General Edward Lawrence Logan International to Seattle-Tacoma International BOS → SEA
2,163 nautical miles (2,489 statute miles) northwest on a straight line, true course 296°, about 311° magnetic at the departure end (variation 15W). At 120 knots that is 17 h 27 min at the quickest height in today's winds (4,500 ft, a 4-knot tailwind), arriving about 4:39 pm PDT (23:39 UTC). Right now BOS is marginal VFR, wind from the north (360°) at 10 knots; SEA is VFR, wind from the east-southeast (110°) at 6 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: 4,924 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 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the first 249 nm of the route.
- AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the first 249 nm of the route.
- AIRMET TANGO 2W: moderate turbulence below 18,000 ft up to 10,000 ft. Over the first 90 nm of the route.
- AIRMET ZULU 1C: moderate icing up to 22,000 ft. Over the route from 10 to 229 nm out.
- AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 70 to 219 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 927 to 1814 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1425 to 2023 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 1684 to 1874 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1774 to 1904 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 199 nm of the route.
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
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 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 | 080° at 4 kt | −4 kt | 0 °C | 124 kt | 17 h 27 min | 4:39 pm PDT (23:39 UTC) |
| 6,500 ft | 060° at 1 kt | −1 kt | 6 °C | 121 kt | 17 h 53 min | 5:05 pm PDT (00:05 UTC) |
| 8,500 ft | 260° at 2 kt | +2 kt | 4 °C | 118 kt | 18 h 20 min | 5:32 pm PDT (00:32 UTC) |
| 10,500 ft | 250° at 6 kt | +5 kt | 1 °C | 115 kt | 18 h 49 min | 6:01 pm PDT (01:01 UTC) |
| 12,500 ft | 250° at 11 kt | +9 kt | -2 °C | 111 kt | 19 h 29 min | 6:41 pm PDT (01:41 UTC) |
| 14,500 ft | 250° at 15 kt | +14 kt | -6 °C | 106 kt | 20 h 24 min | 7:36 pm PDT (02:36 UTC) |
| 16,500 ft | 260° at 19 kt | +18 kt | -10 °C | 102 kt | 21 h 12 min | 8:24 pm PDT (03:24 UTC) |
| 18,000 ft FL180 | 260° at 22 kt | +21 kt | -12 °C | 99 kt | 21 h 51 min | 9:03 pm PDT (04:03 UTC) |
| 24,000 ft FL240 | 260° at 27 kt | +25 kt | -23 °C | 95 kt | 22 h 46 min | 9:58 pm PDT (04:58 UTC) |
| 30,000 ft FL300 | 260° at 32 kt | +30 kt | -37 °C | 90 kt | 24 h 02 min | 11:14 pm PDT (06:14 UTC) |
| 34,000 ft FL340 | 260° at 37 kt | +35 kt | -44 °C | 85 kt | 25 h 27 min | 12:39 am PDT (07:39 UTC) |
| 39,000 ft FL390 | 260° at 53 kt | +50 kt | -49 °C | 70 kt | 30 h 54 min | 6:06 am PDT (13:06 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| BOS | used from 0 nm out; 25 nm from the line | 110/20 | 200/26 12° | 280/24 8° | 260/29 3° | 250/47 -10° | 230/59 -19° | 230/74 -33° | 240/95 -41° | 240/96 -53° |
| ALB | used from 50 nm out; 57 nm from the line | 120/9 | 270/8 10° | L/V 5° | 260/9 1° | 260/34 -10° | 250/42 -22° | 240/57 -35° | 240/70 -42° | 240/65 -50° |
| SYR | used from 199 nm out; 52 nm from the line | 280/13 | 350/18 10° | 340/10 6° | 300/15 1° | 280/17 -12° | 270/16 -23° | 280/25 -38° | 250/40 -42° | 240/53 -50° |
| BUF | used from 299 nm out; 104 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° |
| TVC | used from 498 nm out; 152 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° |
| GRB | used from 748 nm out; 142 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° |
| DLH | used from 797 nm out; 124 nm from the line | 080/28 | 240/21 15° | 250/26 9° | 250/32 3° | 260/42 -11° | 270/40 -21° | 260/43 -36° | 260/46 -46° | 260/65 -54° |
| INL | used from 997 nm out; 57 nm from the line | 080/23 | L/V 9° | 260/22 5° | 260/27 0° | 260/43 -11° | 270/47 -21° | 270/57 -36° | 270/54 -47° | 270/69 -56° |
| GFK | used from 1047 nm out; 80 nm from the line | 070/18 | 100/10 9° | 250/11 6° | 250/27 1° | 250/34 -10° | 260/43 -21° | 260/39 -36° | 260/36 -46° | 260/59 -53° |
| MOT | used from 1246 nm out; 46 nm from the line | 120/14 5° | 200/20 4° | 230/33 1° | 250/39 -11° | 250/50 -21° | 240/61 -37° | 250/56 -45° | 260/68 -51° | |
| GGW | used from 1445 nm out; 61 nm from the line | 110/23 0° | 130/20 -2° | 170/24 -3° | 230/44 -11° | 220/51 -21° | 210/52 -39° | 220/64 -44° | 240/85 -48° | |
| GTF | used from 1645 nm out; 76 nm from the line | 070/11 | 080/15 -7° | 110/19 -9° | 190/25 -14° | 200/34 -23° | 200/54 -39° | 220/66 -40° | 220/77 -44° | |
| GPI | used from 1744 nm out; 66 nm from the line | 070/19 -5° | 100/16 -7° | 080/10 -8° | 130/8 -19° | 170/37 -28° | 200/50 -40° | 210/43 -40° | 220/41 -42° | |
| GEG | used from 1894 nm out; 56 nm from the line | 080/16 -2° | 050/17 -7° | 080/9 -10° | 190/33 -21° | 180/31 -32° | L/V -35° | L/V -37° | 270/8 -40° | |
| YKM | used from 2043 nm out; 73 nm from the line | 070/10 | 040/15 -1° | 020/27 -8° | 030/25 -13° | 020/48 -20° | 010/83 -27° | 010/77 -37° | 010/49 -40° | 350/14 -41° |
| SEA | used from 2093 nm out; 45 nm from the line | 050/7 | 050/11 1° | 050/12 -5° | 030/31 -7° | 010/61 -15° | 010/69 -26° | 360/73 -40° | 360/62 -47° | 330/21 -43° |
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 | marginal VFR Sky: scattered clouds at 500 feet, overcast at 1,200 feet Weather: light rain, mist | from the north (360°) at 10 knots | 3 mi | 1,200 ft | 19 ft | 2:06 am EDT (06:06 UTC) |
| ASH Nashua, NH | 30 nm out, 13 nm north of the line, tower | low IFR Sky: overcast at 400 feet Weather: rain, mist | from the north (350°) at 4 knots | 4 mi | 400 ft | 200 ft | 05:56 UTC |
| ART Watertown, NY | 239 nm out, 2 nm southwest of the line | marginal VFR Sky: a broken layer at 2,400 feet, overcast at 3,000 feet | calm | 10+ mi | 2,400 ft | 330 ft | 06:03 UTC |
| DRM Drummond Island, MI | 588 nm out, 2 nm west of the line | IFR Sky: sky obscured at 700 feet Weather: mist | calm | 1.25 mi | 700 ft | 668 ft | 05:55 UTC |
| SAW Marquette, MI | 738 nm out, 23 nm southwest of the line, tower | VFR | from the east-northeast (060°) at 3 knots | 10+ mi | none | 1,204 ft | 05:58 UTC |
| EVM Eveleth, MN | 957 nm out, 7 nm southwest of the line | VFR Sky: scattered clouds at 1,200 feet | from the northeast (050°) at 6 knots | 10+ mi | none | 1,376 ft | 05:55 UTC |
| GFK Grand Forks, ND | 1156 nm out, 7 nm southeast of the line, tower | IFR Sky: overcast at 600 feet | from the north (010°) at 11 knots | 10+ mi | 600 ft | 845 ft | 05:53 UTC |
| MOT Minot, ND | 1316 nm out, 4 nm south of the line, tower | marginal VFR Sky: overcast at 1,000 feet | from the north-northeast (020°) at 9 knots | 10+ mi | 1,000 ft | 1,715 ft | 05:54 UTC |
| LTY Chester, MT | 1704 nm out, 7 nm north of the line | no report just now | 3,184 ft | ||||
| GPI Kalispell, MT | 1834 nm out, 4 nm north of the line, tower | VFR Sky: overcast at 7,000 feet | from the north (010°) at 11 knots | 10+ mi | 7,000 ft | 2,976 ft | 05:55 UTC |
| SFF Spokane, WA | 1964 nm out, 20 nm south of the line, tower | VFR | from the north (010°) at 4 knots | 10+ mi | none | 1,956 ft | 05:53 UTC |
| SEA Seattle, WA | destination | VFR | from the east-southeast (110°) at 6 knots | 10+ mi | none | 432 ft | 10:53 pm PDT (05:53 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 SEA when you get there the forecast at the estimated arrival, 4:39 pm PDT (23:39 UTC)
Wind from the west at 6 knots, visibility more than 6 miles, clear skies VFR
The whole forecast for SEA
- From Sun 11:00 pm PDT (06:00 UTC): wind from the east-northeast at 6 knots, visibility more than 6 miles, clear skies
- From Mon 3:00 am PDT (10:00 UTC): wind from the southeast at 4 knots, 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 4 knots, visibility more than 6 miles, clear skies
- From Mon 11:00 am PDT (18:00 UTC): wind from the west at 6 knots, visibility more than 6 miles, clear skies
- From Mon 8:00 pm PDT (03:00 UTC): wind from the south at 4 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
The forecast for BOS, the departure
- From Mon 2:00 am EDT (06:00 UTC): wind from the northeast at 12 knots, visibility 3 miles, light rain showers, mist, overcast at 300 feet
- From Mon 7:00 am EDT (11:00 UTC): wind from the north-northeast at 11 knots, visibility 5 miles, mist, a broken layer at 800 feet
- From Mon 11:00 am EDT (15:00 UTC): wind from the north at 8 knots, visibility more than 6 miles, scattered clouds at 15,000 feet
- From Mon 3:00 pm EDT (19:00 UTC): wind from the northwest at 7 knots, visibility more than 6 miles, scattered clouds at 15,000 feet
- From Mon 11:00 pm EDT (03:00 UTC): wind from the northeast at 10 knots, visibility more than 6 miles, scattered clouds at 4,500 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 6 nm from the route, 758 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 9 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, 1166 nm along the route · security · until 1 November · ZMP
Daylight
Sunset at BOS 6:07 pm EDT (22:07 UTC), at SEA 6:27 pm PDT (01:27 UTC) (civil twilight ends 6:58 pm PDT (01:58 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: General Edward Lawrence Logan International, Seattle-Tacoma International.