Philadelphia International to Boeing Fld/King County International PHL → BFI
2,061 nautical miles (2,371 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 02 min at the quickest height in today's winds (4,500 ft, a 1-knot tailwind), arriving about 12:46 pm PDT (19:46 UTC). 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 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 6E: thunderstorms (a convective SIGMET) up to 30,000 ft, moving from the southwest at 20 knots, until 11:55 pm EDT (03:55 UTC). Over the first 70 nm of the route.
as issued
WSUS31 KKCI 120155 MKCE WST 120155 CONVECTIVE SIGMET 6E VALID UNTIL 0355Z NY NJ PA DE MD AND DE NJ NY MD CSTL WTRS FROM 20WNW SAX-70S HTO-50ESE SBY-30WSW HAR-20WNW SAX AREA EMBD TS MOV FROM 22020KT. 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 408 nm of the route.
- AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the route from 20 to 249 nm out.
- AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 80 to 219 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 976 to 1075 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 1205 to 1772 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 1224 to 1792 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1523 to 1822 nm out.
- AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 1573 to 1951 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 159 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 PHL.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
Not fetched just now.
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 19 forecast points nearest it (ACY, AVP, PSB, AGC, 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 | 180° at 2 kt | −1 kt | 3 °C | 121 kt | 17 h 02 min | 12:46 pm PDT (19:46 UTC) |
| 6,500 ft | 240° at 2 kt | +1 kt | 9 °C | 119 kt | 17 h 19 min | 1:03 pm PDT (20:03 UTC) |
| 8,500 ft | 240° at 4 kt | +3 kt | 6 °C | 117 kt | 17 h 37 min | 1:21 pm PDT (20:21 UTC) |
| 10,500 ft | 230° at 7 kt | +5 kt | 2 °C | 115 kt | 17 h 55 min | 1:39 pm PDT (20:39 UTC) |
| 12,500 ft | 240° at 10 kt | +7 kt | -1 °C | 113 kt | 18 h 14 min | 1:58 pm PDT (20:58 UTC) |
| 14,500 ft | 250° at 13 kt | +11 kt | -5 °C | 109 kt | 18 h 54 min | 2:38 pm PDT (21:38 UTC) |
| 16,500 ft | 250° at 17 kt | +15 kt | -9 °C | 105 kt | 19 h 38 min | 3:22 pm PDT (22:22 UTC) |
| 18,000 ft FL180 | 260° at 19 kt | +18 kt | -12 °C | 102 kt | 20 h 12 min | 3:56 pm PDT (22:56 UTC) |
| 24,000 ft FL240 | 250° at 22 kt | +20 kt | -23 °C | 100 kt | 20 h 37 min | 4:21 pm PDT (23:21 UTC) |
| 30,000 ft FL300 | 260° at 26 kt | +24 kt | -37 °C | 96 kt | 21 h 28 min | 5:12 pm PDT (00:12 UTC) |
| 34,000 ft FL340 | 260° at 36 kt | +34 kt | -43 °C | 86 kt | 23 h 58 min | 7:42 pm PDT (02:42 UTC) |
| 39,000 ft FL390 | 260° at 46 kt | +45 kt | -48 °C | 75 kt | 27 h 29 min | 11:13 pm PDT (06:13 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; 64 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; 68 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; 20 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° | |
| AGC | used from 199 nm out; 75 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 249 nm out; 64 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 398 nm out; 112 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 597 nm out; 19 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 697 nm out; 71 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 796 nm out; 42 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 896 nm out; 33 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 1045 nm out; 54 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 1145 nm out; 97 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 1344 nm out; 55 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 1394 nm out; 53 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 1493 nm out; 100 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 1692 nm out; 41 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 1792 nm out; 51 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 1941 nm out; 68 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 1991 nm out; 46 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 |
|---|---|---|---|---|---|---|---|
| PHL Philadelphia, PA | departure | no report just now | 35 ft | ||||
| UNV State College, PA | 129 nm out, 5 nm west of the line, tower | no report just now | 1,231 ft | ||||
| PTK Pontiac, MI | 408 nm out, 12 nm south of the line, tower | no report just now | 980 ft | ||||
| FNT Flint, MI | 428 nm out, 3 nm southeast of the line, tower | no report just now | 782 ft | ||||
| ATW Appleton, WI | 647 nm out, 5 nm south of the line, tower | no report just now | 918 ft | ||||
| STC St Cloud, MN | 896 nm out, 4 nm south of the line, tower | no report just now | 1,030 ft | ||||
| BIS Bismarck, ND | 1185 nm out, 4 nm northeast of the line, tower | no report just now | 1,661 ft | ||||
| GDV Glendive, MT | 1354 nm out, 5 nm southeast of the line | no report just now | 2,458 ft | ||||
| GTF Great Falls, MT | 1623 nm out, 10 nm southeast of the line, tower | no report just now | 3,680 ft | ||||
| COE Coeur D'Alene, ID | 1842 nm out, 5 nm northeast of the line | no report just now | 2,320 ft | ||||
| SFF Spokane, WA | 1862 nm out, 3 nm southeast of the line, tower | no report just now | 1,956 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, 12:46 pm PDT (19:46 UTC)
BFI has no terminal forecast; use the nearest airport that does.
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 12 nm from the route, 259 nm along the route · a VIP movement · today · ZOB
- 6/8587 Youngstown, OH, Monday, October 12, 2026 through Monday, October 12, 2026 Local 12 nm from the route, 259 nm along the route · a VIP movement · today · ZOB
- 6/6656 ANOKA, MN, Monday, October 5, 2026 through Monday, October 19, 2026 Local 15 nm from the route, 856 nm along the route · security · until 19 October · ZMP
Daylight
Sunset at PHL 6:26 pm EDT (22:26 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
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: Philadelphia International, Boeing Fld/King County International.