Seattle-Tacoma International to Nashville International SEA → BNA
1,715 nautical miles (1,974 statute miles) east on a straight line, true course 100°, about 084° magnetic at the departure end (variation 16E). At 120 knots that is 10 h 55 min at the quickest height in today's winds (39,000 ft, a 37-knot tailwind), arriving about 9:27 am CDT (14:27 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: 2,932 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 first 150 nm of the route.
- AIRMET ZULU 2C: moderate icing up to 20,000 ft. Over the route from 60 to 499 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 219 to 668 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 249 to 449 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 359 to 708 nm out.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 489 to 748 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 509 to 648 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 618 to 718 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 618 to 888 nm out.
- AIRMET TANGO 3W: 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 1087 to 1306 nm out.
- AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Near the route, at the destination end.
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 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 15 forecast points nearest it (SEA, YKM, GEG, LWS, DLN, BIL, RAP, ONL, GRI, OMA, MKC, COU, STL, CGI, BNA). 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 | 230° at 15 kt | −5 kt | 125 kt | 13 h 43 min | 12:15 pm CDT (17:15 UTC) | |
| 5,500 ft | 220° at 10 kt | −1 kt | 14 °C | 121 kt | 14 h 10 min | 12:42 pm CDT (17:42 UTC) |
| 7,500 ft | 230° at 9 kt | −2 kt | 8 °C | 122 kt | 14 h 03 min | 12:35 pm CDT (17:35 UTC) |
| 9,500 ft | 230° at 10 kt | −4 kt | 4 °C | 124 kt | 13 h 50 min | 12:22 pm CDT (17:22 UTC) |
| 11,500 ft | 230° at 12 kt | −5 kt | 2 °C | 125 kt | 13 h 43 min | 12:15 pm CDT (17:15 UTC) |
| 13,500 ft | 230° at 15 kt | −7 kt | -2 °C | 127 kt | 13 h 30 min | 12:02 pm CDT (17:02 UTC) |
| 15,500 ft | 230° at 16 kt | −8 kt | -6 °C | 128 kt | 13 h 24 min | 11:56 am CDT (16:56 UTC) |
| 17,500 ft | 240° at 18 kt | −10 kt | -10 °C | 130 kt | 13 h 12 min | 11:44 am CDT (16:44 UTC) |
| 18,000 ft FL180 | 240° at 19 kt | −10 kt | -11 °C | 130 kt | 13 h 12 min | 11:44 am CDT (16:44 UTC) |
| 24,000 ft FL240 | 240° at 22 kt | −11 kt | -22 °C | 131 kt | 13 h 05 min | 11:37 am CDT (16:37 UTC) |
| 30,000 ft FL300 | 250° at 30 kt | −21 kt | -34 °C | 141 kt | 12 h 10 min | 10:42 am CDT (15:42 UTC) |
| 34,000 ft FL340 | 260° at 41 kt | −34 kt | -39 °C | 154 kt | 11 h 08 min | 9:40 am CDT (14:40 UTC) |
| 39,000 ft FL390 | 260° at 43 kt | −37 kt | -46 °C | 157 kt | 10 h 55 min | 9:27 am CDT (14:27 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SEA | used from 0 nm out; 25 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° |
| YKM | used from 50 nm out; 39 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° |
| GEG | used from 150 nm out; 52 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° | |
| LWS | used from 199 nm out; 17 nm from the line | 070/10 | 080/12 -2° | 030/12 -6° | 080/7 -10° | 170/34 -21° | 160/46 -32° | 200/33 -35° | 220/22 -35° | 230/18 -38° |
| DLN | used from 349 nm out; 59 nm from the line | 090/6 -6° | 240/22 -4° | 210/34 -16° | 210/62 -25° | 210/66 -34° | 210/82 -36° | 220/77 -42° | ||
| BIL | used from 499 nm out; 73 nm from the line | 080/13 | 180/9 -2° | 210/38 0° | 220/51 -11° | 210/46 -22° | 210/58 -35° | 230/73 -39° | 230/72 -45° | |
| RAP | used from 698 nm out; 115 nm from the line | 180/23 12° | 200/38 13° | 210/38 6° | 220/28 -10° | 230/34 -21° | 230/37 -36° | 250/52 -38° | 250/59 -46° | |
| ONL | used from 947 nm out; 81 nm from the line | 210/31 20° | 230/27 13° | 230/18 7° | 220/19 -8° | 240/26 -20° | 250/44 -35° | 270/52 -39° | 260/57 -47° | |
| GRI | used from 1047 nm out; 41 nm from the line | 230/35 21° | 230/23 13° | 220/20 7° | 240/25 -8° | 240/37 -20° | 250/49 -33° | 260/57 -38° | 260/58 -47° | |
| OMA | used from 1147 nm out; 40 nm from the line | 220/47 | 240/33 19° | 250/18 11° | 230/17 6° | 260/29 -8° | 250/33 -19° | 250/51 -33° | 260/61 -40° | 270/62 -49° |
| MKC | used from 1247 nm out; 56 nm from the line | 220/44 | 250/28 18° | 250/18 13° | 240/12 6° | 280/24 -6° | 240/34 -18° | 260/47 -30° | 260/51 -40° | 270/58 -50° |
| COU | used from 1346 nm out; 35 nm from the line | 230/31 | 230/30 15° | 260/16 11° | 270/14 6° | 260/24 -6° | 270/27 -18° | 270/37 -32° | 280/49 -41° | 290/56 -51° |
| STL | used from 1446 nm out; 36 nm from the line | 250/24 | 250/24 16° | 260/23 9° | 270/16 6° | 260/25 -6° | 270/29 -19° | 290/34 -33° | 290/48 -41° | 290/54 -51° |
| CGI | used from 1496 nm out; 47 nm from the line | 240/20 | 270/15 15° | 280/15 11° | 300/13 6° | 290/20 -6° | 280/24 -18° | 300/34 -32° | 300/47 -41° | 310/49 -51° |
| BNA | used from 1645 nm out; 45 nm from the line | 310/20 | 340/20 17° | 330/24 10° | 340/22 5° | 330/26 -6° | 340/29 -18° | 330/52 -33° | 320/62 -41° | 340/45 -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 |
|---|---|---|---|---|---|---|---|
| SEA Seattle, WA | departure | no report just now | 432 ft | ||||
| MWH Moses Lake, WA | 120 nm out, 10 nm northeast of the line, tower | no report just now | 1,188 ft | ||||
| LWS Lewiston, ID | 229 nm out, 18 nm southwest of the line, tower | no report just now | 1,442 ft | ||||
| BZN Bozeman, MT | 469 nm out, 17 nm northeast of the line, tower | no report just now | 4,473 ft | ||||
| BYG Buffalo, WY | 678 nm out, 3 nm northwest of the line | no report just now | 4,970 ft | ||||
| HSR Hot Springs, SD | 828 nm out, 4 nm east of the line | no report just now | 3,150 ft | ||||
| IEN Pine Ridge, SD | 878 nm out, 3 nm southwest of the line | no report just now | 3,332 ft | ||||
| LNK Lincoln, NE | 1167 nm out, 6 nm southwest of the line, tower | no report just now | 1,218 ft | ||||
| STJ St Joseph, MO | 1266 nm out, 21 nm southwest of the line, tower | no report just now | 826 ft | ||||
| COU Columbia, MO | 1406 nm out, 7 nm southwest of the line, tower | no report just now | 889 ft | ||||
| PAH Paducah, KY | 1596 nm out, 11 nm south of the line, tower | no report just now | 410 ft | ||||
| BNA Nashville, TN | destination | no report just now | 599 ft |
The highest airport on this list sits at 4,970 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At BNA when you get there the forecast at the estimated arrival, 9:27 am CDT (14:27 UTC)
BNA has no terminal forecast; use the nearest airport that does.
Temporary flight restrictions on the line or within 25 nm of it
- 6/7634 CENTRALIA, MO, Monday, October 12, 2026 UTC 10 nm from the route, 1396 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · today · ZKC
- 6/0708 Goodlettsville, TN, Saturday, August 1, 2026 through Sunday, August 1, 2027 UTC 10 nm from the route, at the destination end · security · until 1 August · ZME
Daylight
Sunset at SEA 6:27 pm PDT (01:27 UTC), at BNA 6:15 pm CDT (23:15 UTC) (civil twilight ends 6:40 pm CDT (23:40 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, Nashville International.