Boeing Fld/King County International to General Edward Lawrence Logan International BFI → BOS
2,162 nautical miles (2,487 statute miles) east on a straight line, true course 079°, about 064° magnetic at the departure end (variation 15E). At 120 knots that is 12 h 48 min at the quickest height in today's winds (39,000 ft, a 49-knot tailwind), arriving about 8:24 pm EDT (00:24 UTC), after sunset at the destination. 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
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 30 to 418 nm out.
- AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 219 to 737 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 359 to 1524 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 379 to 388 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 747 to 887 nm out.
- AIRMET ZULU 3C: moderate icing from 13,000 ft to 24,000 ft. Over the route from 1265 to 1395 nm out.
- AIRMET TANGO 2W: 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 1574 to 1574 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 last 249 nm of the route.
- AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 24,000 ft to 33,000 ft. Over the last 249 nm of the route.
- AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, mist). Over the route from 1942 to 2092 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
- A321 at 35,000 ft, 46 nm south, 4:16 am PDT (11:16 UTC): moderate chop turbulence above 35,000 ft. 1913 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
- B738 at 28,000 ft, 46 nm north, 3:32 am PDT (10:32 UTC): moderate turbulence, remarks: produced by skypath. At the destination end, 46 nm north of the line.
as filed, and in English
1P1 UA /OV CON339022 /TM 1032 /FL280 /TP B738 /TB MOD /RM PRODUCED BY SKYPATH
- Report
- a routine report filed through 1P1
- Where
- 22 nm north (339°) of CON
- Time
- 10:32 UTC
- Height
- at 28,000 ft
- Aircraft
- B738
- Turbulence
- moderate
- Remarks
- produced by skypath
- A321 at 9,500 ft, 7 nm northeast, 2:05 am PDT (09:05 UTC): moderate turbulence, remarks: moderate turbulence during the descent jfund arrival from from 9,500 ft to 7,000 ft, smooth below. At the destination end, 7 nm northeast of the line.
as filed, and in English
BOS UA /OV BOS350010/TM 0905/FL095/TP A321/TB MOD/RM MOD TB DURD JFUND ARR FROM 095-070, SMOOTH BELOW
- Report
- a routine report filed through BOS
- Where
- 10 nm north (350°) of BOS
- Time
- 09:05 UTC
- Height
- at 9,500 ft
- Aircraft
- A321
- Turbulence
- moderate
- Remarks
- moderate turbulence during the descent jfund arrival from from 9,500 ft to 7,000 ft, smooth below
- BCS3 at 10,000 ft, 1 nm southeast, 3:15 am PDT (10:15 UTC): moderate turbulence from 7,000 ft to 9,000 ft, remarks: during the climb ssoxs aid. At the destination end, 1 nm southeast of the line.
as filed, and in English
BOS UA /OV BOS/TM 1015/FL100/TP BCS3/TB MOD 070-090/RM DURC SSOXS AID
- Report
- a routine report filed through BOS
- Where
- over BOS
- Time
- 10:15 UTC
- Height
- at 10,000 ft
- Aircraft
- BCS3
- Turbulence
- moderate from 7,000 ft to 9,000 ft
- Remarks
- during the climb ssoxs aid
- B38M at 39,000 ft, 16 nm north, 4:13 am PDT (11:13 UTC): light chop turbulence above 39,000 ft. 1942 nm along the route, 16 nm north of the line.
as filed, and in English
ART UA /OV ART080030/TM 1113/FL390/TP B38M/TB OCNL LGT CHOP 390
- Report
- a routine report filed through ART
- Where
- 30 nm east (080°) of ART
- Time
- 11:13 UTC
- Height
- at 39,000 ft
- Aircraft
- B38M
- Turbulence
- occasional light chop at 39,000 ft
- B38M at 39,000 ft, 34 nm northeast, 4:14 am PDT (11:14 UTC): light clear-air turbulence. 1962 nm along the route, 34 nm northeast of the line.
as filed, and in English
PTD UA /OV PTD180030/TM 1114/FL390/TP B38M/TB CONS LGT CAT
- Report
- a routine report filed through PTD
- Where
- 30 nm south (180°) of PTD
- Time
- 11:14 UTC
- Height
- at 39,000 ft
- Aircraft
- B38M
- Turbulence
- continuous light clear-air turbulence
- B738 at 38,000 ft, 41 nm southwest, 3:58 am PDT (10:58 UTC): light clear-air turbulence above 38,000 ft. 1982 nm along the route, 41 nm southwest of the line.
as filed, and in English
RME UA /OV UCA/TM 1058/FL380/TP B738/TB CONS LGT CAT 380
- Report
- a routine report filed through RME
- Where
- over UCA
- Time
- 10:58 UTC
- Height
- at 38,000 ft
- Aircraft
- B738
- Turbulence
- continuous light clear-air turbulence at 38,000 ft
- B737 at 6,700 ft, 32 nm southwest, 4:02 am PDT (11:02 UTC): a broken layer up to 6,700 ft; clear from 6,700 ft to 60,000 ft, remarks: during the climb. 2042 nm along the route, 32 nm southwest of the line.
as filed, and in English
ALB UA /OV ALB/TM 1102/FL067/TP B737/SK BKN-TOP067/SKC/RM DURC
- Report
- a routine report filed through ALB
- Where
- over ALB
- Time
- 11:02 UTC
- Height
- at 6,700 ft
- Aircraft
- B737
- Sky
- BKN-TOP067 C
- Remarks
- during the climb
- MULT at 36,000 ft, 10 nm southwest, 3:34 am PDT (10:34 UTC): light turbulence from 23,000 ft to 32,000 ft. 2052 nm along the route, 10 nm southwest of the line.
as filed, and in English
ALB UA /OV CAM/TM 1034/FL360/TP MULT/TB LGT 320-230
- Report
- a routine report filed through ALB
- Where
- over CAM
- Time
- 10:34 UTC
- Height
- at 36,000 ft
- Aircraft
- MULT
- Turbulence
- light from 32,000 ft to 23,000 ft
- B737 at 5,000 ft, 49 nm southwest, 4:02 am PDT (11:02 UTC): no turbulence, scattered clouds from 3,500 ft to 4,000 ft. At the destination end, 49 nm southwest of the line.
as filed, and in English
BDL UA /OV KBDL020007/TM 1102/FL050/TP B737/SK SCT 035 TOPS 040/TB SMOOTH
- Report
- a routine report filed through BDL
- Where
- 7 nm north (020°) of KBDL
- Time
- 11:02 UTC
- Height
- at 5,000 ft
- Aircraft
- B737
- Sky
- scattered clouds from 3,500 ft, tops 4,000 ft
- Turbulence
- smooth
- H25B at 500 ft, 4 nm northwest, 4:06 am PDT (11:06 UTC): overcast above 500 ft. At the destination end, 4 nm northwest of the line.
as filed, and in English
BED UA /OV BED/TM 1106/FL005/TP H25B/SK OVC005
- Report
- a routine report filed through BED
- Where
- over BED
- Time
- 11:06 UTC
- Height
- at 500 ft
- Aircraft
- H25B
- Sky
- overcast from 500 ft
- MULT at 2,000 ft, 17 nm north, 3:18 am PDT (10:18 UTC): light turbulence from 1,500 ft to 2,000 ft, remarks: during the climb out of KBOS. At the destination end, 17 nm north of the line.
as filed, and in English
LWM UA /OV LWM/TM 1018/FL020/TP MULT/TB CONS LGT 020-015/RM DURC OUT OF KBOS
- Report
- a routine report filed through LWM
- Where
- over LWM
- Time
- 10:18 UTC
- Height
- at 2,000 ft
- Aircraft
- MULT
- Turbulence
- continuous light from 2,000 ft to 1,500 ft
- Remarks
- during the climb out of KBOS
- C402 at 500 ft, 41 nm south, 4:14 am PDT (11:14 UTC): overcast above 500 ft. At the destination end, 41 nm south of the line.
as filed, and in English
EWB UA /OV EWB RY 05 DEPT/TM 1114/FL005/TP C402/SK OVC005
- Report
- a routine report filed through EWB
- Where
- ewb runway 05 dept
- Time
- 11:14 UTC
- Height
- at 500 ft
- Aircraft
- C402
- Sky
- overcast from 500 ft
- B738 at 600 ft, 1 nm southeast, 4:07 am PDT (11:07 UTC): a broken layer above 600 ft. At the destination end, 1 nm southeast of the line.
as filed, and in English
BOS UA /OV BOS/TM 1107/FL006/TP B738/SK BKN006
- Report
- a routine report filed through BOS
- Where
- over BOS
- Time
- 11:07 UTC
- Height
- at 600 ft
- Aircraft
- B738
- Sky
- a broken layer from 600 ft
3 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 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 16 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, GGW, MOT, GFK, INL, DLH, GRB, TVC, BUF, SYR, ALB, BOS). 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 | 320° at 6 kt | −5 kt | 125 kt | 17 h 18 min | 12:54 am EDT (04:54 UTC) | |
| 5,500 ft | 320° at 4 kt | −3 kt | 0 °C | 123 kt | 17 h 35 min | 1:11 am EDT (05:11 UTC) |
| 7,500 ft | 290° at 5 kt | −6 kt | 5 °C | 126 kt | 17 h 10 min | 12:46 am EDT (04:46 UTC) |
| 9,500 ft | 270° at 8 kt | −9 kt | 2 °C | 129 kt | 16 h 46 min | 12:22 am EDT (04:22 UTC) |
| 11,500 ft | 270° at 14 kt | −14 kt | 0 °C | 134 kt | 16 h 08 min | 11:44 pm EDT (03:44 UTC) |
| 13,500 ft | 270° at 16 kt | −17 kt | -4 °C | 137 kt | 15 h 47 min | 11:23 pm EDT (03:23 UTC) |
| 15,500 ft | 270° at 18 kt | −19 kt | -8 °C | 139 kt | 15 h 33 min | 11:09 pm EDT (03:09 UTC) |
| 17,500 ft | 270° at 20 kt | −21 kt | -12 °C | 141 kt | 15 h 20 min | 10:56 pm EDT (02:56 UTC) |
| 18,000 ft FL180 | 270° at 20 kt | −21 kt | -12 °C | 141 kt | 15 h 20 min | 10:56 pm EDT (02:56 UTC) |
| 24,000 ft FL240 | 270° at 23 kt | −25 kt | -24 °C | 145 kt | 14 h 55 min | 10:31 pm EDT (02:31 UTC) |
| 30,000 ft FL300 | 270° at 24 kt | −25 kt | -38 °C | 145 kt | 14 h 55 min | 10:31 pm EDT (02:31 UTC) |
| 34,000 ft FL340 | 260° at 37 kt | −38 kt | -43 °C | 158 kt | 13 h 41 min | 9:17 pm EDT (01:17 UTC) |
| 39,000 ft FL390 | 270° at 46 kt | −49 kt | -48 °C | 169 kt | 12 h 48 min | 8:24 pm EDT (00:24 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SEA | used from 0 nm out; 27 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° |
| YKM | used from 50 nm out; 71 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° |
| GEG | used from 100 nm out; 72 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° | |
| GPI | used from 249 nm out; 53 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° | |
| GTF | used from 398 nm out; 60 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° | |
| GGW | used from 548 nm out; 62 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° | |
| MOT | used from 747 nm out; 73 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° | |
| GFK | used from 946 nm out; 40 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° |
| INL | used from 1096 nm out; 62 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° |
| DLH | used from 1195 nm out; 40 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° |
| GRB | used from 1345 nm out; 149 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° |
| TVC | used from 1395 nm out; 139 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° |
| BUF | used from 1693 nm out; 157 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° |
| SYR | used from 1843 nm out; 88 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° |
| ALB | used from 1992 nm out; 39 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° |
| BOS | used from 2092 nm out; 45 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° |
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 | no report just now | 21 ft | ||||
| SFF Spokane, WA | 199 nm out, 24 nm south of the line, tower | no report just now | 1,956 ft | ||||
| GPI Kalispell, MT | 329 nm out, 2 nm west of the line, tower | no report just now | 2,976 ft | ||||
| LTY Chester, MT | 458 nm out, 3 nm north of the line | no report just now | 3,184 ft | ||||
| MOT Minot, ND | 847 nm out, 7 nm south of the line, tower | no report just now | 1,715 ft | ||||
| GFK Grand Forks, ND | 1006 nm out, 9 nm south of the line, tower | no report just now | 845 ft | ||||
| FOZ Bigfork, MN | 1155 nm out, 6 nm northwest of the line | no report just now | 1,351 ft | ||||
| SAW Marquette, MI | 1424 nm out, 25 nm southwest of the line, tower | no report just now | 1,204 ft | ||||
| DRM Drummond Island, MI | 1574 nm out, 3 nm southwest of the line | no report just now | 668 ft | ||||
| ART Watertown, NY | 1922 nm out, 3 nm southwest of the line | no report just now | 330 ft | ||||
| ASH Nashua, NH | 2132 nm out, 13 nm north of the line, tower | no report just now | 200 ft | ||||
| BOS Boston, MA | destination | no report just now | 19 ft |
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 BOS when you get there the forecast at the estimated arrival, 8:24 pm EDT (00:24 UTC)
BOS has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/8927 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local on the route, 319 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, 319 nm along the route · a VIP movement · starts Wednesday 14 October · ZLC
- 6/4348 GRAND FORKS AFB, ND, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local on the route, 996 nm along the route · security · until 1 November · ZMP
- 6/8665 9NM E HERMAN, MI, Friday, October 9, 2026 through Tuesday, October 13, 2026 UTC 11 nm from the route, 1385 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 13 October · ZMP
- 6/8771 NW NEGAUNEE, MI, Saturday, October 10, 2026 through Thursday, October 15, 2026 UTC 8 nm from the route, 1405 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 15 October · ZMP
- 6/8802 Foxborough, MA, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 19 nm from the route, at the destination end · drones kept away from a public gathering · starts Saturday 17 October · ZBW
Daylight
Sunset at BFI 6:25 pm PDT (01:25 UTC), at BOS 6:07 pm EDT (22:07 UTC) (civil twilight ends 6:35 pm EDT (22:35 UTC)). At 120 knots the arrival at BOS is after sunset there (6:07 pm EDT (22:07 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: Boeing Fld/King County International, General Edward Lawrence Logan International.