Seattle-Tacoma International to Duluth International SEA → DLH
1,223 nautical miles (1,407 statute miles) east on a straight line, true course 081°, about 065° magnetic at the departure end (variation 16E). At 120 knots that is 7 h 04 min at the quickest height in today's winds (39,000 ft, a 53-knot tailwind), arriving about 3:06 am CDT (08:06 UTC), after sunset at the destination. 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 ZULU 2C: moderate icing up to 14,000 ft. Over the route from 129 to 358 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 219 to 517 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 278 to 765 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 348 to 746 nm out.
- AIRMET ZULU 4C: moderate icing up to 20,000 ft. Over the route from 855 to 1113 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 964 to 1103 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 SEA.
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 20:00–03:00 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 11 forecast points nearest it (SEA, YKM, GEG, GPI, GTF, GGW, DIK, MOT, GFK, AXN, DLH). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 5,500 ft | 070° at 10 kt | +10 kt | 1 °C | 110 kt | 11 h 07 min | 7:09 am CDT (12:09 UTC) |
| 7,500 ft | 090° at 6 kt | +7 kt | 2 °C | 113 kt | 10 h 49 min | 6:51 am CDT (11:51 UTC) |
| 9,500 ft | 160° at 4 kt | +2 kt | -1 °C | 118 kt | 10 h 22 min | 6:24 am CDT (11:24 UTC) |
| 11,500 ft | 210° at 8 kt | −3 kt | -3 °C | 123 kt | 9 h 57 min | 5:59 am CDT (10:59 UTC) |
| 13,500 ft | 220° at 12 kt | −7 kt | -7 °C | 127 kt | 9 h 38 min | 5:40 am CDT (10:40 UTC) |
| 15,500 ft | 220° at 17 kt | −10 kt | -10 °C | 130 kt | 9 h 24 min | 5:26 am CDT (10:26 UTC) |
| 17,500 ft | 220° at 22 kt | −14 kt | -14 °C | 134 kt | 9 h 08 min | 5:10 am CDT (10:10 UTC) |
| 18,000 ft FL180 | 220° at 23 kt | −15 kt | -15 °C | 135 kt | 9 h 04 min | 5:06 am CDT (10:06 UTC) |
| 24,000 ft FL240 | 240° at 34 kt | −28 kt | -24 °C | 148 kt | 8 h 16 min | 4:18 am CDT (09:18 UTC) |
| 30,000 ft FL300 | 240° at 49 kt | −42 kt | -37 °C | 162 kt | 7 h 33 min | 3:35 am CDT (08:35 UTC) |
| 34,000 ft FL340 | 250° at 53 kt | −48 kt | -44 °C | 168 kt | 7 h 17 min | 3:19 am CDT (08:19 UTC) |
| 39,000 ft FL390 | 250° at 57 kt | −53 kt | -48 °C | 173 kt | 7 h 04 min | 3:06 am CDT (08:06 UTC) |
Based on data from the 11th at 18:00 UTC; valid on the 12th at 00:00 UTC for use 20:00 to 03:00 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 | 360/9 | 350/10 1° | 010/10 -5° | 030/20 -11° | 020/60 -17° | 010/86 -26° | 360/90 -40° | 010/68 -42° | 360/31 -43° |
| YKM | used from 50 nm out; 64 nm from the line | 030/16 | 020/18 0° | 030/30 -8° | 030/23 -13° | 020/40 -23° | 010/73 -29° | 010/54 -36° | 360/29 -37° | 330/16 -40° |
| GEG | used from 99 nm out; 71 nm from the line | 050/18 -2° | 060/19 -8° | L/V -11° | 160/11 -24° | 190/17 -31° | 200/19 -35° | 220/14 -37° | 250/11 -41° | |
| GPI | used from 249 nm out; 57 nm from the line | 060/19 -3° | 110/11 -8° | 130/6 -8° | 200/40 -19° | 190/58 -28° | 200/101 -39° | 220/73 -43° | 230/41 -43° | |
| GTF | used from 398 nm out; 45 nm from the line | 070/21 | 080/18 -6° | 120/5 -5° | 180/30 -14° | 200/53 -24° | 210/80 -38° | 220/83 -44° | 230/68 -46° | |
| GGW | used from 547 nm out; 62 nm from the line | 090/18 0° | 140/12 -2° | 150/13 -3° | 200/35 -12° | 230/56 -22° | 240/75 -37° | 240/81 -46° | 240/78 -49° | |
| DIK | used from 746 nm out; 73 nm from the line | 110/15 6° | 200/17 5° | 230/31 1° | 240/47 -10° | 240/52 -20° | 230/52 -36° | 240/57 -45° | 250/67 -51° | |
| MOT | used from 795 nm out; 35 nm from the line | 070/8 6° | 180/7 2° | 220/18 -1° | 240/37 -11° | 250/55 -20° | 250/64 -36° | 250/70 -46° | 250/80 -54° | |
| GFK | used from 944 nm out; 50 nm from the line | 050/18 | L/V 10° | 240/20 7° | 240/36 1° | 250/47 -11° | 260/53 -21° | 270/59 -36° | 270/65 -47° | 260/88 -56° |
| AXN | used from 1093 nm out; 85 nm from the line | L/V | 220/23 17° | 230/24 12° | 240/25 5° | 260/32 -11° | 260/40 -21° | 270/50 -35° | 270/57 -45° | 270/81 -55° |
| DLH | used from 1143 nm out; 55 nm from the line | 240/6 | 230/22 15° | 250/28 11° | 230/22 4° | 270/33 -12° | 280/47 -21° | 280/59 -37° | 290/65 -47° | 290/88 -55° |
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 | no report just now | 432 ft | ||||
| EAT Wenatchee, WA | 80 nm out, 17 nm southeast of the line | no report just now | 1,248 ft | ||||
| SFF Spokane, WA | 199 nm out, 13 nm south of the line, tower | no report just now | 1,956 ft | ||||
| GPI Kalispell, MT | 328 nm out, 14 nm north of the line, tower | no report just now | 2,976 ft | ||||
| CII Choteau, MT | 408 nm out, 19 nm south of the line | no report just now | 3,946 ft | ||||
| HVR Havre, MT | 507 nm out, 23 nm north of the line | no report just now | 2,591 ft | ||||
| OLF Wolf Point, MT | 676 nm out, 1 nm west of the line | no report just now | 1,988 ft | ||||
| MOT Minot, ND | 845 nm out, 23 nm north of the line, tower | no report just now | 1,715 ft | ||||
| FSE Fosston, MN | 1074 nm out, 15 nm north of the line | no report just now | 1,278 ft | ||||
| XVG Longville, MN | 1143 nm out, 9 nm southwest of the line | no report just now | 1,336 ft | ||||
| DLH Duluth, MN | destination | no report just now | 1,427 ft |
The highest airport on this list sits at 3,946 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At DLH when you get there the forecast at the estimated arrival, 3:06 am CDT (08:06 UTC)
DLH has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/4348 GRAND FORKS AFB, ND, Sunday, March 8, 2026 through Sunday, November 1, 2026 Local 15 nm from the route, 1004 nm along the route · security · until 1 November · ZMP
Daylight
Sunset at SEA 6:27 pm PDT (01:27 UTC), at DLH 6:27 pm CDT (23:27 UTC) (civil twilight ends 6:58 pm CDT (23:58 UTC)). At 120 knots the arrival at DLH is before sunrise there (7:22 am CDT (12:22 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: Seattle-Tacoma International, Duluth International.