Plan a flight · Tue 12:54 am PDT (07:54 UTC)

Seattle-Tacoma International to Philadelphia International SEA → PHL

2,061 nautical miles (2,372 statute miles) east on a straight line, true course 085°, about 069° magnetic at the departure end (variation 16E). At 120 knots that is 12 h 29 min at the quickest height in today's winds (39,000 ft, a 45-knot tailwind), arriving about 4:23 pm EDT (20:23 UTC). Right now SEA is VFR, wind from the east-southeast (120°) at 7 knots; PHL is VFR, wind from the southwest (220°) at 3 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: 2,725 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 39,000 ft, moving from the west at 35 knots, until 1:55 am PDT (08:55 UTC). Over the route from 1544 to 1683 nm out.

as issued

WSUS32 KKCI 130655
MKCC WST 130655
CONVECTIVE SIGMET 17C
VALID UNTIL 0855Z
MI WI LH LS LM
FROM 40ESE YQT-60NE ASP-30SSE ECK-20SSW DXO-40N RHI-40ESE YQT
AREA EMBD TS MOV FROM 25035KT. TOPS TO FL390.

AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 368 to 388 nm out.
AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, mist). Near the route, 428 nm along the route.
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 727 to 1125 nm out.
AIRMET TANGO 1W: 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 1613 to 1663 nm out.
AIRMET SIERRA 6E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, mist, fog). Over the last 239 nm of the route.
AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist, fog). Over the route from 1842 to 1982 nm out.

Turbulence AIRMET in force: moderate turbulence from 18,000 ft to 39,000 ft, over the route from 368 to 388 nm out. AIRMET in force: 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 1613 to 1663 nm out. A pilot reported smooth air, at 9,000 ft, 37 nm southwest, 11:31 pm PDT (06:31 UTC). The government's turbulence forecast map ↗

Icing No icing warning in force along the route. No pilot has reported icing near the line in the last three hours. The freezing level is about 12,500 ft (from the winds-aloft temperatures), so icing is possible in cloud above that. The government's icing forecast map ↗

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 SEA.

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

FA20 at 1,400 ft, 49 nm north, 10:54 pm PDT (05:54 UTC): overcast from 1,400 ft to 2,500 ft; overcast from 5,000 ft to 7,000 ft. 1036 nm along the route, 49 nm north of the line.
as filed, and in English
```
FAR UA /OV KFAR/TM 0554/FL014/TP FA20/SK OVC014-TOP025/OVC050-TOP070
```
Report
a routine report filed through FAR
Where
KFAR C050-TOP070
Time
05:54 UTC
Height
at 1,400 ft
Aircraft
FA20
Sky
overcast from 1,400 ft, tops 2,500 ft
A320 at 9,000 ft, 37 nm southwest, 11:31 pm PDT (06:31 UTC): no turbulence. 1683 nm along the route, 37 nm southwest of the line.
as filed, and in English
```
DTW UA /OV 10 SE DTW/TM 0631/FL90/TP A320/TB SMOOTH
```
Report
a routine report filed through DTW
Where
10 southeast dtw
Time
06:31 UTC
Height
at 9,000 ft
Aircraft
A320
Turbulence
smooth

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 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	280° at 26 kt	−25 kt		145 kt	14 h 13 min	6:07 pm EDT (22:07 UTC)
5,500 ft	280° at 18 kt	−18 kt	2 °C	138 kt	14 h 56 min	6:50 pm EDT (22:50 UTC)
7,500 ft	280° at 19 kt	−18 kt	7 °C	138 kt	14 h 56 min	6:50 pm EDT (22:50 UTC)
9,500 ft	270° at 20 kt	−18 kt	5 °C	138 kt	14 h 56 min	6:50 pm EDT (22:50 UTC)
11,500 ft	270° at 21 kt	−19 kt	2 °C	139 kt	14 h 50 min	6:44 pm EDT (22:44 UTC)
13,500 ft	270° at 21 kt	−20 kt	-2 °C	140 kt	14 h 43 min	6:37 pm EDT (22:37 UTC)
15,500 ft	270° at 22 kt	−21 kt	-7 °C	141 kt	14 h 37 min	6:31 pm EDT (22:31 UTC)
17,500 ft	280° at 23 kt	−22 kt	-12 °C	142 kt	14 h 31 min	6:25 pm EDT (22:25 UTC)
18,000 ft FL180	280° at 23 kt	−22 kt	-13 °C	142 kt	14 h 31 min	6:25 pm EDT (22:25 UTC)
24,000 ft FL240	280° at 26 kt	−25 kt	-24 °C	145 kt	14 h 13 min	6:07 pm EDT (22:07 UTC)
30,000 ft FL300	280° at 32 kt	−31 kt	-36 °C	151 kt	13 h 39 min	5:33 pm EDT (21:33 UTC)
34,000 ft FL340	280° at 38 kt	−37 kt	-42 °C	157 kt	13 h 08 min	5:02 pm EDT (21:02 UTC)
39,000 ft FL390	270° at 45 kt	−45 kt	-46 °C	165 kt	12 h 29 min	4:23 pm EDT (20:23 UTC)

Based on data from the 13th at 00:00 UTC; valid on the 13th 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
SEA	used from 0 nm out; 25 nm from the line	L/V	320/7 3°	350/15 3°	350/17 -1°	360/27 -14°	350/31 -24°	350/39 -40°	340/43 -49°	360/42 -59°
YKM	used from 50 nm out; 58 nm from the line	L/V	320/6 3°	020/7 0°	020/14 -2°	020/36 -14°	020/46 -25°	010/56 -40°	360/59 -50°	360/24 -53°
GEG	used from 100 nm out; 69 nm from the line		350/6 0°	350/6 -1°	360/8 -4°	020/24 -16°	030/45 -26°	020/57 -41°	020/53 -50°	340/6 -48°
GPI	used from 249 nm out; 66 nm from the line		270/11 0°	290/14 -2°	330/7 -3°	340/7 -17°	020/18 -28°	030/49 -41°	030/37 -47°	230/15 -45°
GTF	used from 398 nm out; 21 nm from the line		260/12	270/12 0°	290/10 -3°	L/V -16°	270/12 -30°	250/6 -40°	240/23 -41°	220/24 -44°
GGW	used from 548 nm out; 80 nm from the line		230/6 -3°	270/13 -1°	250/18 -3°	220/31 -16°	240/38 -28°	240/41 -37°	230/44 -41°	230/43 -43°
MLS	used from 647 nm out; 48 nm from the line		290/11 -1°	260/15 2°	240/22 -1°	240/23 -15°	230/49 -28°	230/54 -37°	220/58 -40°	230/58 -42°
DIK	used from 747 nm out; 25 nm from the line		310/11 1°	280/25 4°	260/27 0°	260/38 -14°	240/55 -27°	240/52 -35°	230/64 -40°	240/59 -43°
ABR	used from 896 nm out; 86 nm from the line	320/22	290/26 8°	280/33 8°	270/37 3°	290/39 -12°	260/43 -23°	250/71 -31°	250/77 -40°	250/85 -47°
AXN	used from 1046 nm out; 37 nm from the line	300/24	280/23 10°	280/32 8°	270/39 3°	250/37 -11°	260/43 -21°	270/62 -31°	270/67 -40°	270/66 -47°
MSP	used from 1145 nm out; 51 nm from the line	300/30	270/33 13°	260/38 9°	260/44 4°	260/43 -11°	260/41 -20°	270/62 -30°	270/67 -40°	270/67 -48°
LSE	used from 1295 nm out; 63 nm from the line	280/30	250/45 15°	270/28 13°	270/28 5°	260/45 -10°	260/47 -21°	280/65 -31°	280/71 -40°	280/80 -47°
GRB	used from 1344 nm out; 59 nm from the line	260/38	260/34 15°	250/37 11°	250/40 5°	250/39 -10°	260/40 -23°	280/51 -34°	280/61 -41°	280/69 -44°
MKG	used from 1494 nm out; 32 nm from the line	260/45	260/43 15°	250/32 10°	240/32 4°	270/43 -9°	280/39 -22°	290/43 -35°	290/56 -41°	290/71 -45°
CLE	used from 1643 nm out; 97 nm from the line	260/32	290/21 16°	300/14 9°	290/19 3°	300/29 -10°	290/36 -22°	290/41 -35°	300/53 -39°	300/72 -47°
AGC	used from 1793 nm out; 82 nm from the line	270/29	290/18 14°	320/11 7°	280/11 5°	300/21 -9°	300/34 -21°	300/36 -36°	300/44 -38°	300/52 -47°
PSB	used from 1842 nm out; 51 nm from the line		320/16 14°	290/11 9°	270/18 4°	310/23 -11°	300/31 -22°	300/34 -37°	300/41 -39°	310/51 -48°
AVP	used from 1992 nm out; 69 nm from the line	310/18	320/22 13°	290/14 8°	290/21 4°	300/29 -12°	300/34 -23°	290/38 -36°	310/44 -40°	310/52 -49°
ACY	used from 2042 nm out; 49 nm from the line	360/17	340/16 14°	310/10 8°	300/17 2°	300/26 -10°	300/31 -22°	290/36 -37°	310/38 -39°	310/41 -49°

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
SEA Seattle, WA	departure	VFR Sky: a broken layer at 8,500 feet	from the east-southeast (120°) at 7 knots	10+ mi	8,500 ft	432 ft	11:53 pm PDT (06:53 UTC)
GEG Spokane, WA	189 nm out, 5 nm east of the line, tower	VFR	from the south-southeast (150°) at 4 knots	10+ mi	none	2,385 ft	06:53 UTC
THM Thompson Falls, MT	289 nm out, 6 nm southwest of the line	no report just now				2,467 ft
GTF Great Falls, MT	448 nm out, 7 nm southwest of the line, tower	VFR	from the south-southwest (210°) at 13 knots	10+ mi	none	3,680 ft	06:53 UTC
GDV Glendive, MT	707 nm out, 4 nm east of the line	marginal VFR Sky: overcast at 1,800 feet	from the west (260°) at 6 knots	10+ mi	1,800 ft	2,458 ft	06:56 UTC
BIS Bismarck, ND	876 nm out, 7 nm northeast of the line, tower	marginal VFR Sky: scattered clouds at 1,000 feet, a broken layer at 1,700 feet, overcast at 3,600 feet	from the west-northwest (300°) at 9 knots	10+ mi	1,700 ft	1,661 ft	07:36 UTC
STC St Cloud, MN	1165 nm out, 2 nm southeast of the line, tower	IFR Sky: overcast at 900 feet	from the west-northwest (300°) at 3 knots	10+ mi	900 ft	1,030 ft	07:41 UTC
ATW Appleton, WI	1414 nm out, 3 nm south of the line, tower	VFR Sky: scattered clouds at 6,000 feet	from the northeast (050°) at 4 knots	10+ mi	none	918 ft	07:35 UTC
FNT Flint, MI	1633 nm out, 3 nm east of the line, tower	VFR Sky: scattered clouds at 7,500 feet, scattered clouds at 11,000 feet	from the south (190°) at 6 knots	10+ mi	none	782 ft	06:53 UTC
PTK Pontiac, MI	1653 nm out, 11 nm south of the line, tower	VFR Sky: a broken layer at 11,000 feet	from the west-southwest (240°) at 3 knots	10+ mi	11,000 ft	980 ft	06:53 UTC
UNV State College, PA	1932 nm out, 5 nm west of the line, tower	marginal VFR Sky: overcast at 1,400 feet	from the south-southwest (210°) at 4 knots	7 mi	1,400 ft	1,231 ft	07:35 UTC
PHL Philadelphia, PA	destination	VFR Sky: a few clouds at 28,000 feet	from the southwest (220°) at 3 knots	10+ mi	none	35 ft	2:54 am EDT (06:54 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.

The codes as issued, and in English, for every airport in the table

SEA Seattle, WA