Baltimore/Washington International Thurgood Marshall to Seattle-Tacoma International BWI → SEA
2,024 nautical miles (2,329 statute miles) northwest on a straight line, true course 299°, about 310° 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 10:10 pm PDT (05:10 UTC), after sunset at the destination. Right now BWI is marginal VFR, wind from the west-northwest (300°) at 6 knots; SEA is VFR, wind from the southeast (130°) 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: 1,441 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 C17C: thunderstorms (a convective SIGMET) up to 36,000 ft, moving from the southwest at 40 knots, until 8:55 am EDT (12:55 UTC). Over the route from 1097 to 1157 nm out.
as issued
WSUS32 KKCI 121055 MKCC WST 121055 CONVECTIVE SIGMET 17C VALID UNTIL 1255Z SD ND FROM 20NW BIS-60E BIS-20WNW PIR-20SW DPR-20NW BIS AREA TS MOV FROM 22040KT. TOPS TO FL360.
- 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 419 nm of the route.
- AIRMET TANGO 3W: moderate turbulence below 18,000 ft (due to mountain wave) up to 6,000 ft. Over the route from 40 to 120 nm out.
- AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, mist). Over the route from 60 to 179 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 897 to 1655 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1276 to 1366 nm out.
- AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 1376 to 1834 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1476 to 1795 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 1645 to 1994 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
- E75S at 15,000 ft, 30 nm northeast, 6:35 am EDT (10:35 UTC): moderate turbulence, remarks: dca arrival from 12,000 ft to 15,000 ft during the descent. At the departure end, 30 nm northeast of the line.
as filed, and in English
BWI UA /OV BAL060030/TM 1035/FL150/TP E75S/TB MOD/RM DCA ARRIVAL 120-150 DURD
- Report
- a routine report filed through BWI
- Where
- 30 nm northeast (060°) of BAL
- Time
- 10:35 UTC
- Height
- at 15,000 ft
- Aircraft
- E75S
- Turbulence
- moderate
- Remarks
- dca arrival from 12,000 ft to 15,000 ft during the descent
- B737 at 700 ft, 0 nm south, 5:33 am EDT (09:33 UTC): remarks: light rain. At the departure end, 0 nm south of the line.
as filed, and in English
BWI UA /OV BWI/TM 0933/FL007/TP B737/RM LIGHT RAIN
- Report
- a routine report filed through BWI
- Where
- over BWI
- Time
- 09:33 UTC
- Height
- at 700 ft
- Aircraft
- B737
- Remarks
- light rain
- B39M descending, 30 nm south, 6:42 am EDT (10:42 UTC): overcast above 4,000 ft. At the departure end, 30 nm south of the line.
as filed, and in English
IAD UA /OV RWY 1R/TM 1042/FLDURD/TP B39M/SK OVC 040/WX 10 SM
- Report
- a routine report filed through IAD
- Where
- runway 1R
- Time
- 10:42 UTC
- Height
- during the descent
- Aircraft
- B39M
- Sky
- overcast from 4,000 ft
- Weather
- 10, miles
- CL30 at 2,600 ft, 4 nm west, 6:41 am EDT (10:41 UTC): overcast above 2,600 ft, remarks: during the climb runway 24 KLBE. 140 nm along the route, 4 nm west of the line.
as filed, and in English
LBE UA /OV KLBE/TM 1041/FL026/TP CL30/SK OVC026-TOPUNKN/RM DURC RWY 24 KLBE
- Report
- a routine report filed through LBE
- Where
- over KLBE
- Time
- 10:41 UTC
- Height
- at 2,600 ft
- Aircraft
- CL30
- Sky
- overcast from 2,600 ft, tops unknown
- Remarks
- during the climb runway 24 KLBE
- NMRS at 31,000 ft, 3 nm north, 6:42 am EDT (10:42 UTC): light to moderate turbulence from 29,000 ft to 33,000 ft, remarks: zob. 150 nm along the route, 3 nm north of the line.
as filed, and in English
PIT UA /OV PIT-JST/TM 1042/FL310/TP NMRS/TB CONS LGT OCNL MOD 290-330/RM ZOB
- Report
- a routine report filed through PIT
- Where
- between PIT and JST
- Time
- 10:42 UTC
- Height
- at 31,000 ft
- Aircraft
- NMRS
- Turbulence
- continuous light occasional moderate from 29,000 ft to 33,000 ft
- Remarks
- zob
- P68 at 1,500 ft, 10 nm south, 7:18 am EDT (11:18 UTC): remarks: bases 1500 ils runway 28. 169 nm along the route, 10 nm south of the line.
as filed, and in English
AGC UA /OV KAGC/TM 1118/FL015/TP P68/RM BASES 1500 ILS RWY 28
- Report
- a routine report filed through AGC
- Where
- over KAGC
- Time
- 11:18 UTC
- Height
- at 1,500 ft
- Aircraft
- P68
- Remarks
- bases 1500 ils runway 28
- GL7T at 1,500 ft, 10 nm south, 5:02 am EDT (09:02 UTC): a routine report with nothing remarked on. 169 nm along the route, 10 nm south of the line.
as filed, and in English
AGC UA /OV KAGC/TM 0902/FL015/TP GL7T/SK B015
- Report
- a routine report filed through AGC
- Where
- over KAGC
- Time
- 09:02 UTC
- Height
- at 1,500 ft
- Aircraft
- GL7T
- Sky
- B015
- A320 climbing, 11 nm south, 7:15 am EDT (11:15 UTC): no icing, remarks: tops 4,200 ft. 189 nm along the route, 11 nm south of the line.
as filed, and in English
PIT UA /OV PIT280005/TM 1115/FLDURC/TP A320/IC NEG/RM TOPS 042
- Report
- a routine report filed through PIT
- Where
- 5 nm west (280°) of PIT
- Time
- 11:15 UTC
- Height
- during the climb
- Aircraft
- A320
- Icing
- none
- Remarks
- tops 4,200 ft
- B007T034 , 22 nm southwest, 7:10 am EDT (11:10 UTC): a routine report with nothing remarked on. 259 nm along the route, 22 nm southwest of the line.
as filed, and in English
CAK UA /OV BJJ280001/TM 1110/FLC210/TP B007 T034
- Report
- a routine report filed through CAK
- Where
- 1 nm west (280°) of BJJ
- Time
- 11:10 UTC
- Height
- at C210
- Aircraft
- B007 T034
- BE40 descending, 6 nm northwest, 7:03 am EDT (11:03 UTC): a routine report with nothing remarked on. 269 nm along the route, 6 nm northwest of the line.
as filed, and in English
CLE UA /OV CLE230005/TM 1103/FLDURD/TP BE40/SK B020 T031
- Report
- a routine report filed through CLE
- Where
- 5 nm southwest (230°) of CLE
- Time
- 11:03 UTC
- Height
- during the descent
- Aircraft
- BE40
- Sky
- B020 T031
- A21N descending, 6 nm northwest, 6:11 am EDT (10:11 UTC): no turbulence, 12 °C. 269 nm along the route, 6 nm northwest of the line.
as filed, and in English
CLE UA /OV CLE230005/TM 1011/FLDURD/TP A21N/SK B018 T035/TA +12/TB SMOOTH
- Report
- a routine report filed through CLE
- Where
- 5 nm southwest (230°) of CLE
- Time
- 10:11 UTC
- Height
- during the descent
- Aircraft
- A21N
- Sky
- B018 T035
- Temperature
- +12
- Turbulence
- smooth
- UAL2759 at 35,000 ft, 37 nm northeast, 7:14 am EDT (11:14 UTC): no turbulence, wind 313° at 72 knots. 289 nm along the route, 37 nm northeast of the line.
as filed, and in English
ARP UAL2759 4155N 08149W 1114 F350 313/072KT TB SMTH IC
- Report
- a routine report filed through ARP
- B739 at 9,000 ft, 49 nm north, 6:33 am EDT (10:33 UTC): no turbulence, no icing, clear from 9,000 ft to 60,000 ft, wind 295° at 13 knots, remarks: during the descent. 349 nm along the route, 49 nm north of the line.
as filed, and in English
DTW UA /OV DXO033026/TM 1033/FL090/TP B739/SK SKC/WV 29513KTS/TB NEG/IC NEG/RM DURD
- Report
- a routine report filed through DTW
- Where
- 26 nm northeast (033°) of DXO
- Time
- 10:33 UTC
- Height
- at 9,000 ft
- Aircraft
- B739
- Sky
- clear
- Wind
- from 295° at 13 knots
- Turbulence
- none
- Icing
- none
- Remarks
- during the descent
- MD83 at 2,500 ft, 20 nm south, 6:43 am EDT (10:43 UTC): clear from 2,500 ft to 60,000 ft, remarks: base 1,000 ft tops 2,500 ft clear above. 359 nm along the route, 20 nm south of the line.
as filed, and in English
TOL UA /OV TOL/TM 1043/FL025/TP MD83/RM BASE 010 TOPS 025 CLEAR ABOVE
- Report
- a routine report filed through TOL
- Where
- over TOL
- Time
- 10:43 UTC
- Height
- at 2,500 ft
- Aircraft
- MD83
- Remarks
- base 1,000 ft tops 2,500 ft clear above
2 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 | 10:10 pm PDT (05:10 UTC) |
| 6,500 ft | 280° at 7 kt | +7 kt | 9 °C | 113 kt | 17 h 55 min | 10:20 pm PDT (05:20 UTC) |
| 8,500 ft | 260° at 9 kt | +8 kt | 6 °C | 112 kt | 18 h 04 min | 10:29 pm PDT (05:29 UTC) |
| 10,500 ft | 260° at 11 kt | +10 kt | 2 °C | 110 kt | 18 h 24 min | 10:49 pm PDT (05:49 UTC) |
| 12,500 ft | 270° at 13 kt | +13 kt | -1 °C | 107 kt | 18 h 55 min | 11:20 pm PDT (06:20 UTC) |
| 14,500 ft | 270° at 14 kt | +14 kt | -5 °C | 106 kt | 19 h 06 min | 11:31 pm PDT (06:31 UTC) |
| 16,500 ft | 270° at 16 kt | +16 kt | -9 °C | 104 kt | 19 h 28 min | 11:53 pm PDT (06:53 UTC) |
| 18,000 ft FL180 | 270° at 17 kt | +17 kt | -12 °C | 103 kt | 19 h 39 min | 12:04 am PDT (07:04 UTC) |
| 24,000 ft FL240 | 270° at 21 kt | +21 kt | -24 °C | 99 kt | 20 h 27 min | 12:52 am PDT (07:52 UTC) |
| 30,000 ft FL300 | 270° at 24 kt | +24 kt | -36 °C | 96 kt | 21 h 05 min | 1:30 am PDT (08:30 UTC) |
| 34,000 ft FL340 | 270° at 34 kt | +35 kt | -41 °C | 85 kt | 23 h 49 min | 4:14 am PDT (11:14 UTC) |
| 39,000 ft FL390 | 270° at 43 kt | +44 kt | -47 °C | 76 kt | 26 h 38 min | 7:03 am PDT (14:03 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; 83 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; 70 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; 43 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; 61 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; 63 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 1147 nm out; 61 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; 37 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 1446 nm out; 78 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; 60 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 1745 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; 65 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; 55 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 | Wind | Visibility | Ceiling | Elevation | Reported |
|---|---|---|---|---|---|---|---|
| BWI Baltimore, MD | departure | marginal VFR Sky: overcast at 1,200 feet | from the west-northwest (300°) at 6 knots | 10+ mi | 1,200 ft | 143 ft | 6:54 am EDT (10:54 UTC) |
| HGR Hagerstown, MD | 60 nm out, 4 nm northeast of the line, tower | marginal VFR Sky: overcast at 3,000 feet | from the west-northwest (290°) at 8 knots | 10+ mi | 3,000 ft | 703 ft | 11:20 UTC |
| JXN Jackson, MI | 399 nm out, 5 nm north of the line, tower | marginal VFR Weather: mist | from the south-southwest (210°) at 3 knots | 3 mi | none | 1,000 ft | 10:56 UTC |
| BTL Battle Creek, MI | 429 nm out, 8 nm southwest of the line, tower | VFR | from the south-southwest (210°) at 7 knots | 8 mi | none | 951 ft | 10:53 UTC |
| CMY Sparta, WI | 698 nm out, 7 nm southeast of the line, tower | VFR Sky: scattered clouds at 19,000 feet | calm | 10+ mi | none | 839 ft | 10:55 UTC |
| FCM Minneapolis, MN | 818 nm out, 7 nm north of the line, tower | VFR | from the west-southwest (240°) at 4 knots | 10+ mi | none | 906 ft | 10:53 UTC |
| ASY Ashley, ND | 1077 nm out, 7 nm north of the line | no report just now | 2,034 ft | ||||
| BHK Baker, MT | 1286 nm out, 18 nm south of the line | IFR Sky: overcast at 600 feet Weather: light rain | from the east (080°) at 5 knots | 10+ mi | 600 ft | 2,980 ft | 10:59 UTC |
| GTF Great Falls, MT | 1585 nm out, 12 nm northeast of the line, tower | low IFR Sky: overcast at 400 feet Weather: mist | from the northwest (320°) at 6 knots | 1.75 mi | 400 ft | 3,680 ft | 11:18 UTC |
| THM Thompson Falls, MT | 1735 nm out, 7 nm northwest of the line | no report just now | 2,467 ft | ||||
| GEG Spokane, WA | 1834 nm out, 8 nm northeast of the line, tower | VFR Sky: a few clouds at 5,000 feet, scattered clouds at 8,500 feet, a broken layer at 10,000 feet | from the northeast (040°) at 6 knots | 10+ mi | 10,000 ft | 2,385 ft | 10:53 UTC |
| SEA Seattle, WA | destination | VFR | from the southeast (130°) at 6 knots | 10+ mi | none | 432 ft | 3:53 am PDT (10:53 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 SEA when you get there the forecast at the estimated arrival, 10:10 pm PDT (05:10 UTC)
Wind from the south at 4 knots, visibility more than 6 miles, scattered clouds at 25,000 feet VFR
The whole forecast for SEA
- From Mon 5:00 am PDT (12:00 UTC): wind from the southeast at 5 knots, visibility more than 6 miles, clear skies
- From Mon 9:00 am PDT (16:00 UTC): wind light and variable, 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
- From Tue 4:00 am PDT (11:00 UTC): wind from the south at 5 knots, visibility more than 6 miles, overcast at 10,000 feet
The forecast for BWI, the departure
- From Mon 6:00 am EDT (10:00 UTC): wind from the north at 7 knots, visibility more than 6 miles, overcast at 1,300 feet
- From Mon 10:00 am EDT (14:00 UTC): wind from the north-northwest at 12 knots, gusting to 20, visibility more than 6 miles, overcast at 1,400 feet
- From Mon 1:00 pm EDT (17:00 UTC): wind from the northwest at 10 knots, gusting to 18, visibility more than 6 miles, scattered clouds at 1,500 feet, overcast at 2,500 feet
- From Mon 4:00 pm EDT (20:00 UTC): wind from the west-northwest at 9 knots, visibility more than 6 miles, scattered clouds at 2,500 feet, a broken layer at 3,500 feet
- From Mon 8:00 pm EDT (00:00 UTC): wind from the west at 5 knots, visibility more than 6 miles, scattered clouds at 4,000 feet
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 7 nm from the route, 219 nm along the route · a VIP movement · today · ZOB
- 6/8927 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local 1 nm from the route, 1685 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 19 nm from the route, 1705 nm along the route · a VIP movement · starts Wednesday 14 October · ZLC
Daylight
Sunset at BWI 6:32 pm EDT (22:32 UTC), at SEA 6:25 pm PDT (01:25 UTC) (civil twilight ends 6:56 pm PDT (01:56 UTC)). At 120 knots the arrival at SEA is after sunset there (6:27 pm PDT (01:27 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: Baltimore/Washington International Thurgood Marshall, Seattle-Tacoma International.