Plan a flight · Sun 11:28 pm EDT (03:28 UTC)

Washington Dulles International to Seattle-Tacoma International IAD → SEA

1,999 nautical miles (2,300 statute miles) northwest on a straight line, true course 300°, about 310° magnetic at the departure end (variation 10W). At 120 knots that is 16 h 40 min at the quickest height in today's winds (4,500 ft, no wind along the track), arriving about 1:08 pm PDT (20:08 UTC). Right now IAD is IFR, wind from the north-northwest (340°) at 10 knots; SEA is VFR, wind from the north-northeast (030°) at 8 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: 3,675 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 E11E: thunderstorms (a convective SIGMET) up to 34,000 ft, moving from the southwest at 20 knots, until 12:55 am EDT (04:55 UTC). Over the first 80 nm of the route.

as issued

WSUS31 KKCI 120255
MKCE WST 120255
CONVECTIVE SIGMET 11E
VALID UNTIL 0455Z
NY NJ PA DE MD VA DC WV AND DE NJ NY MD CT VA CSTL WTRS
FROM 20NE JFK-90SE SIE-20NNW ORF-30ENE EKN-10S JST-20NE JFK
AREA EMBD TS MOV FROM 24020KT. TOPS TO FL340.

SIGMET 1C: thunderstorms (a convective SIGMET) up to 30,000 ft, moving from the southwest at 40 knots, until 12:55 am EDT (04:55 UTC). Over the route from 1209 to 1239 nm out.
as issued
```
WSUS32 KKCI 120255
MKCC WST 120255
CONVECTIVE SIGMET 1C
VALID UNTIL 0455Z
SD ND MT WY
FROM 30WSW DIK-50NW DPR-60WNW RAP-50ENE SHR-30WSW DIK
AREA TS MOV FROM 22040KT. TOPS TO FL300.
```
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 450 nm of the route.
AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the first 160 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 30 to 160 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 899 to 999 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 1079 to 1729 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1449 to 1759 nm out.
AIRMET ZULU 2C: moderate icing up to 20,000 ft. Over the route from 1509 to 1939 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 1539 to 1739 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 160 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 IAD.

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

B38M at 20,000 ft, 3 nm southwest, 11:11 pm EDT (03:11 UTC): moderate clear-air turbulence from 20,000 ft to 25,000 ft. At the departure end, 3 nm southwest of the line.
as filed, and in English
```
IAD UA /OV AML300020/TM 0311/FL200/TP B38M/TB MOD CAT 200-250
```
Report
a routine report filed through IAD
Where
20 nm northwest (300°) of AML
Time
03:11 UTC
Height
at 20,000 ft
Aircraft
B38M
Turbulence
moderate clear-air turbulence from 20,000 ft to 25,000 ft
B38M at 29,000 ft, 16 nm south, 8:55 pm EDT (00:55 UTC): moderate turbulence above 29,000 ft, remarks: zob. 140 nm along the route, 16 nm south of the line.
as filed, and in English
```
MPG UA /OV AIR120030/TM 0055/FL290/TP B38M /TB OCNL MOD 290/RM ZOB
```
Report
a routine report filed through MPG
Where
30 nm southeast (120°) of AIR
Time
00:55 UTC
Height
at 29,000 ft
Aircraft
B38M
Turbulence
occasional moderate at 29,000 ft
Remarks
zob
A320 at 33,000 ft, 18 nm north, 8:36 pm EDT (00:36 UTC): moderate turbulence above 33,000 ft, remarks: zob. 400 nm along the route, 18 nm north of the line.
as filed, and in English
```
JXN UA /OV JXN280030/TM 0036/FL330/TP A320/TB OCNL MOD 330/RM ZOB
```
Report
a routine report filed through JXN
Where
30 nm west (280°) of JXN
Time
00:36 UTC
Height
at 33,000 ft
Aircraft
A320
Turbulence
occasional moderate at 33,000 ft
Remarks
zob
B712 descending, 39 nm east, 11:10 pm EDT (03:10 UTC): remarks: light rain light chop bases 50,000 ft ft. At the departure end, 39 nm east of the line.
as filed, and in English
```
BWI UA /OV RWY 15R/TM 0310/FLDURD/TP B712/RM LIGHT RAIN. LIGHT CHOP. BASES 500 FT
```
Report
a routine report filed through BWI
Where
runway 15R
Time
03:10 UTC
Height
during the descent
Aircraft
B712
Remarks
light rain light chop bases 50,000 ft ft
A320 at 2,000 ft, 39 nm east, 9:46 pm EDT (01:46 UTC): a broken layer from 30,000 ft to 4,500 ft, remarks: CONLE5 sid. At the departure end, 39 nm east of the line.
as filed, and in English
```
BWI UA /OV BAL180005/TM 0146/FL020/TP A320/SK BKN003-TOP045/RM CONLE5 SID
```
Report
a routine report filed through BWI
Where
5 nm south (180°) of BAL
Time
01:46 UTC
Height
at 2,000 ft
Aircraft
A320
Sky
a broken layer from 300 ft, tops 4,500 ft
Remarks
CONLE5 sid
B738 at 2,000 ft, 37 nm east, 9:43 pm EDT (01:43 UTC): a broken layer from 40,000 ft to 7,200 ft, remarks: TERPZ8 sid. At the departure end, 37 nm east of the line.
as filed, and in English
```
BWI UA /OV BAL260003/TM 0143/FL20/TP B738/SK BKN004-TOP072/RM TERPZ8 SID
```
Report
a routine report filed through BWI
Where
3 nm west (260°) of BAL
Time
01:43 UTC
Height
at 2,000 ft
Aircraft
B738
Sky
a broken layer from 400 ft, tops 7,200 ft
Remarks
TERPZ8 sid
B38M at 400 ft, 20 nm east, 9:15 pm EDT (01:15 UTC): overcast above 40,000 ft. At the departure end, 20 nm east of the line.
as filed, and in English
```
DCA UA /OV DCA/TM 0115/FL004/TP B38M/SK OVC004
```
Report
a routine report filed through DCA
Where
over DCA
Time
01:15 UTC
Height
at 400 ft
Aircraft
B38M
Sky
overcast from 400 ft
FA8X climbing, 5 nm west, 8:34 pm EDT (00:34 UTC): overcast above 1,000 ft. At the departure end, 5 nm west of the line.
as filed, and in English
```
IAD UA /OV AML300005/TM 0034/FLDURC/TP FA8X/SK OVC010
```
Report
a routine report filed through IAD
Where
5 nm northwest (300°) of AML
Time
00:34 UTC
Height
during the climb
Aircraft
FA8X
Sky
overcast from 1,000 ft
E75S at 22,000 ft, 41 nm northeast, 10:51 pm EDT (02:51 UTC): light to moderate turbulence, remarks: zob. 100 nm along the route, 41 nm northeast of the line.
as filed, and in English
```
JST UA /OV JST/TM 0251/FL220/TP E75S/TB LGHT-MOD/RM ZOB
```
Report
a routine report filed through JST
Where
over JST
Time
02:51 UTC
Height
at 22,000 ft
Aircraft
E75S
Turbulence
lght-mod
Remarks
zob
C68A at 2,700 ft, 20 nm northeast, 8:45 pm EDT (00:45 UTC): overcast above 2,700 ft, remarks: landing runway 10R. 160 nm along the route, 20 nm northeast of the line.
as filed, and in English
```
PIT UA /OV KPIT/TM 0045/FL027/TP C68A/SK OVC027/RM LANDING RWY 10R
```
Report
a routine report filed through PIT
Where
over KPIT
Time
00:45 UTC
Height
at 2,700 ft
Aircraft
C68A
Sky
overcast from 2,700 ft
Remarks
landing runway 10R
CRJ7 descending, 17 nm northeast, 9:17 pm EDT (01:17 UTC): remarks: bases 2,000 ft. 220 nm along the route, 17 nm northeast of the line.
as filed, and in English
```
CAK UA /OV CAK/TM 0117/FLDURD/TP CRJ7/RM BASES 020
```
Report
a routine report filed through CAK
Where
over CAK
Time
01:17 UTC
Height
during the descent
Aircraft
CRJ7
Remarks
bases 2,000 ft
PA44 descending, 6 nm north, 10:27 pm EDT (02:27 UTC): a broken layer from 900 ft to 1,500 ft; a broken layer from 2,600 ft to 3,500 ft, fog. 330 nm along the route, 6 nm north of the line.
as filed, and in English
```
TOL UA /OV TOL/TM 0227/FLDURD/TP PA44/SK BKN009 TOPS015 BKN026 TOPS035/WX FG
```
Report
a routine report filed through TOL
Where
over TOL
Time
02:27 UTC
Height
during the descent
Aircraft
PA44
Sky
BKN009 TOPS015 BKN026 TOPS035
Weather
fog
CRJ7 at 600 ft, 48 nm northeast, 10:07 pm EDT (02:07 UTC): a broken layer above 1,500 ft. 330 nm along the route, 48 nm northeast of the line.
as filed, and in English
```
DTW UA /OV DTW/TM 0207/FLSFC/TP CRJ7/SK BKN 015
```
Report
a routine report filed through DTW
Where
over DTW
Time
02:07 UTC
Height
at the surface
Aircraft
CRJ7
Sky
a broken layer from 1,500 ft
C525 descending, 6 nm north, 9:41 pm EDT (01:41 UTC): a routine report with nothing remarked on. 330 nm along the route, 6 nm north of the line.
as filed, and in English
```
TOL UA /OV TOL/TM 0141/FLDURD/TP C525/SK TOPS035 BKN010/WX 2SM
```
Report
a routine report filed through TOL
Where
over TOL
Time
01:41 UTC
Height
during the descent
Aircraft
C525
Sky
TOPS035 BKN010
Weather
2SM

11 more routine reports are on the map.

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 (EKN, 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	220° at 2 kt	0	3 °C	120 kt	16 h 40 min	1:08 pm PDT (20:08 UTC)
6,500 ft	260° at 3 kt	+2 kt	9 °C	118 kt	16 h 56 min	1:24 pm PDT (20:24 UTC)
8,500 ft	260° at 4 kt	+4 kt	6 °C	116 kt	17 h 14 min	1:42 pm PDT (20:42 UTC)
10,500 ft	250° at 8 kt	+6 kt	2 °C	114 kt	17 h 32 min	2:00 pm PDT (21:00 UTC)
12,500 ft	240° at 11 kt	+9 kt	-1 °C	111 kt	18 h 01 min	2:29 pm PDT (21:29 UTC)
14,500 ft	250° at 14 kt	+12 kt	-5 °C	108 kt	18 h 31 min	2:59 pm PDT (21:59 UTC)
16,500 ft	260° at 17 kt	+16 kt	-9 °C	104 kt	19 h 13 min	3:41 pm PDT (22:41 UTC)
18,000 ft FL180	260° at 19 kt	+18 kt	-12 °C	102 kt	19 h 36 min	4:04 pm PDT (23:04 UTC)
24,000 ft FL240	260° at 21 kt	+20 kt	-23 °C	100 kt	19 h 59 min	4:27 pm PDT (23:27 UTC)
30,000 ft FL300	270° at 24 kt	+24 kt	-37 °C	96 kt	20 h 49 min	5:17 pm PDT (00:17 UTC)
34,000 ft FL340	270° at 35 kt	+35 kt	-42 °C	85 kt	23 h 31 min	7:59 pm PDT (02:59 UTC)
39,000 ft FL390	270° at 43 kt	+44 kt	-48 °C	76 kt	26 h 18 min	10:46 pm PDT (05:46 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
EKN	used from 0 nm out; 91 nm from the line		330/21 12°	330/25 7°	350/22 2°	330/24 -10°	310/27 -21°	320/33 -35°	290/31 -39°	290/34 -47°
AGC	used from 100 nm out; 25 nm from the line	350/14	330/20 11°	340/18 8°	330/17 3°	340/22 -11°	340/31 -22°	330/33 -36°	300/34 -41°	300/35 -47°
CLE	used from 200 nm out; 42 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°
FWA	used from 300 nm out; 72 nm from the line	300/17	320/20 16°	330/20 10°	340/15 3°	310/27 -8°	320/37 -20°	330/52 -36°	330/65 -43°	330/60 -50°
MKG	used from 400 nm out; 64 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 550 nm out; 87 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 600 nm out; 63 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 749 nm out; 34 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 849 nm out; 61 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 949 nm out; 33 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 1099 nm out; 86 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 1249 nm out; 51 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°
BIL	used from 1399 nm out; 67 nm from the line		080/13	180/9 -2°	210/38 0°	220/51 -11°	210/46 -22°	210/58 -35°	230/73 -39°	230/72 -45°
GTF	used from 1499 nm out; 36 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 1649 nm out; 57 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 1749 nm out; 33 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 1899 nm out; 55 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 1949 nm out; 25 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
IAD Washington, DC	departure	IFR Sky: overcast at 600 feet Weather: light rain	from the north-northwest (340°) at 10 knots	10+ mi	600 ft	312 ft	10:52 pm EDT (02:52 UTC)
HLG Wheeling, WV	160 nm out, 8 nm southwest of the line, tower	marginal VFR Sky: overcast at 1,800 feet	from the north-northeast (020°) at 4 knots	8 mi	1,800 ft	1,194 ft	03:19 UTC
TOL Toledo, OH	330 nm out, 6 nm north of the line, tower	low IFR Sky: overcast at 400 feet Weather: light drizzle, mist	from the west-northwest (290°) at 3 knots	5 mi	400 ft	683 ft	02:52 UTC
MKE Milwaukee, WI	530 nm out, 6 nm north of the line, tower	VFR Sky: a few clouds at 25,000 feet	from the south-southwest (200°) at 9 knots	10+ mi	none	728 ft	02:52 UTC
LSE La Crosse, WI	690 nm out, 4 nm northeast of the line, tower	VFR	from the south-southwest (200°) at 13 knots	10+ mi	none	655 ft	02:53 UTC
OVL Olivia, MN	859 nm out, 2 nm east of the line	VFR	from the west-northwest (290°) at 7 knots	10+ mi	none	1,079 ft	03:22 UTC
ABR Aberdeen, SD	1009 nm out, 3 nm southeast of the line	IFR Sky: overcast at 900 feet	from the northeast (040°) at 11 knots, gusting to 21	10+ mi	900 ft	1,301 ft	02:53 UTC
BHK Baker, MT	1259 nm out, 6 nm south of the line	IFR Sky: overcast at 700 feet Weather: light rain	from the east (090°) at 17 knots, gusting to 25	10+ mi	700 ft	2,980 ft	02:51 UTC
GTF Great Falls, MT	1559 nm out, 18 nm north of the line, tower	low IFR Sky: a few clouds at 300 feet, overcast at 700 feet Weather: light snow, mist	from the north-northeast (020°) at 10 knots	0.75 mi	700 ft	3,680 ft	02:53 UTC
THM Thompson Falls, MT	1709 nm out, 12 nm north of the line	no report just now				2,467 ft
GEG Spokane, WA	1809 nm out, 10 nm northeast of the line, tower	VFR Sky: a broken layer at 6,000 feet, a broken layer at 11,000 feet	from the northeast (040°) at 10 knots	10+ mi	6,000 ft	2,385 ft	02:53 UTC
SEA Seattle, WA	destination	VFR Sky: a few clouds at 3,000 feet	from the north-northeast (030°) at 8 knots	10+ mi	none	432 ft	7:53 pm PDT (02:53 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, 1:08 pm PDT (20:08 UTC)

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

The whole forecast for SEA

From Sun 8:00 pm PDT (03:00 UTC): wind from the north 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 northwest at 5 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

The forecast for IAD, the departure

From Sun 11:00 pm EDT (03:00 UTC): wind from the north-northwest at 10 knots, visibility 3 miles, light rain showers, mist, overcast at 600 feet
From Mon 6:00 am EDT (10:00 UTC): wind from the north-northwest at 11 knots, gusting to 19, visibility more than 6 miles, overcast at 1,400 feet
From Mon 12:00 pm EDT (16:00 UTC): wind from the north-northwest at 13 knots, gusting to 21, visibility more than 6 miles, overcast at 2,100 feet
From Mon 2:00 pm EDT (18:00 UTC): wind from the north-northwest at 10 knots, gusting to 17, visibility more than 6 miles, a broken layer at 4,000 feet
From Mon 7:00 pm EDT (23:00 UTC): wind from the northwest at 6 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

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

4/9383 WASHINGTON, DC., USA 8 nm from the route, at the departure end · security · ZDC
6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 4 nm from the route, at the departure end · a VIP movement · today · ZDC
6/8829 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 14 nm from the route, 190 nm along the route · a VIP movement · today · ZOB
6/8587 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 14 nm from the route, 190 nm along the route · a VIP movement · today · ZOB

Daylight

Sunset at IAD 6:36 pm EDT (22:36 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

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: Washington Dulles International, Seattle-Tacoma International.