Plan a flight · Mon 1:58 am EDT (05:58 UTC)

Southern Cross Airport to Boeing Fld/King County International C01 → BFI

2,076 nautical miles (2,389 statute miles) northwest on a straight line, true course 299°, about 311° magnetic at the departure end (variation 12W). At 120 knots that is 17 h 09 min at the quickest height in today's winds (4,500 ft, a 1-knot tailwind), arriving about 4:07 pm PDT (23:07 UTC). Right now BFI is VFR, wind calm. 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 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 519 nm of the route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the first 180 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 100 to 230 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 669 to 789 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 978 to 1807 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1397 to 1397 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1527 to 1827 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 1607 to 1807 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 190 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 C01.

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

urgent B39M at 35,000 ft, 44 nm northeast, 11:15 pm EDT (03:15 UTC): remarks: no inj/dmg zob. 289 nm along the route, 44 nm northeast of the line.
as filed, and in English
```
DKK UUA /OV DKK280040/TM 0315/FL350/TP B39M/TB MTN WVE ACTN +/-5KTS/RM NO INJ/DMG ZOB
```
Report
an urgent report filed through DKK
Where
40 nm west (280°) of DKK
Time
03:15 UTC
Height
at 35,000 ft
Aircraft
B39M
Turbulence
mountain wve actn a 5-knot loss of airspeed
Remarks
no inj/dmg zob
A319 at 23,000 ft, 29 nm northeast, 11:21 pm EDT (03:21 UTC): moderate turbulence. At the departure end, 29 nm northeast of the line.
as filed, and in English
```
MJX UA /OV CYN345010/TM 0321/FL230/TP A319/TB MOD
```
Report
a routine report filed through MJX
Where
10 nm north (345°) of CYN
Time
03:21 UTC
Height
at 23,000 ft
Aircraft
A319
Turbulence
moderate
E145 at 600 ft, 11 nm south, 11:20 pm EDT (03:20 UTC): overcast above 600 ft. 90 nm along the route, 11 nm south of the line.
as filed, and in English
```
MDT UA /OV MDT/TM 0320/FL006/TP E145/SK OVC 006
```
Report
a routine report filed through MDT
Where
over MDT
Time
03:20 UTC
Height
at 600 ft
Aircraft
E145
Sky
overcast from 600 ft
A333 descending, 30 nm south, 1:44 am EDT (05:44 UTC): a routine report with nothing remarked on. 409 nm along the route, 30 nm south of the line.
as filed, and in English
```
DTW UA /OV DTW/TM 0544/FLDURD/TP A333/SK TOPS 025
```
Report
a routine report filed through DTW
Where
over DTW
Time
05:44 UTC
Height
during the descent
Aircraft
A333
Sky
tops 2,500 ft
B739 descending, 30 nm south, 12:54 am EDT (04:54 UTC): a routine report with nothing remarked on. 409 nm along the route, 30 nm south of the line.
as filed, and in English
```
DTW UA /OV DTW/TM 0454/FLDURD/TP B739/SK BASES 011
```
Report
a routine report filed through DTW
Where
over DTW
Time
04:54 UTC
Height
during the descent
Aircraft
B739
Sky
bases 1,100 ft
A320 descending, 30 nm south, 11:27 pm EDT (03:27 UTC): overcast above 1,400 ft. 409 nm along the route, 30 nm south of the line.
as filed, and in English
```
DTW UA /OV DTW/TM 0327/FLDURD/TP A320/SK 014 OVC
```
Report
a routine report filed through DTW
Where
over DTW
Time
03:27 UTC
Height
during the descent
Aircraft
A320
Sky
at 1,400 ft overcast
CL30 at 4,200 ft, 47 nm south, 11:16 pm EDT (03:16 UTC): no icing, overcast above 4,200 ft, remarks: during the descent ils runway 12. 1747 nm along the route, 47 nm south of the line.
as filed, and in English
```
MSO UA /OV MSO/TM 0316/FL042/TP CL30/SK OVC042/WX 2 1/2SM/IC NEG/RM DURD ILS RY 12
```
Report
a routine report filed through MSO
Where
over MSO
Time
03:16 UTC
Height
at 4,200 ft
Aircraft
CL30
Sky
overcast from 4,200 ft
Weather
2, 1/2SM
Icing
none
Remarks
during the descent ils runway 12

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 18 forecast points nearest it (ACY, AVP, PSB, CLE, MKG, GRB, LSE, MSP, AXN, ABR, DIK, MLS, 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	170° at 2 kt	−1 kt	3 °C	121 kt	17 h 09 min	4:07 pm PDT (23:07 UTC)
6,500 ft	230° at 2 kt	+1 kt	9 °C	119 kt	17 h 27 min	4:25 pm PDT (23:25 UTC)
8,500 ft	240° at 4 kt	+3 kt	6 °C	117 kt	17 h 45 min	4:43 pm PDT (23:43 UTC)
10,500 ft	240° at 8 kt	+5 kt	2 °C	115 kt	18 h 03 min	5:01 pm PDT (00:01 UTC)
12,500 ft	240° at 11 kt	+8 kt	-1 °C	112 kt	18 h 32 min	5:30 pm PDT (00:30 UTC)
14,500 ft	250° at 14 kt	+11 kt	-5 °C	109 kt	19 h 03 min	6:01 pm PDT (01:01 UTC)
16,500 ft	260° at 17 kt	+15 kt	-9 °C	105 kt	19 h 46 min	6:44 pm PDT (01:44 UTC)
18,000 ft FL180	260° at 19 kt	+18 kt	-12 °C	102 kt	20 h 21 min	7:19 pm PDT (02:19 UTC)
24,000 ft FL240	260° at 22 kt	+20 kt	-23 °C	100 kt	20 h 46 min	7:44 pm PDT (02:44 UTC)
30,000 ft FL300	260° at 26 kt	+24 kt	-37 °C	96 kt	21 h 38 min	8:36 pm PDT (03:36 UTC)
34,000 ft FL340	260° at 35 kt	+34 kt	-42 °C	86 kt	24 h 08 min	11:06 pm PDT (06:06 UTC)
39,000 ft FL390	260° at 45 kt	+44 kt	-48 °C	76 kt	27 h 19 min	2:17 am PDT (09:17 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
ACY	used from 0 nm out; 48 nm from the line	220/19	220/18 14°	210/36 9°	210/35 5°	220/36 -8°	240/49 -21°	220/90 -31°	230/103 -40°	230/81 -50°
AVP	used from 50 nm out; 73 nm from the line	150/5	350/13 12°	270/20 8°	260/17 4°	260/25 -11°	240/31 -22°	240/54 -35°	230/61 -41°	240/55 -49°
PSB	used from 100 nm out; 34 nm from the line		360/13 13°	330/14 7°	300/11 3°	290/12 -11°	240/23 -23°	270/25 -36°	250/34 -40°	250/45 -48°
CLE	used from 250 nm out; 70 nm from the line	340/7	010/16 13°	350/18 8°	350/20 3°	340/31 -10°	340/46 -21°	340/54 -37°	330/62 -44°	340/65 -49°
MKG	used from 449 nm out; 77 nm from the line	260/22	290/16 15°	300/11 10°	290/5 3°	300/26 -9°	300/32 -20°	320/48 -36°	320/61 -45°	310/74 -53°
GRB	used from 599 nm out; 33 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°
LSE	used from 699 nm out; 74 nm from the line	230/40	240/24 17°	240/13 10°	250/13 6°	280/22 -9°	250/28 -21°	250/41 -34°	260/42 -44°	270/62 -53°
MSP	used from 799 nm out; 50 nm from the line	230/26	240/30 17°	240/24 12°	250/22 5°	250/35 -10°	260/36 -21°	250/41 -36°	250/49 -45°	260/58 -52°
AXN	used from 898 nm out; 46 nm from the line	100/14	250/21 14°	240/24 12°	240/31 5°	260/36 -10°	260/40 -21°	250/42 -36°	260/48 -45°	260/53 -50°
ABR	used from 1048 nm out; 53 nm from the line	070/14	250/10 17°	270/16 11°	260/28 5°	260/36 -10°	260/41 -22°	270/33 -37°	260/42 -42°	260/50 -48°
DIK	used from 1198 nm out; 59 nm from the line		150/24 7°	200/38 6°	220/53 0°	230/51 -9°	230/49 -21°	240/37 -37°	240/47 -44°	250/65 -48°
MLS	used from 1347 nm out; 58 nm from the line		150/23 2°	190/29 4°	210/44 2°	220/32 -10°	210/36 -21°	200/48 -37°	230/63 -40°	240/71 -47°
GGW	used from 1447 nm out; 60 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 1547 nm out; 62 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 1697 nm out; 48 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 1797 nm out; 62 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 1946 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 1996 nm out; 56 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
C01 Williamstown, NJ	departure	no report just now				145 ft
UNV State College, PA	150 nm out, 2 nm northeast of the line, tower	low IFR Sky: overcast at 300 feet Weather: mist	from the north-northeast (020°) at 6 knots	1.5 mi	300 ft	1,231 ft	05:36 UTC
DET Detroit, MI	399 nm out, 13 nm south of the line, tower	marginal VFR Sky: overcast at 1,100 feet	from the west (280°) at 6 knots	10+ mi	1,100 ft	624 ft	05:53 UTC
FNT Flint, MI	439 nm out, 5 nm north of the line, tower	VFR Sky: a few clouds at 700 feet	from the southwest (220°) at 4 knots	10+ mi	none	782 ft	05:53 UTC
ATW Appleton, WI	659 nm out, 3 nm west of the line, tower	VFR	from the south (180°) at 7 knots	10+ mi	none	918 ft	05:35 UTC
STC St Cloud, MN	908 nm out, 2 nm northwest of the line, tower	VFR	from the north (360°) at 4 knots	10+ mi	none	1,030 ft	05:53 UTC
BIS Bismarck, ND	1198 nm out, 6 nm north of the line, tower	IFR Sky: overcast at 700 feet Weather: light rain	variable at 5 knots	10+ mi	700 ft	1,661 ft	05:52 UTC
GDV Glendive, MT	1367 nm out, 2 nm east of the line	low IFR Sky: overcast at 400 feet Weather: heavy rain, mist	from the northeast (050°) at 13 knots	6 mi	400 ft	2,458 ft	05:56 UTC
GTF Great Falls, MT	1637 nm out, 8 nm southeast of the line, tower	IFR Sky: overcast at 800 feet Weather: light snow, mist	from the north (360°) at 10 knots	3 mi	800 ft	3,680 ft	05:53 UTC
COE Coeur D'Alene, ID	1857 nm out, 5 nm northeast of the line	VFR Sky: overcast at 8,000 feet	from the north-northeast (030°) at 9 knots	10+ mi	8,000 ft	2,320 ft	04:56 UTC
SFF Spokane, WA	1876 nm out, 2 nm east of the line, tower	VFR	from the north (010°) at 4 knots	10+ mi	none	1,956 ft	05:53 UTC
BFI Seattle, WA	destination	VFR	calm	10+ mi	none	21 ft	10:53 pm PDT (05:53 UTC)

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 BFI when you get there the forecast at the estimated arrival, 4:07 pm PDT (23:07 UTC)

Wind from the west at 5 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for BFI

From Sun 11:00 pm PDT (06:00 UTC): wind calm, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind calm, 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
From Mon 7:00 pm PDT (02:00 UTC): wind calm, visibility more than 6 miles, clear skies

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

6/8829 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 6 nm from the route, 269 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, 269 nm along the route · a VIP movement · today · ZOB
6/6656 ANOKA, MN, Monday, October 5, 2026 through Monday, October 19, 2026 Local 11 nm from the route, 878 nm along the route · security · until 19 October · ZMP

Daylight

Sunset at C01 6:25 pm EDT (22:25 UTC), at BFI 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

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: Southern Cross Airport, Boeing Fld/King County International.