONS MOD CAT
```
Report
a routine report filed through OGS
Where
curds
Time
12:18 UTC
Height
at 36,000 ft
Aircraft
B77W
Turbulence
continuous moderate clear-air turbulence
A321 at 35,000 ft, 46 nm south, 7:16 am EDT (11:16 UTC): moderate chop turbulence above 35,000 ft. 249 nm along the route, 46 nm south of the line.
as filed, and in English
```
SYR UA /OV SYR320020/TM 1116/FL350/TP A321/TB OCNL MOD CHOP 350
```
Report
a routine report filed through SYR
Where
20 nm northwest (320°) of SYR
Time
11:16 UTC
Height
at 35,000 ft
Aircraft
A321
Turbulence
occasional moderate chop at 35,000 ft
H25B at 600 ft, 41 nm south, 9:46 am EDT (13:46 UTC): overcast above 600 ft. At the departure end, 41 nm south of the line.
as filed, and in English
```
EWB UA /OV EWB RY05 DEPT/TM 1346/FL006/TP H25B/SK OVC006
```
Report
a routine report filed through EWB
Where
ewb runway 05 dept
Time
13:46 UTC
Height
at 600 ft
Aircraft
H25B
Sky
overcast from 600 ft
A321 at 600 ft, 1 nm southeast, 9:43 am EDT (13:43 UTC): a broken layer above 600 ft. At the departure end, 1 nm southeast of the line.
as filed, and in English
```
BOS UA /OV BOS/TM 1343/FL006/TP A321/SK BKN006
```
Report
a routine report filed through BOS
Where
over BOS
Time
13:43 UTC
Height
at 600 ft
Aircraft
A321
Sky
a broken layer from 600 ft
C700 at 600 ft, 14 nm north, 9:40 am EDT (13:40 UTC): overcast above 600 ft. At the departure end, 14 nm north of the line.
as filed, and in English
```
BVY UA /OV BVY/TM 1340/FL006/TP C700/SK OVC006-TOPUNKN
```
Report
a routine report filed through BVY
Where
over BVY
Time
13:40 UTC
Height
at 600 ft
Aircraft
C700
Sky
overcast from 600 ft, tops unknown
C182 at 500 ft, 41 nm south, 9:26 am EDT (13:26 UTC): overcast above 500 ft, sand, dust whirls. At the departure end, 41 nm south of the line.
as filed, and in English
```
EWB UA /OV EWB RY05 APCH/TM 1326/FL005/TP C182/SK OVC005/WX SAW AIRPORT ON 1/2 NM FINAL
```
Report
a routine report filed through EWB
Where
ewb runway 05 approach
Time
13:26 UTC
Height
at 500 ft
Aircraft
C182
Sky
overcast from 500 ft
Weather
sand w, airport, on, 1/2, nautical miles, final
B738 at 600 ft, 1 nm southeast, 9:05 am EDT (13:05 UTC): a broken layer above 600 ft. At the departure end, 1 nm southeast of the line.
as filed, and in English
```
BOS UA /OV BOS/TM 1305/FL006/TP B738/SK BKN006
```
Report
a routine report filed through BOS
Where
over BOS
Time
13:05 UTC
Height
at 600 ft
Aircraft
B738
Sky
a broken layer from 600 ft
PC12 at 600 ft, 43 nm southwest, 9:00 am EDT (13:00 UTC): overcast above 600 ft, remarks: bases runway 34 departure end. At the departure end, 43 nm southwest of the line.
as filed, and in English
```
PVD UA /OV PVD/TM 1300/FL006/TP PC12/SK OVC006/RM BASES RY34 DEPARTURE END
```
Report
a routine report filed through PVD
Where
over PVD
Time
13:00 UTC
Height
at 600 ft
Aircraft
PC12
Sky
overcast from 600 ft
Remarks
bases runway 34 departure end
E75S at 600 ft, 1 nm southeast, 8:53 am EDT (12:53 UTC): a broken layer above 600 ft. At the departure end, 1 nm southeast of the line.
as filed, and in English
```
BOS UA /OV BOS/TM 1253/FL006/TP E75S/SK BKN006
```
Report
a routine report filed through BOS
Where
over BOS
Time
12:53 UTC
Height
at 600 ft
Aircraft
E75S
Sky
a broken layer from 600 ft
A321 at 500 ft, 1 nm southeast, 8:15 am EDT (12:15 UTC): a broken layer above 500 ft. At the departure end, 1 nm southeast of the line.
as filed, and in English
```
BOS UA /OV BOS/TM 1215/FL005/TP A321/SK BKN005
```
Report
a routine report filed through BOS
Where
over BOS
Time
12:15 UTC
Height
at 500 ft
Aircraft
A321
Sky
a broken layer from 500 ft
SR22 at 400 ft, 41 nm south, 7:56 am EDT (11:56 UTC): light turbulence, overcast above 40,000 ft. At the departure end, 41 nm south of the line.
as filed, and in English
```
EWB UA /OV EWB RY05 DEPT/TM 1156/FL004/TP SR22/SK OVC004/TB LT TBC
```
Report
a routine report filed through EWB
Where
ewb runway 05 dept
Time
11:56 UTC
Height
at 400 ft
Aircraft
SR22
Sky
overcast from 400 ft
Turbulence
lt tbc
E175 at 500 ft, 1 nm southeast, 7:50 am EDT (11:50 UTC): a broken layer above 500 ft. At the departure end, 1 nm southeast of the line.
as filed, and in English
```
BOS UA /OV BOS/TM 1150/FL005/TP E175/SK BKN005
```
Report
a routine report filed through BOS
Where
over BOS
Time
11:50 UTC
Height
at 500 ft
Aircraft
E175
Sky
a broken layer from 500 ft

16 more routine reports are on the map.

Winds aloft along the route, and the time en route the forecast for use 08:00–15:00 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 16 forecast points nearest it (BOS, ALB, SYR, BUF, TVC, GRB, DLH, INL, GFK, MOT, GGW, GTF, GPI, GEG, YKM, SEA). 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	350° at 3 kt	+1 kt	0 °C	119 kt	18 h 10 min	1:18 am PDT (08:18 UTC)
6,500 ft	310° at 4 kt	+4 kt	7 °C	116 kt	18 h 38 min	1:46 am PDT (08:46 UTC)
8,500 ft	280° at 7 kt	+7 kt	4 °C	113 kt	19 h 08 min	2:16 am PDT (09:16 UTC)
10,500 ft	270° at 12 kt	+12 kt	1 °C	108 kt	20 h 01 min	3:09 am PDT (10:09 UTC)
12,500 ft	270° at 16 kt	+16 kt	-1 °C	104 kt	20 h 47 min	3:55 am PDT (10:55 UTC)
14,500 ft	270° at 17 kt	+18 kt	-5 °C	102 kt	21 h 12 min	4:20 am PDT (11:20 UTC)
16,500 ft	270° at 19 kt	+20 kt	-9 °C	100 kt	21 h 37 min	4:45 am PDT (11:45 UTC)
18,000 ft FL180	280° at 20 kt	+21 kt	-12 °C	99 kt	21 h 50 min	4:58 am PDT (11:58 UTC)
24,000 ft FL240	280° at 23 kt	+24 kt	-24 °C	96 kt	22 h 31 min	5:39 am PDT (12:39 UTC)
30,000 ft FL300	280° at 23 kt	+24 kt	-38 °C	96 kt	22 h 31 min	5:39 am PDT (12:39 UTC)
34,000 ft FL340	270° at 36 kt	+37 kt	-43 °C	83 kt	26 h 03 min	9:11 am PDT (16:11 UTC)
39,000 ft FL390	270° at 46 kt	+48 kt	-48 °C	72 kt	30 h 02 min	1:10 pm PDT (20:10 UTC)

Based on data from the 12th at 06:00 UTC; valid on the 12th at 12:00 UTC for use 08:00 to 15:00 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
BOS	used from 0 nm out; 25 nm from the line	020/10	360/20 10°	340/19 7°	290/21 2°	270/35 -9°	260/42 -22°	250/55 -38°	240/75 -43°	250/72 -51°
ALB	used from 50 nm out; 57 nm from the line	340/22	340/19 9°	320/16 7°	330/16 2°	330/19 -11°	320/21 -23°	320/25 -39°	280/30 -44°	270/41 -51°
SYR	used from 199 nm out; 53 nm from the line	330/17	320/14 9°	350/18 8°	350/26 2°	340/25 -11°	360/34 -22°	350/43 -39°	330/50 -46°	350/50 -54°
BUF	used from 299 nm out; 105 nm from the line	300/11	330/15 11°	340/26 8°	330/28 2°	340/31 -10°	340/32 -21°	340/52 -37°	340/59 -46°	330/66 -53°
TVC	used from 498 nm out; 153 nm from the line	270/31	280/23 15°	260/22 8°	260/29 4°	280/29 -11°	280/42 -21°	270/42 -36°	270/54 -47°	290/67 -51°
GRB	used from 747 nm out; 143 nm from the line	250/32	250/22 17°	240/18 8°	280/21 6°	280/34 -11°	280/35 -21°	280/39 -37°	270/52 -45°	290/60 -49°
DLH	used from 797 nm out; 125 nm from the line	090/31	250/7 14°	250/26 11°	250/36 4°	280/36 -11°	290/35 -22°	300/39 -38°	280/41 -44°	280/66 -49°
INL	used from 996 nm out; 54 nm from the line	090/25	L/V 8°	250/20 6°	270/32 1°	270/44 -11°	280/48 -22°	280/56 -38°	270/50 -47°	280/83 -50°
GFK	used from 1046 nm out; 81 nm from the line	080/18	L/V 11°	260/22 7°	250/48 3°	260/51 -11°	250/44 -22°	260/34 -38°	260/53 -44°	270/66 -49°
MOT	used from 1245 nm out; 47 nm from the line		120/14 4°	190/25 5°	220/41 1°	240/43 -11°	230/39 -22°	220/44 -38°	240/62 -42°	250/73 -48°
GGW	used from 1444 nm out; 63 nm from the line		100/7 -1°	070/10 -3°	190/6 -4°	210/34 -10°	230/33 -24°	210/48 -37°	230/65 -40°	230/71 -46°
GTF	used from 1644 nm out; 79 nm from the line		L/V	L/V -7°	240/8 -8°	240/30 -14°	240/40 -28°	210/52 -38°	210/76 -38°	220/72 -43°
GPI	used from 1743 nm out; 67 nm from the line		090/8 -4°	140/7 -7°	090/10 -8°	110/10 -19°	210/25 -30°	200/24 -40°	210/31 -39°	210/35 -42°
GEG	used from 1893 nm out; 59 nm from the line		060/7 -2°	070/12 -6°	050/8 -8°	120/11 -21°	110/18 -33°	030/22 -37°	040/6 -38°	240/7 -41°
YKM	used from 2042 nm out; 78 nm from the line	360/6	360/11 -1°	030/20 -7°	040/21 -11°	020/55 -18°	010/84 -26°	010/79 -40°	010/45 -42°	350/23 -42°
SEA	used from 2092 nm out; 46 nm from the line	350/5	010/6 0°	010/9 -4°	010/27 -6°	010/51 -15°	360/58 -26°	360/60 -41°	350/55 -48°	340/30 -45°

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
BOS Boston, MA	departure	IFR Sky: a broken layer at 700 feet	from the north-northeast (020°) at 3 knots	10+ mi	700 ft	19 ft	9:54 am EDT (13:54 UTC)
ASH Nashua, NH	30 nm out, 13 nm north of the line, tower	VFR Sky: a few clouds at 1,000 feet	calm	10+ mi	none	200 ft	13:56 UTC
ART Watertown, NY	239 nm out, 3 nm southwest of the line	low IFR Sky: overcast at 400 feet Weather: mist	from the west-southwest (240°) at 4 knots	4 mi	400 ft	330 ft	13:56 UTC
DRM Drummond Island, MI	588 nm out, 3 nm southwest of the line	marginal VFR Sky: scattered clouds at 1,400 feet, a broken layer at 2,300 feet	calm	10+ mi	2,300 ft	668 ft	13:55 UTC
SAW Marquette, MI	737 nm out, 25 nm southwest of the line, tower	low IFR Sky: overcast at 200 feet Weather: mist	from the northeast (040°) at 11 knots	1.5 mi	200 ft	1,204 ft	13:47 UTC
FOZ Bigfork, MN	1006 nm out, 6 nm northwest of the line	IFR Sky: overcast at 700 feet	from the east (090°) at 7 knots	10+ mi	700 ft	1,351 ft	13:55 UTC
GFK Grand Forks, ND	1155 nm out, 9 nm south of the line, tower	low IFR Sky: overcast at 300 feet Weather: mist	from the north-northeast (020°) at 12 knots	1 mi	300 ft	845 ft	13:53 UTC
MOT Minot, ND	1315 nm out, 7 nm south of the line, tower	marginal VFR Sky: overcast at 1,000 feet Weather: light rain	from the north (360°) at 8 knots	7 mi	1,000 ft	1,715 ft	13:54 UTC
LTY Chester, MT	1703 nm out, 3 nm north of the line	no report just now				3,184 ft
GPI Kalispell, MT	1833 nm out, 2 nm west of the line, tower	VFR	from the north (360°) at 7 knots	10+ mi	none	2,976 ft	13:55 UTC
SFF Spokane, WA	1962 nm out, 24 nm south of the line, tower	VFR Sky: a few clouds at 6,000 feet, overcast at 8,500 feet	from the east-northeast (070°) at 6 knots	10+ mi	8,500 ft	1,956 ft	13:53 UTC
BFI Seattle, WA	destination	VFR	from the southeast (130°) at 3 knots	10+ mi	none	21 ft	6:53 am PDT (13:53 UTC)

The highest airport on this list sits at 3,184 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BFI when you get there the forecast at the estimated arrival, 1:18 am PDT (08:18 UTC)

Wind calm, visibility more than 6 miles, scattered clouds at 25,000 feet VFR

The whole forecast for BFI

From Mon 5:00 am PDT (12:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
From Mon 12:00 pm PDT (19:00 UTC): wind from the west-southwest at 4 knots, visibility more than 6 miles, clear skies
From Mon 2:00 pm PDT (21:00 UTC): wind from the west-northwest at 5 knots, visibility more than 6 miles, clear skies
From Mon 8:00 pm PDT (03:00 UTC): wind calm, visibility more than 6 miles, scattered clouds at 25,000 feet
From Tue 4:00 am PDT (11:00 UTC): wind from the south-southeast at 4 knots, visibility more than 6 miles, overcast at 10,000 feet

The forecast for BOS, the departure

From Mon 10:00 am EDT (14:00 UTC): wind from the north-northeast at 3 knots, visibility more than 6 miles, a broken layer at 700 feet
From Mon 12:00 pm EDT (16:00 UTC): wind from the north at 9 knots, visibility more than 6 miles, overcast at 1,500 feet
From Mon 1:00 pm EDT (17:00 UTC): wind from the north at 5 knots, visibility more than 6 miles, scattered clouds at 4,000 feet
At times between Mon 1:00 pm EDT (17:00 UTC) and 3:00 pm EDT (19:00 UTC): a broken layer at 3,000 feet
From Tue 12:00 am EDT (04:00 UTC): wind from the northeast at 10 knots, visibility more than 6 miles, overcast at 3,000 feet
From Tue 6:00 am EDT (10:00 UTC): wind from the east-northeast at 10 knots, visibility more than 6 miles, light rain, overcast at 800 feet

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

6/8802 Foxborough, MA, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 19 nm from the route, at the departure end · drones kept away from a public gathering · starts Saturday 17 October · ZBW
6/8771 NW NEGAUNEE, MI, Saturday, October 10, 2026 through Thursday, October 15, 2026 UTC 8 nm from the route, 757 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 15 October · ZMP
6/8665 9NM E HERMAN, MI, Friday, October 9, 2026 through Tuesday, October 13, 2026 UTC 11 nm from the route, 777 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 13 October · ZMP
6/4348 GRAND FORKS AFB, ND, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local on the route, 1165 nm along the route · security · until 1 November · ZMP
6/8927 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local on the route, 1833 nm along the route · a VIP movement · starts Wednesday 14 October · ZSE
6/8923 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local on the route, 1833 nm along the route · a VIP movement · starts Wednesday 14 October · ZLC

Daylight

Sunset at BOS 6:07 pm EDT (22:07 UTC), at BFI 6:25 pm PDT (01:25 UTC) (civil twilight ends 6:56 pm PDT (01:56 UTC)). At 120 knots the arrival at BFI is before sunrise there (7:24 am PDT (14:24 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 Northeast · loop National Weather Service

Radar now, the central Great Lakes · 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: General Edward Lawrence Logan International, Boeing Fld/King County International.