Boeing Fld/King County International to Southern Cross Airport BFI → C01
2,076 nautical miles (2,389 statute miles) east on a straight line, true course 085°, about 070° magnetic at the departure end (variation 15E). At 120 knots that is 12 h 21 min at the quickest height in today's winds (39,000 ft, a 48-knot tailwind), arriving about 10:35 am EDT (14:35 UTC). 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 6E: thunderstorms (a convective SIGMET) up to 30,000 ft, moving from the southwest at 20 knots, until 8:55 pm PDT (03:55 UTC). Over the last 90 nm of the route.
as issued
WSUS31 KKCI 120155 MKCE WST 120155 CONVECTIVE SIGMET 6E VALID UNTIL 0355Z NY NJ PA DE MD AND DE NJ NY MD CSTL WTRS FROM 20WNW SAX-70S HTO-50ESE SBY-30WSW HAR-20WNW SAX AREA EMBD TS MOV FROM 22020KT. TOPS TO FL300.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the first 160 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 110 to 489 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 240 to 539 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 838 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 289 to 858 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 988 to 1078 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 419 nm of the route.
- AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the route from 1817 to 2046 nm out.
- AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1847 to 1976 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
Not fetched just now.
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 19 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, GGW, MLS, DIK, ABR, AXN, MSP, LSE, GRB, MKG, CLE, AGC, PSB, AVP, ACY). 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 | 230° at 5 kt | −2 kt | 122 kt | 17 h 01 min | 3:15 pm EDT (19:15 UTC) | |
| 5,500 ft | light and variable | +1 kt | 3 °C | 119 kt | 17 h 27 min | 3:41 pm EDT (19:41 UTC) |
| 7,500 ft | 230° at 3 kt | −1 kt | 7 °C | 121 kt | 17 h 09 min | 3:23 pm EDT (19:23 UTC) |
| 9,500 ft | 230° at 6 kt | −3 kt | 4 °C | 123 kt | 16 h 53 min | 3:07 pm EDT (19:07 UTC) |
| 11,500 ft | 240° at 9 kt | −6 kt | 1 °C | 126 kt | 16 h 29 min | 2:43 pm EDT (18:43 UTC) |
| 13,500 ft | 240° at 12 kt | −9 kt | -3 °C | 129 kt | 16 h 06 min | 2:20 pm EDT (18:20 UTC) |
| 15,500 ft | 240° at 16 kt | −12 kt | -7 °C | 132 kt | 15 h 44 min | 1:58 pm EDT (17:58 UTC) |
| 17,500 ft | 240° at 19 kt | −15 kt | -11 °C | 135 kt | 15 h 23 min | 1:37 pm EDT (17:37 UTC) |
| 18,000 ft FL180 | 240° at 20 kt | −15 kt | -12 °C | 135 kt | 15 h 23 min | 1:37 pm EDT (17:37 UTC) |
| 24,000 ft FL240 | 250° at 25 kt | −21 kt | -23 °C | 141 kt | 14 h 43 min | 12:57 pm EDT (16:57 UTC) |
| 30,000 ft FL300 | 250° at 38 kt | −31 kt | -36 °C | 151 kt | 13 h 45 min | 11:59 am EDT (15:59 UTC) |
| 34,000 ft FL340 | 250° at 45 kt | −37 kt | -43 °C | 157 kt | 13 h 13 min | 11:27 am EDT (15:27 UTC) |
| 39,000 ft FL390 | 260° at 53 kt | −48 kt | -49 °C | 168 kt | 12 h 21 min | 10:35 am EDT (14:35 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; 26 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; 63 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 100 nm out; 68 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° | |
| GPI | used from 250 nm out; 63 nm from the line | 060/19 -3° | 110/11 -8° | 130/6 -8° | 200/40 -19° | 190/58 -28° | 200/101 -39° | 220/73 -43° | 230/41 -43° | |
| GTF | used from 399 nm out; 20 nm from the line | 070/21 | 080/18 -6° | 120/5 -5° | 180/30 -14° | 200/53 -24° | 210/80 -38° | 220/83 -44° | 230/68 -46° | |
| GGW | used from 549 nm out; 78 nm from the line | 090/18 0° | 140/12 -2° | 150/13 -3° | 200/35 -12° | 230/56 -22° | 240/75 -37° | 240/81 -46° | 240/78 -49° | |
| MLS | used from 649 nm out; 49 nm from the line | 120/22 5° | 170/18 4° | 200/33 1° | 230/49 -10° | 230/58 -21° | 220/54 -37° | 230/64 -44° | 250/74 -49° | |
| DIK | used from 749 nm out; 23 nm from the line | 110/15 6° | 200/17 5° | 230/31 1° | 240/47 -10° | 240/52 -20° | 230/52 -36° | 240/57 -45° | 250/67 -51° | |
| ABR | used from 898 nm out; 84 nm from the line | 030/24 | 220/5 16° | 230/18 12° | 230/32 5° | 240/38 -10° | 250/37 -20° | 240/40 -35° | 240/56 -44° | 250/72 -52° |
| AXN | used from 1048 nm out; 34 nm from the line | L/V | 220/23 17° | 230/24 12° | 240/25 5° | 260/32 -11° | 260/40 -21° | 270/50 -35° | 270/57 -45° | 270/81 -55° |
| MSP | used from 1148 nm out; 47 nm from the line | 200/28 | 240/30 19° | 240/24 12° | 240/17 5° | 270/24 -10° | 270/33 -20° | 280/48 -35° | 290/55 -45° | 280/84 -54° |
| LSE | used from 1298 nm out; 61 nm from the line | 220/33 | 250/29 17° | 250/15 9° | 260/12 6° | 280/21 -9° | 280/33 -20° | 300/43 -36° | 310/56 -45° | 300/79 -53° |
| GRB | used from 1347 nm out; 56 nm from the line | 240/24 | 260/18 16° | 270/20 11° | 290/14 4° | 280/24 -9° | 300/34 -21° | 310/51 -38° | 310/54 -48° | 300/71 -51° |
| MKG | used from 1497 nm out; 27 nm from the line | 250/5 | 320/10 15° | 310/19 9° | 320/21 3° | 310/23 -10° | 330/37 -22° | 330/51 -38° | 320/44 -47° | 300/60 -49° |
| CLE | used from 1647 nm out; 91 nm from the line | 340/5 | 320/13 14° | 300/12 8° | 310/10 2° | 310/14 -10° | 340/14 -23° | 320/27 -35° | 260/28 -40° | 250/36 -48° |
| AGC | used from 1797 nm out; 75 nm from the line | 140/12 | 350/10 12° | L/V 9° | L/V 3° | 200/11 -11° | 220/21 -22° | 220/47 -33° | 230/51 -39° | 230/45 -48° |
| PSB | used from 1847 nm out; 46 nm from the line | 260/13 13° | 220/12 8° | 220/11 4° | 230/27 -11° | 210/31 -21° | 220/73 -32° | 220/75 -40° | 230/66 -50° | |
| AVP | used from 1996 nm out; 76 nm from the line | 110/36 | 190/34 13° | 230/11 8° | 230/16 4° | 230/26 -8° | 220/40 -19° | 230/73 -33° | 230/98 -41° | 230/87 -51° |
| ACY | used from 2046 nm out; 38 nm from the line | 230/15 | 230/22 15° | 230/31 11° | 230/27 6° | 230/40 -7° | 230/51 -17° | 230/71 -31° | 230/81 -41° | 230/86 -53° |
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 | 200 nm out, 2 nm east of the line, tower | no report just now | 1,956 ft | ||||
| COE Coeur D'Alene, ID | 220 nm out, 5 nm northeast of the line | no report just now | 2,320 ft | ||||
| GTF Great Falls, MT | 439 nm out, 8 nm southeast of the line, tower | no report just now | 3,680 ft | ||||
| GDV Glendive, MT | 709 nm out, 2 nm east of the line | no report just now | 2,458 ft | ||||
| BIS Bismarck, ND | 878 nm out, 6 nm north of the line, tower | no report just now | 1,661 ft | ||||
| STC St Cloud, MN | 1168 nm out, 2 nm northwest of the line, tower | no report just now | 1,030 ft | ||||
| ATW Appleton, WI | 1417 nm out, 3 nm west of the line, tower | no report just now | 918 ft | ||||
| FNT Flint, MI | 1637 nm out, 5 nm north of the line, tower | no report just now | 782 ft | ||||
| DET Detroit, MI | 1677 nm out, 13 nm south of the line, tower | no report just now | 624 ft | ||||
| UNV State College, PA | 1926 nm out, 2 nm northeast of the line, tower | no report just now | 1,231 ft | ||||
| C01 Williamstown, NJ | destination | no report just now | 145 ft |
The highest airport on this list sits at 3,680 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At C01 when you get there the forecast at the estimated arrival, 10:35 am EDT (14:35 UTC)
C01 has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/6656 ANOKA, MN, Monday, October 5, 2026 through Monday, October 19, 2026 Local 11 nm from the route, 1198 nm along the route · security · until 19 October · ZMP
- 6/8829 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 6 nm from the route, 1807 nm along the route · a VIP movement · today · ZOB
- 6/8587 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 6 nm from the route, 1807 nm along the route · a VIP movement · today · ZOB
Daylight
Sunset at BFI 6:27 pm PDT (01:27 UTC), at C01 6:25 pm EDT (22:25 UTC) (civil twilight ends 6:52 pm EDT (22:52 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, Southern Cross Airport.