Plan a flight · Mon 5:21 am PDT (12:21 UTC)

Boeing Fld/King County International to St. Pete-Clearwater International BFI → PIE

2,185 nautical miles (2,515 statute miles) east on a straight line, true course 108°, about 093° magnetic at the departure end (variation 15E). At 120 knots that is 14 h 40 min at the quickest height in today's winds (34,000 ft, a 29-knot tailwind), arriving about 11:01 pm EDT (03:01 UTC), after sunset at the destination. Right now BFI is VFR, wind from the southeast (140°) at 4 knots; PIE is VFR, wind from the north (010°) at 4 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 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

AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 30 to 329 nm out.
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 170 to 409 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 180 to 748 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 239 to 549 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 429 to 679 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 709 to 888 nm out.
AIRMET TANGO 4W: moderate turbulence above 18,000 ft (due to mountain wave) from 34,000 ft to 43,000 ft. Over the route from 709 to 878 nm out.
AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Near the route, 709 nm along the route.
AIRMET TANGO 2W: moderate turbulence below 18,000 ft (due to mountain wave) up to 22,000 ft. Over the route from 728 to 818 nm out.
AIRMET TANGO 2W: 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 1038 to 1447 nm out.
AIRMET SIERRA 1E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, mist, fog). Over the route from 1686 to 1906 nm out.
AIRMET TANGO 2W: moderate turbulence above 18,000 ft from 30,000 ft to 41,000 ft. Over the route from 2076 to 2126 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 BFI.

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

BE9L at 17,000 ft, 18 nm north, 2:42 am PDT (09:42 UTC): light rime icing from 15,000 ft to 17,000 ft, 0 °C, remarks: zdvwc. 709 nm along the route, 18 nm north of the line.
as filed, and in English
```
CPR UA /OV DDY250025/TM 0942/FL170/TP BE9L/TA 00/IC LGT RIME 150-170/RM ZDVWC
```
Report
a routine report filed through CPR
Where
25 nm west (250°) of DDY
Time
09:42 UTC
Height
at 17,000 ft
Aircraft
BE9L
Temperature
0 °C
Icing
light rime from 15,000 ft to 17,000 ft
Remarks
zdvwc
E170 at 14,000 ft, 16 nm northeast, 4:19 am PDT (11:19 UTC): no turbulence, no icing, remarks: ZME65. 1557 nm along the route, 16 nm northeast of the line.
as filed, and in English
```
LIT UA /OV LIT045030/TM 1119/FL140/TP E170/TB NEG/IC NEG/RM ZME65
```
Report
a routine report filed through LIT
Where
30 nm northeast (045°) of LIT
Time
11:19 UTC
Height
at 14,000 ft
Aircraft
E170
Turbulence
none
Icing
none
Remarks
ZME65
E55P at 1,000 ft, 50 nm northeast, 4:04 am PDT (11:04 UTC): clear, remarks: fog. 2016 nm along the route, 50 nm northeast of the line.
as filed, and in English
```
TLH UA /OV TLH/TM 1104/FL010/TP E55P/SK CLR/RM FG
```
Report
a routine report filed through TLH
Where
over TLH
Time
11:04 UTC
Height
at 1,000 ft
Aircraft
E55P
Sky
clear
Remarks
fog
E170 at 2,000 ft, 50 nm northeast, 3:05 am PDT (10:05 UTC): clear, remarks: ground fog. 2016 nm along the route, 50 nm northeast of the line.
as filed, and in English
```
TLH UA /OV TLH/TM 1005/FL20/TP E170/SK CLR/RM GROUND FOG
```
Report
a routine report filed through TLH
Where
over TLH
Time
10:05 UTC
Height
at 2,000 ft
Aircraft
E170
Sky
clear
Remarks
ground fog
E55P at 25,000 ft, 27 nm northeast, 3:45 am PDT (10:45 UTC): light to moderate chop turbulence. 2066 nm along the route, 27 nm northeast of the line.
as filed, and in English
```
TLH UA /OV TLH165050/TM 1045/FL250/TP E55P/TB CONS LGT-MOD CHOP
```
Report
a routine report filed through TLH
Where
50 nm south (165°) of TLH
Time
10:45 UTC
Height
at 25,000 ft
Aircraft
E55P
Turbulence
continuous light to moderate chop
B737 at 21,000 ft, 46 nm northeast, 4:07 am PDT (11:07 UTC): no chop turbulence from 12,000 ft to 21,000 ft, clear from 21,000 ft to 60,000 ft. At the destination end, 46 nm northeast of the line.
as filed, and in English
```
CGC UA /OV CGC/TM 1107/FL210/TP B737/SK SKC/TB NEG CHOP 120-210
```
Report
a routine report filed through CGC
Where
over CGC
Time
11:07 UTC
Height
at 21,000 ft
Aircraft
B737
Sky
clear
Turbulence
no chop from 12,000 ft to 21,000 ft

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 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 17 forecast points nearest it (SEA, YKM, LWS, DLN, LND, BFF, GLD, SLN, ICT, TUL, FSM, LIT, MEM, JAN, MGM, TLH, PIE). 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	260° at 14 kt	−10 kt		130 kt	16 h 48 min	1:09 am EDT (05:09 UTC)
5,500 ft	270° at 17 kt	−14 kt		134 kt	16 h 18 min	12:39 am EDT (04:39 UTC)
7,500 ft	270° at 13 kt	−11 kt	8 °C	131 kt	16 h 41 min	1:02 am EDT (05:02 UTC)
9,500 ft	260° at 12 kt	−9 kt	6 °C	129 kt	16 h 56 min	1:17 am EDT (05:17 UTC)
11,500 ft	250° at 13 kt	−8 kt	3 °C	128 kt	17 h 04 min	1:25 am EDT (05:25 UTC)
13,500 ft	250° at 14 kt	−8 kt	-1 °C	128 kt	17 h 04 min	1:25 am EDT (05:25 UTC)
15,500 ft	250° at 14 kt	−8 kt	-5 °C	128 kt	17 h 04 min	1:25 am EDT (05:25 UTC)
17,500 ft	250° at 14 kt	−7 kt	-10 °C	127 kt	17 h 12 min	1:33 am EDT (05:33 UTC)
18,000 ft FL180	250° at 14 kt	−7 kt	-11 °C	127 kt	17 h 12 min	1:33 am EDT (05:33 UTC)
24,000 ft FL240	250° at 22 kt	−13 kt	-21 °C	133 kt	16 h 26 min	12:47 am EDT (04:47 UTC)
30,000 ft FL300	270° at 33 kt	−27 kt	-32 °C	147 kt	14 h 52 min	11:13 pm EDT (03:13 UTC)
34,000 ft FL340	270° at 34 kt	−29 kt	-38 °C	149 kt	14 h 40 min	11:01 pm EDT (03:01 UTC)
39,000 ft FL390	260° at 31 kt	−26 kt	-47 °C	146 kt	14 h 58 min	11:19 pm EDT (03:19 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
SEA	used from 0 nm out; 24 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°
YKM	used from 50 nm out; 33 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°
LWS	used from 150 nm out; 54 nm from the line	L/V	340/5 -3°	L/V -6°	040/7 -10°	100/23 -22°	180/30 -31°	190/11 -34°	200/11 -36°	220/23 -40°
DLN	used from 349 nm out; 56 nm from the line			190/10 -4°	220/23 -4°	210/21 -18°	210/43 -28°	210/60 -33°	210/72 -37°	210/67 -44°
LND	used from 549 nm out; 73 nm from the line			240/10 3°	240/30 0°	220/42 -13°	230/52 -23°	220/54 -33°	220/52 -36°	220/53 -44°
BFF	used from 748 nm out; 96 nm from the line		280/28	260/39 11°	240/34 5°	210/38 -11°	210/52 -22°	230/61 -31°	230/61 -36°	240/56 -45°
GLD	used from 948 nm out; 67 nm from the line		260/37	260/25 14°	250/27 8°	230/36 -8°	230/49 -21°	250/71 -30°	260/82 -36°	250/73 -48°
SLN	used from 1098 nm out; 75 nm from the line	230/49	240/41 22°	230/26 15°	220/21 7°	240/38 -8°	240/44 -21°	260/77 -29°	270/70 -36°	270/63 -48°
ICT	used from 1197 nm out; 31 nm from the line	230/45	240/33 21°	230/23 14°	230/22 7°	240/29 -7°	240/36 -20°	260/78 -29°	270/69 -36°	270/56 -49°
TUL	used from 1297 nm out; 60 nm from the line	230/42	250/23 17°	220/16 14°	240/10 8°	240/20 -6°	260/28 -17°	270/61 -29°	280/52 -38°	290/46 -50°
FSM	used from 1397 nm out; 53 nm from the line	230/33	260/23 15°	240/23 11°	230/18 8°	230/20 -8°	250/31 -17°	280/51 -30°	280/52 -39°	300/47 -51°
LIT	used from 1497 nm out; 29 nm from the line	250/22	250/25 18°	240/23 12°	240/20 7°	250/17 -6°	260/25 -17°	300/45 -29°	300/49 -40°	310/43 -51°
MEM	used from 1597 nm out; 72 nm from the line	250/19	260/19 17°	270/20 12°	270/16 6°	270/21 -6°	290/27 -17°	300/37 -30°	300/49 -40°	310/40 -51°
JAN	used from 1647 nm out; 77 nm from the line	240/10	260/15 18°	280/10 11°	290/6 6°	290/15 -5°	300/15 -17°	320/35 -30°	330/38 -40°	330/39 -51°
MGM	used from 1796 nm out; 78 nm from the line	320/19	330/16 17°	340/21 11°	330/11 5°	330/27 -6°	330/21 -17°	330/37 -32°	340/44 -40°	360/30 -52°
TLH	used from 1946 nm out; 70 nm from the line	340/23	350/26 17°	350/21 11°	300/13 6°	320/25 -6°	340/35 -16°	350/44 -32°	360/51 -42°	350/33 -52°
PIE	used from 2096 nm out; 65 nm from the line	360/10	340/12 18°	330/9 13°	290/12 8°	260/21 -7°	280/18 -18°	250/20 -33°	250/26 -41°	250/20 -51°

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
BFI Seattle, WA	departure	VFR	from the southeast (140°) at 4 knots	10+ mi	none	21 ft	4:53 am PDT (11:53 UTC)
MWH Moses Lake, WA	120 nm out, 22 nm northeast of the line, tower	VFR	from the north-northwest (330°) at 5 knots	10+ mi	none	1,188 ft	11:52 UTC
LWS Lewiston, ID	230 nm out, 10 nm north of the line, tower	VFR Sky: scattered clouds at 7,000 feet, overcast at 9,500 feet	from the east-northeast (060°) at 5 knots	10+ mi	9,500 ft	1,442 ft	11:56 UTC
DUB Dubois, WY	579 nm out, 14 nm south of the line	low IFR Sky: a broken layer at 200 feet, overcast at 4,700 feet Weather: mist	from the southeast (140°) at 8 knots	0.75 mi	200 ft	7,298 ft	12:15 UTC
CPR Casper, WY	718 nm out, 20 nm northeast of the line, tower	VFR Sky: overcast at 5,500 feet	from the west-southwest (240°) at 9 knots	10+ mi	5,500 ft	5,344 ft	11:53 UTC
OIN Oberlin, KS	1048 nm out, 2 nm north of the line	VFR	from the south-southwest (200°) at 16 knots, gusting to 23	10+ mi	none	2,706 ft	11:55 UTC
BEC Wichita, KS	1247 nm out, 16 nm southwest of the line, tower	VFR	from the south (190°) at 12 knots, gusting to 18	10+ mi	none	1,408 ft	11:55 UTC
XNA Fayetteville/Springdale/Rogers, AR	1407 nm out, 4 nm southeast of the line, tower	VFR	from the south (190°) at 4 knots	10+ mi	none	1,288 ft	11:53 UTC
GWO Greenwood, MS	1676 nm out, 3 nm southwest of the line, tower	VFR	calm	10+ mi	none	162 ft	11:53 UTC
ECP Panama City, FL	1966 nm out, 3 nm southwest of the line, tower	VFR	from the northwest (320°) at 3 knots	10+ mi	none	68 ft	11:53 UTC
AAF Apalachicola, FL	2026 nm out, 6 nm west of the line	VFR	calm	10+ mi	none	19 ft	11:53 UTC
PIE St Petersburg-Clearwater, FL	destination	VFR	from the north (010°) at 4 knots	10+ mi	none	10 ft	7:53 am EDT (11:53 UTC)

The highest airport on this list sits at 7,298 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At PIE when you get there the forecast at the estimated arrival, 11:01 pm EDT (03:01 UTC)

Wind from the north at 8 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for PIE

From Mon 8:00 am EDT (12:00 UTC): wind from the north at 8 knots, visibility more than 6 miles, clear skies
From Tue 12:00 am EDT (04:00 UTC): wind from the north-northeast at 6 knots, visibility more than 6 miles, clear skies

The forecast for BFI, the departure

From Mon 5:00 am PDT (12:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
From Mon 12:00 pm PDT (19:00 UTC): wind from the west-southwest at 4 knots, visibility more than 6 miles, clear skies
From Mon 2:00 pm PDT (21:00 UTC): wind from the west-northwest at 5 knots, visibility more than 6 miles, clear skies
From Mon 8:00 pm PDT (03:00 UTC): wind calm, visibility more than 6 miles, scattered clouds at 25,000 feet
From Tue 4:00 am PDT (11:00 UTC): wind from the south-southeast at 4 knots, visibility more than 6 miles, overcast at 10,000 feet

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

No temporary flight restriction on or near this route right now.

Daylight

Sunset at BFI 6:25 pm PDT (01:25 UTC), at PIE 7:04 pm EDT (23:04 UTC) (civil twilight ends 7:28 pm EDT (23:28 UTC)). At 120 knots the arrival at PIE is after sunset there (7:04 pm EDT (23:04 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 Pacific Northwest · loop National Weather Service

Radar now, the northern Rockies · loop National Weather Service

Radar now, the southern Plains · 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: Boeing Fld/King County International, St. Pete-Clearwater International.