Plan a flight · Mon 10:09 am EDT (14:09 UTC)

Baltimore/Washington International Thurgood Marshall to Boeing Fld/King County International BWI → BFI

2,023 nautical miles (2,328 statute miles) northwest on a straight line, true course 300°, about 311° magnetic at the departure end (variation 11W). At 120 knots that is 17 h 45 min at the quickest height in today's winds (4,500 ft, a 6-knot headwind), arriving about 12:54 am PDT (07:54 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: 7 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). Over the route from 1066 to 1126 nm out.
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 TANGO 3W: moderate turbulence below 18,000 ft (due to mountain wave) up to 6,000 ft. Over the route from 40 to 100 nm out.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, mist). Over the route from 50 to 189 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 100 to 279 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 857 to 1654 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1246 to 1365 nm out.
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 1375 to 1834 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1485 to 1734 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 1654 to 1973 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 BWI.

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

E170 at 28,000 ft, 14 nm northeast, 9:10 am EDT (13:10 UTC): moderate chop turbulence. 458 nm along the route, 14 nm northeast of the line.
as filed, and in English
```
GRR UA /OV VIO/TM 1310/FL280/TP E170/TB OCNL MOD CHOP
```
Report
a routine report filed through GRR
Where
over VIO
Time
13:10 UTC
Height
at 28,000 ft
Aircraft
E170
Turbulence
occasional moderate chop
E170 at 15,000 ft, 35 nm north, 7:56 am EDT (11:56 UTC): moderate chop turbulence. 658 nm along the route, 35 nm north of the line.
as filed, and in English
```
Y50 UA /OV Y50330025/TM 1156/FL150/TP E170/TB MOD CHOP
```
Report
a routine report filed through Y50
Where
25 nm northwest (330°) of Y50
Time
11:56 UTC
Height
at 15,000 ft
Aircraft
E170
Turbulence
moderate chop
B38M at 2,600 ft, 3 nm west, 9:05 am EDT (13:05 UTC): a broken layer above 2,400 ft, remarks: TOP026. At the departure end, 3 nm west of the line.
as filed, and in English
```
BWI UA /OV BAL270003/TM 1305/FL026/TP B38M/SK BKN024/RM TOP026
```
Report
a routine report filed through BWI
Where
3 nm west (270°) of BAL
Time
13:05 UTC
Height
at 2,600 ft
Aircraft
B38M
Sky
a broken layer from 2,400 ft
Remarks
TOP026
B737 at 1,000 ft, 28 nm southwest, 8:40 am EDT (12:40 UTC): light chop turbulence, remarks: no bases reported on final approach runway 1. At the departure end, 28 nm southwest of the line.
as filed, and in English
```
DCA UA /OV DCA190003/TM 1240/FL010/TP B737/TB LGT CHOP/RM NO BASES REPORTED ON FINAL APPROACH RWY1
```
Report
a routine report filed through DCA
Where
3 nm south (190°) of DCA
Time
12:40 UTC
Height
at 1,000 ft
Aircraft
B737
Turbulence
light chop
Remarks
no bases reported on final approach runway 1
BE55 at 900 ft, 36 nm southeast, 8:34 am EDT (12:34 UTC): a broken layer above 1,100 ft; overcast above 1,900 ft, 15 °C, remarks: during the climb pilot reported base at at 900 ft. At the departure end, 36 nm southeast of the line.
as filed, and in English
```
ESN UA /OV ESN/TM 1234/FL009/TP BE55/SK BKN011 OVC019/WX 7/TA 15/WV 35009G16/RM DURC PILOT REPORTED BASE AT 009
```
Report
a routine report filed through ESN
Where
over ESN
Time
12:34 UTC
Height
at 900 ft
Aircraft
BE55
Sky
BKN011 OVC019
Weather
7
Temperature
15 °C
Wind
35009G16
Remarks
during the climb pilot reported base at at 900 ft
B39M at 1,200 ft, 0 nm south, 7:10 am EDT (11:10 UTC): remarks: base 1200FT tops 2000FT. At the departure end, 0 nm south of the line.
as filed, and in English
```
BWI UA /OV BWI/TM 1110/FL012/TP B39M/RM BASE 1200FT TOPS 2000FT
```
Report
a routine report filed through BWI
Where
over BWI
Time
11:10 UTC
Height
at 1,200 ft
Aircraft
B39M
Remarks
base 1200FT tops 2000FT
E75S at 2,400 ft, 25 nm south, 9:47 am EDT (13:47 UTC): overcast above 2,400 ft. At the departure end, 25 nm south of the line.
as filed, and in English
```
DCA UA /OV DCA19004/TM 1347/FL024/TP E75S/SK OVC024
```
Report
a routine report filed through DCA
Where
DCA19004
Time
13:47 UTC
Height
at 2,400 ft
Aircraft
E75S
Sky
overcast from 2,400 ft
B783 at 5,000 ft, 5 nm south, 8:30 am EDT (12:30 UTC): a routine report with nothing remarked on. At the departure end, 5 nm south of the line.
as filed, and in English
```
BWI UA /OV BAL280010/TM 1230/FL50/TP B783/SK BASE 028 TOP 040
```
Report
a routine report filed through BWI
Where
10 nm west (280°) of BAL
Time
12:30 UTC
Height
at 5,000 ft
Aircraft
B783
Sky
base 2,800 ft top 4,000 ft
E170 at 1,000 ft, 25 nm south, 7:32 am EDT (11:32 UTC): a broken layer above 1,200 ft. At the departure end, 25 nm south of the line.
as filed, and in English
```
DCA UA /OV DCA/TM 1132/FL010/TP E170/SK BKN012
```
Report
a routine report filed through DCA
Where
over DCA
Time
11:32 UTC
Height
at 1,000 ft
Aircraft
E170
Sky
a broken layer from 1,200 ft
PC12 at 2,500 ft, 34 nm northeast, 8:32 am EDT (12:32 UTC): a routine report with nothing remarked on. At the departure end, 34 nm northeast of the line.
as filed, and in English
```
MDT UA /OV THV/TM 1232/FL025/TP PC12/SK BASES025
```
Report
a routine report filed through MDT
Where
over THV
Time
12:32 UTC
Height
at 2,500 ft
Aircraft
PC12
Sky
BASES025
SF50 at 2,500 ft, 34 nm northeast, 8:11 am EDT (12:11 UTC): a routine report with nothing remarked on. At the departure end, 34 nm northeast of the line.
as filed, and in English
```
MDT UA /OV THV/TM 1211/FL025/TP SF50/SK BASES025
```
Report
a routine report filed through MDT
Where
over THV
Time
12:11 UTC
Height
at 2,500 ft
Aircraft
SF50
Sky
BASES025
C170 at 1,500 ft, 6 nm south, 9:55 am EDT (13:55 UTC): overcast above 2,300 ft. At the departure end, 6 nm south of the line.
as filed, and in English
```
FDK UA /OV FDK/TM 1355/FL015/TP C170/SK OVC023
```
Report
a routine report filed through FDK
Where
over FDK
Time
13:55 UTC
Height
at 1,500 ft
Aircraft
C170
Sky
overcast from 2,300 ft
SF50 at 3,000 ft, 6 nm south, 8:15 am EDT (12:15 UTC): a broken layer above 2,000 ft. At the departure end, 6 nm south of the line.
as filed, and in English
```
FDK UA /OV FDK/TM 1215/FL030/TP SF50/SK BKN020
```
Report
a routine report filed through FDK
Where
over FDK
Time
12:15 UTC
Height
at 3,000 ft
Aircraft
SF50
Sky
a broken layer from 2,000 ft
UAL1428 at 32,000 ft, 16 nm southwest, 7:36 am EDT (11:36 UTC): no turbulence, -39 °C, wind 360° at 59 knots. At the departure end, 16 nm southwest of the line.
as filed, and in English
```
ARP UAL1428 3923N 07750W 1136 F320 MS39 360/059KT TB NONE SK CLEAR IC NONE
```
Report
a routine report filed through ARP

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 18 forecast points nearest it (PSB, AGC, CLE, FWA, MKG, GRB, LSE, MSP, AXN, ABR, DIK, MLS, BIL, 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	280° at 6 kt	+6 kt	2 °C	114 kt	17 h 45 min	12:54 am PDT (07:54 UTC)
6,500 ft	280° at 7 kt	+7 kt	9 °C	113 kt	17 h 54 min	1:03 am PDT (08:03 UTC)
8,500 ft	260° at 9 kt	+8 kt	6 °C	112 kt	18 h 04 min	1:13 am PDT (08:13 UTC)
10,500 ft	260° at 11 kt	+10 kt	2 °C	110 kt	18 h 23 min	1:32 am PDT (08:32 UTC)
12,500 ft	270° at 13 kt	+13 kt	-1 °C	107 kt	18 h 54 min	2:03 am PDT (09:03 UTC)
14,500 ft	270° at 14 kt	+14 kt	-5 °C	106 kt	19 h 05 min	2:14 am PDT (09:14 UTC)
16,500 ft	270° at 16 kt	+16 kt	-9 °C	104 kt	19 h 27 min	2:36 am PDT (09:36 UTC)
18,000 ft FL180	270° at 17 kt	+17 kt	-12 °C	103 kt	19 h 38 min	2:47 am PDT (09:47 UTC)
24,000 ft FL240	270° at 21 kt	+21 kt	-24 °C	99 kt	20 h 26 min	3:35 am PDT (10:35 UTC)
30,000 ft FL300	270° at 24 kt	+24 kt	-36 °C	96 kt	21 h 04 min	4:13 am PDT (11:13 UTC)
34,000 ft FL340	270° at 34 kt	+35 kt	-41 °C	85 kt	23 h 48 min	6:57 am PDT (13:57 UTC)
39,000 ft FL390	270° at 43 kt	+44 kt	-47 °C	76 kt	26 h 37 min	9:46 am PDT (16:46 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
PSB	used from 0 nm out; 100 nm from the line		020/21 12°	360/28 7°	360/29 1°	350/33 -10°	350/42 -22°	350/49 -37°	340/63 -43°	350/39 -52°
AGC	used from 100 nm out; 42 nm from the line	340/11	350/12 11°	360/25 7°	340/30 2°	340/41 -8°	340/44 -21°	350/59 -36°	340/68 -42°	340/50 -51°
CLE	used from 199 nm out; 49 nm from the line	310/7	350/20 14°	340/16 9°	320/21 2°	320/32 -8°	330/34 -20°	330/45 -36°	320/60 -45°	320/64 -51°
FWA	used from 349 nm out; 84 nm from the line	270/20	300/16 15°	290/14 10°	280/17 3°	290/25 -7°	280/30 -19°	280/34 -35°	290/48 -44°	300/64 -52°
MKG	used from 399 nm out; 73 nm from the line	260/28	260/18 15°	250/16 9°	260/22 4°	280/31 -9°	270/35 -21°	270/44 -35°	270/42 -45°	290/61 -51°
GRB	used from 548 nm out; 69 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°
LSE	used from 648 nm out; 44 nm from the line	250/25	240/21 17°	240/28 11°	250/28 5°	280/24 -10°	280/31 -21°	260/35 -37°	270/45 -43°	280/59 -47°
MSP	used from 748 nm out; 41 nm from the line	250/12	250/17 17°	240/26 12°	250/26 5°	280/26 -9°	280/32 -22°	270/37 -38°	280/47 -41°	280/55 -48°
AXN	used from 847 nm out; 60 nm from the line	110/6	260/10 16°	240/17 12°	250/20 5°	260/29 -10°	260/35 -22°	260/29 -38°	270/48 -41°	270/61 -48°
ABR	used from 947 nm out; 64 nm from the line	080/12	210/12 17°	220/22 12°	230/26 5°	220/28 -10°	230/41 -21°	250/36 -36°	260/47 -39°	260/63 -47°
DIK	used from 1146 nm out; 60 nm from the line		190/12 5°	230/29 7°	220/33 1°	220/43 -11°	210/47 -23°	220/53 -33°	240/56 -40°	250/72 -47°
MLS	used from 1296 nm out; 40 nm from the line		290/17 -1°	250/18 0°	230/25 0°	220/31 -11°	220/32 -24°	220/50 -32°	220/60 -38°	230/71 -46°
BIL	used from 1445 nm out; 82 nm from the line		300/14	270/19 -2°	260/26 -2°	220/28 -13°	210/51 -25°	220/56 -33°	220/61 -39°	220/72 -45°
GTF	used from 1495 nm out; 61 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 1645 nm out; 57 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 1744 nm out; 61 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 1894 nm out; 70 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 1944 nm out; 56 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	Elevation
BWI Baltimore, MD	departure	no report just now	143 ft
HGR Hagerstown, MD	60 nm out, 4 nm northeast of the line, tower	no report just now	703 ft
JXN Jackson, MI	399 nm out, 4 nm north of the line, tower	no report just now	1,000 ft
BTL Battle Creek, MI	429 nm out, 9 nm southwest of the line, tower	no report just now	951 ft
CMY Sparta, WI	698 nm out, 8 nm south of the line, tower	no report just now	839 ft
FCM Minneapolis, MN	817 nm out, 5 nm north of the line, tower	no report just now	906 ft
ASY Ashley, ND	1076 nm out, 5 nm north of the line	no report just now	2,034 ft
DIK Dickinson, ND	1226 nm out, 18 nm north of the line	no report just now	2,592 ft
GTF Great Falls, MT	1585 nm out, 8 nm northeast of the line, tower	no report just now	3,680 ft
THM Thompson Falls, MT	1734 nm out, 5 nm northwest of the line	no report just now	2,467 ft
GEG Spokane, WA	1834 nm out, 4 nm northeast of the line, tower	no report just now	2,385 ft
BFI Seattle, WA	destination	no report just now	21 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 BFI when you get there the forecast at the estimated arrival, 12:54 am PDT (07:54 UTC)

BFI has no terminal forecast; use the nearest airport that does.

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

4/9383 WASHINGTON, DC., USA 12 nm from the route, at the departure end · security · ZDC
6/8800 Baltimore, MD, Saturday, October 17, 2026 through Sunday, October 18, 2026 UTC 6 nm from the route, at the departure end · drones kept away from a public gathering · starts Saturday 17 October · ZDC
6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 16 nm from the route, at the departure end · a VIP movement · today · ZDC
6/8587 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local on the route, 199 nm along the route · a VIP movement · today · ZOB
6/8888 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 22 nm from the route, 219 nm along the route · security · today · ZOB
6/8829 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 6 nm from the route, 219 nm along the route · a VIP movement · today · ZOB
6/8992 Monroe, MI, Thursday, October 15, 2026 Local 1 nm from the route, 349 nm along the route · a VIP movement · starts Thursday 15 October · ZOB
6/8927 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local 5 nm from the route, 1684 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 15 nm from the route, 1704 nm along the route · a VIP movement · starts Wednesday 14 October · ZLC

Daylight

Sunset at BWI 6:32 pm EDT (22:32 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: Baltimore/Washington International Thurgood Marshall, Boeing Fld/King County International.