Plan a flight · Mon 9:11 am CDT (14:11 UTC)

The Eastern Iowa Airport to Boeing Fld/King County International CID → BFI

1,339 nautical miles (1,541 statute miles) northwest on a straight line, true course 295°, about 293° magnetic at the departure end (variation 2E). At 120 knots that is 11 h 39 min at the quickest height in today's winds (4,500 ft, a 5-knot headwind), arriving about 6:50 pm PDT (01:50 UTC), after sunset at the destination. Right now CID is VFR, wind from the south (190°) at 9 knots; BFI is VFR, wind from the southeast (130°) 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: 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

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 230 to 969 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 690 to 740 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 750 to 1109 nm out.
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 759 to 1159 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 989 to 1289 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 CID.

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

A321 at 32,000 ft, 9 nm northeast, 7:25 am CDT (12:25 UTC): light chop turbulence. At the departure end, 9 nm northeast of the line.
as filed, and in English
```
CID UA /OV CID360010/TM 1225/FL320/TP A321/TB INTMT LGT CHOP CONS LGT CHOP
```
Report
a routine report filed through CID
Where
10 nm north (360°) of CID
Time
12:25 UTC
Height
at 32,000 ft
Aircraft
A321
Turbulence
intermittent light chop continuous light chop
P46T at 31,000 ft, 22 nm northeast, 8:37 am CDT (13:37 UTC): light chop turbulence. At the departure end, 22 nm northeast of the line.
as filed, and in English
```
ALO UA /OV ALO270005/TM 1337/FL310/TP P46T/TB INTMT LGT CHOP
```
Report
a routine report filed through ALO
Where
5 nm west (270°) of ALO
Time
13:37 UTC
Height
at 31,000 ft
Aircraft
P46T
Turbulence
intermittent light chop
B38M at 32,000 ft, 11 nm north, 6:35 am CDT (11:35 UTC): light chop turbulence above 32,000 ft. 90 nm along the route, 11 nm north of the line.
as filed, and in English
```
FOD UA /OV FOD075035/TM 1135/FL320/TP B38M/TB CONS LGT CHOP 320/INTMT LGT CHOP 340
```
Report
a routine report filed through FOD
Where
35 nm east (075°) of FOD
Time
11:35 UTC
Height
at 32,000 ft
Aircraft
B38M
Turbulence
continuous light chop 320/INTMT light chop at 34,000 ft
BE36 at 6,000 ft, 47 nm north, 8:12 am CDT (13:12 UTC): no turbulence. 150 nm along the route, 47 nm north of the line.
as filed, and in English
```
FRM UA /OV FRM/TM 1312/FL060/TP BE36/TB NEG
```
Report
a routine report filed through FRM
Where
over FRM
Time
13:12 UTC
Height
at 6,000 ft
Aircraft
BE36
Turbulence
none
B38M at 32,000 ft, 9 nm southwest, 6:45 am CDT (11:45 UTC): light chop turbulence. 180 nm along the route, 9 nm southwest of the line.
as filed, and in English
```
FOD UA /OV FOD285060/TM 1145/FL320/TP B38M/TB CONS LGT CHOP OCNL MOD CHOP
```
Report
a routine report filed through FOD
Where
60 nm west (285°) of FOD
Time
11:45 UTC
Height
at 32,000 ft
Aircraft
B38M
Turbulence
continuous light chop occasional moderate chop
UAL1095 at 36,000 ft, 9 nm northeast, 8:00 am CDT (13:00 UTC): no turbulence, -41 °C, wind 253° at 52 knots. 250 nm along the route, 9 nm northeast of the line.
as filed, and in English
```
ARP UAL1095 4338N 09646W 1300 F360 MS41 253/052KT TB NONE SK CLEAR IC
```
Report
a routine report filed through ARP
SF50 at 4,000 ft, 1 nm south, 8:47 am CDT (13:47 UTC): no turbulence, no icing. 400 nm along the route, 1 nm south of the line.
as filed, and in English
```
PIR UA /OV PIR/TM 1347/FL040/TP SF50/SK BASE008-TOP040/TB NEG/IC NEG
```
Report
a routine report filed through PIR
Where
over PIR
Time
13:47 UTC
Height
at 4,000 ft
Aircraft
SF50
Sky
BASE008-TOP040
Turbulence
none
Icing
none
C25A at 5,000 ft, 20 nm south, 8:00 am CDT (13:00 UTC): light rime icing, 4 °C, remarks: lt rime in the descent. 769 nm along the route, 20 nm south of the line.
as filed, and in English
```
BIL UA /OV 100006/TM 1300/FL050/TP C25A/TA 4/IC LT RIME/RM LT RIME IN THE DESCENT
```
Report
a routine report filed through BIL
Where
wind from 100° at 6 knots
Time
13:00 UTC
Height
at 5,000 ft
Aircraft
C25A
Temperature
4 °C
Icing
lt rime
Remarks
lt rime in the descent
GLF4 descending, 45 nm south, 8:48 am CDT (13:48 UTC): a routine report with nothing remarked on. 869 nm along the route, 45 nm south of the line.
as filed, and in English
```
BZN UA /OV BZN/TM 1348/FLDURD/TP GLF4/SK 047
```
Report
a routine report filed through BZN
Where
over BZN
Time
13:48 UTC
Height
during the descent
Aircraft
GLF4
Sky
at 4,700 ft
C340 descending, 45 nm south, 7:47 am CDT (12:47 UTC): light icing, remarks: smooth. 869 nm along the route, 45 nm south of the line.
as filed, and in English
```
BZN UA /OV BZN/TM 1247/FLDURD/TP C340/SK 055/IC LGT RM/RM SMOOTH
```
Report
a routine report filed through BZN
Where
over BZN
Time
12:47 UTC
Height
during the descent
Aircraft
C340
Sky
at 5,500 ft
Icing
light remarks
Remarks
smooth
BE9L at 7,500 ft, 9 nm southwest, 7:45 am CDT (12:45 UTC): no turbulence, light rime icing, overcast from 7,500 ft to 9,000 ft, -6 °C, remarks: during the climb. 899 nm along the route, 9 nm southwest of the line.
as filed, and in English
```
HLN UA /OV HLN120010/TM 1245/FL075/TP BE9L/SK OVC075-TOPS090/TA M06/TB NEG/IC LGT RIME/RM DURC
```
Report
a routine report filed through HLN
Where
10 nm southeast (120°) of HLN
Time
12:45 UTC
Height
at 7,500 ft
Aircraft
BE9L
Sky
overcast from 7,500 ft, tops 9,000 ft
Temperature
−6 °C
Turbulence
none
Icing
light rime
Remarks
during the climb
B752 at 41,000 ft, 8 nm north, 7:31 am CDT (12:31 UTC): light to moderate turbulence above 41,000 ft. 909 nm along the route, 8 nm north of the line.
as filed, and in English
```
HLN UA /OV HLN009010/TM 1231/FL410/TP B752/TB CONS LGT OCNL MOD 410/ZLC
```
Report
a routine report filed through HLN
Where
10 nm north (009°) of HLN
Time
12:31 UTC
Height
at 41,000 ft
Aircraft
B752
Turbulence
continuous light occasional moderate 410/ZLC
A320 at 25,000 ft, 23 nm north, 8:25 am CDT (13:25 UTC): light to moderate chop turbulence above 25,000 ft, remarks: zse. 1069 nm along the route, 23 nm north of the line.
as filed, and in English
```
MLP UA /OV MLP/TM 1325/FL250/TP A320/TB CONS LGT OCNL MOD CHOP 250 /RM ZSE
```
Report
a routine report filed through MLP
Where
over MLP
Time
13:25 UTC
Height
at 25,000 ft
Aircraft
A320
Turbulence
continuous light occasional moderate chop at 25,000 ft
Remarks
zse

Winds aloft along the route, and the time en route the forecast for use 14:00–21:00 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 13 forecast points nearest it (DBQ, MCW, FSD, PIR, RAP, MLS, BIL, GTF, GPI, LWS, 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	+5 kt	3 °C	115 kt	11 h 39 min	6:50 pm PDT (01:50 UTC)
6,500 ft	260° at 6 kt	+5 kt	7 °C	115 kt	11 h 39 min	6:50 pm PDT (01:50 UTC)
8,500 ft	250° at 8 kt	+6 kt	5 °C	114 kt	11 h 45 min	6:56 pm PDT (01:56 UTC)
10,500 ft	250° at 11 kt	+8 kt	1 °C	112 kt	11 h 57 min	7:08 pm PDT (02:08 UTC)
12,500 ft	250° at 13 kt	+9 kt	-2 °C	111 kt	12 h 04 min	7:15 pm PDT (02:15 UTC)
14,500 ft	250° at 14 kt	+9 kt	-6 °C	111 kt	12 h 04 min	7:15 pm PDT (02:15 UTC)
16,500 ft	240° at 15 kt	+10 kt	-11 °C	110 kt	12 h 10 min	7:21 pm PDT (02:21 UTC)
18,000 ft FL180	240° at 16 kt	+10 kt	-14 °C	110 kt	12 h 10 min	7:21 pm PDT (02:21 UTC)
24,000 ft FL240	240° at 21 kt	+14 kt	-26 °C	106 kt	12 h 38 min	7:49 pm PDT (02:49 UTC)
30,000 ft FL300	250° at 28 kt	+20 kt	-36 °C	100 kt	13 h 23 min	8:34 pm PDT (03:34 UTC)
34,000 ft FL340	240° at 35 kt	+24 kt	-39 °C	96 kt	13 h 57 min	9:08 pm PDT (04:08 UTC)
39,000 ft FL390	240° at 43 kt	+31 kt	-44 °C	89 kt	15 h 03 min	10:14 pm PDT (05:14 UTC)

Based on data from the 12th at 12:00 UTC; valid on the 12th at 18:00 UTC for use 14:00 to 21:00 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
DBQ	used from 0 nm out; 70 nm from the line	250/26	240/32 19°	250/35 11°	260/37 5°	270/35 -9°	270/40 -21°	270/43 -35°	280/49 -37°	280/58 -46°
MCW	used from 50 nm out; 45 nm from the line	220/19	210/29 20°	230/35 13°	250/35 5°	250/33 -9°	260/44 -21°	260/46 -33°	270/58 -37°	270/59 -46°
FSD	used from 150 nm out; 69 nm from the line	260/9	210/16 18°	220/27 14°	230/28 6°	240/39 -9°	240/48 -22°	260/52 -32°	260/61 -38°	260/60 -46°
PIR	used from 300 nm out; 80 nm from the line		300/15 10°	270/10 10°	220/18 4°	220/36 -11°	230/43 -21°	240/48 -33°	240/51 -37°	240/55 -44°
RAP	used from 450 nm out; 70 nm from the line		310/18 6°	270/15 6°	260/20 2°	240/28 -11°	240/42 -23°	240/47 -35°	230/47 -36°	240/56 -44°
MLS	used from 600 nm out; 60 nm from the line		320/9 -2°	270/14 0°	260/22 -1°	220/30 -14°	210/43 -26°	230/53 -34°	230/54 -38°	230/59 -44°
BIL	used from 700 nm out; 44 nm from the line		L/V	250/11 -1°	240/20 -2°	230/28 -15°	220/28 -28°	220/53 -34°	220/55 -39°	220/63 -44°
GTF	used from 849 nm out; 59 nm from the line		L/V	L/V -4°	230/12 -3°	210/12 -17°	190/23 -29°	200/48 -39°	210/69 -39°	220/66 -42°
GPI	used from 999 nm out; 82 nm from the line		L/V -3°	L/V -4°	L/V -6°	210/19 -17°	220/26 -32°	190/23 -40°	220/25 -39°	220/34 -42°
LWS	used from 1049 nm out; 65 nm from the line	L/V	L/V -2°	030/6 -5°	050/10 -10°	110/19 -21°	150/22 -31°	130/11 -36°	200/6 -37°	220/21 -40°
GEG	used from 1099 nm out; 32 nm from the line		060/10 -2°	050/11 -3°	050/9 -8°	050/27 -19°	040/26 -31°	030/32 -39°	020/19 -41°	L/V -42°
YKM	used from 1199 nm out; 66 nm from the line	L/V	350/9 0°	040/20 -5°	030/23 -8°	020/41 -18°	010/74 -27°	010/73 -40°	020/54 -44°	350/9 -43°
SEA	used from 1299 nm out; 21 nm from the line	L/V	L/V 1°	020/13 -2°	020/27 -4°	010/43 -14°	360/54 -26°	360/63 -40°	010/60 -48°	350/39 -50°

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
CID Cedar Rapids, IA	departure	VFR	from the south (190°) at 9 knots	10+ mi	none	869 ft	8:52 am CDT (13:52 UTC)
ALO Waterloo, IA	40 nm out, 24 nm north of the line, tower	VFR	from the south (170°) at 4 knots	10+ mi	none	873 ft	13:54 UTC
FSD Sioux Falls, SD	240 nm out, 7 nm north of the line, tower	VFR Sky: a few clouds at 10,000 feet, scattered clouds at 25,000 feet	from the northeast (050°) at 4 knots	10+ mi	none	1,430 ft	13:56 UTC
MHE Mitchell, SD	300 nm out, 4 nm southwest of the line	low IFR Sky: overcast at 200 feet Weather: fog	from the north (350°) at 6 knots	0.5 mi	200 ft	1,304 ft	13:53 UTC
BIL Billings, MT	759 nm out, 20 nm southwest of the line, tower	VFR Sky: scattered clouds at 2,100 feet, overcast at 3,700 feet	from the southwest (220°) at 4 knots	10+ mi	3,700 ft	3,662 ft	13:53 UTC
HLN Helena, MT	909 nm out, 5 nm west of the line, tower	marginal VFR Sky: a broken layer at 2,000 feet, overcast at 4,300 feet	from the west (270°) at 6 knots	10+ mi	2,000 ft	3,877 ft	13:53 UTC
MSO Missoula, MT	999 nm out, 3 nm west of the line, tower	VFR Sky: overcast at 6,500 feet	from the north (350°) at 3 knots	10+ mi	6,500 ft	3,205 ft	13:53 UTC
GEG Spokane, WA	1149 nm out, 22 nm north of the line, tower	VFR Sky: scattered clouds at 3,800 feet, a broken layer at 8,000 feet, a broken layer at 11,000 feet	from the east (100°) at 9 knots	10+ mi	8,000 ft	2,385 ft	13:53 UTC
MWH Moses Lake, WA	1219 nm out, 10 nm south of the line, tower	VFR	from the north (010°) at 4 knots	10+ mi	none	1,188 ft	13:52 UTC
BFI Seattle, WA	destination	VFR	from the southeast (130°) at 3 knots	10+ mi	none	21 ft	6:53 am PDT (13:53 UTC)

The highest airport on this list sits at 3,877 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, 6:50 pm PDT (01:50 UTC)

Wind from the west-northwest at 5 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for BFI

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

The forecast for CID, the departure

From Mon 7:00 am CDT (12:00 UTC): wind from the south-southwest at 10 knots, visibility more than 6 miles, low-level wind shear, a broken layer at 20,000 feet
From Mon 9:00 am CDT (14:00 UTC): wind from the south-southwest at 12 knots, gusting to 22, visibility more than 6 miles, scattered clouds at 20,000 feet
From Mon 7:00 pm CDT (00:00 UTC): wind from the south-southwest at 10 knots, visibility more than 6 miles, low-level wind shear, clear skies
From Tue 12:00 am CDT (05:00 UTC): wind from the west-southwest at 10 knots, visibility more than 6 miles, clear skies

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

6/8927 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local on the route, 979 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 on the route, 979 nm along the route · a VIP movement · starts Wednesday 14 October · ZLC

Daylight

Sunset at CID 6:30 pm CDT (23:30 UTC), at BFI 6:25 pm PDT (01:25 UTC) (civil twilight ends 6:56 pm PDT (01:56 UTC)). At 120 knots the arrival at BFI 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

Radar now, the upper Mississippi valley · loop National Weather Service

Radar now, the northern Rockies · loop National Weather Service

Radar now, the Pacific Northwest · 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: The Eastern Iowa Airport, Boeing Fld/King County International.