How far is Saint Mary, MO from Seeley Lake, MT?
The driving distance from Saint Mary, MO to Seeley Lake, MT is about 1686.8 miles (2714.7 km), with a travel time of about 29h 44m by car.
- The straight-line flight distance is about 1352.2 miles (2176.2 km).
- For a round trip, plan for roughly 59h 28m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 AM CDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 29h 44m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Human settlement in Lyman County, South Dakota, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Widespread Frost
Driving Route Map
The map below follows the saved road route between Saint Mary and Seeley Lake.
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Mary and Seeley Lake.
-
1
Start on 4th Street
31 m · 10 sec · 4th Street
-
2
Turn left onto 2nd Street
2510 ft · 42 sec · 2nd Street
-
3
Continue on 7th Street
8.4 mi · 12 min · 7th Street
-
4
Turn slight left
4.6 mi · 7 min
-
5
Take the ramp right toward I 55 North: Saint Louis
1298 ft · 32 sec
-
6
Merge slight left
44.6 mi · 48 min
-
7
Continue on Rosa Parks Highway
1.3 mi · 2 min · Rosa Parks Highway
-
8
Take the exit slight right toward I 270 West, I 255 East: Kansas City, Chicago
1279 ft · 27 sec
-
9
Keep slight left to continue on I 270 West: Kansas City
118 m · 8 sec
-
10
Continue on I 270 West
1.2 km · 1 min
-
11
Merge slight left
11.5 mi · 14 min
-
12
Take the exit slight right toward I 64, US 40, US 61: Wentzville, Saint Louis
705 ft · 17 sec
-
13
Keep slight left to continue on I 64 West, US 40 West, US 61 North: Wentzville
2009 ft · 49 sec
-
14
Continue on I 64 West, US 40 West, US 61 North: Wentzville
674 ft · 10 sec
-
15
Merge slight left onto Avenue of the Saints
25.4 mi · 31 min · Avenue of the Saints
-
16
Take the exit slight left toward I 70 West, US 40 West: Kansas City
3047 ft · 1 min
-
17
Merge slight left onto Dwight D Eisenhower Highway
80.7 mi · 1 hr 35 min · Dwight D Eisenhower Highway
-
18
Continue on Sheriff Roger I. Wilson Memorial Highway
2 mi · 2 min · Sheriff Roger I. Wilson Memorial Highway
-
19
Continue on Highway Patrol Sgt. Benjamin Booth Memorial Highway
1.6 mi · 2 min · Highway Patrol Sgt. Benjamin Booth Memorial Highway
-
20
Continue on Dwight D. Eisenhower Highway
1.8 mi · 2 min · Dwight D. Eisenhower Highway
-
21
Continue on U.S. Submarine Veterans' Memorial Highway
54.4 mi · 58 min · U.S. Submarine Veterans' Memorial Highway
-
22
Continue on Dwight D. Eisenhower Highway
52.5 mi · 57 min · Dwight D. Eisenhower Highway
-
23
Continue on Truman/Eisenhower Presidential Highway
2.7 mi · 3 min · Truman/Eisenhower Presidential Highway
-
24
Continue on Clifton J. Scott Memorial Highway
1.8 mi · 2 min · Clifton J. Scott Memorial Highway
-
25
Continue on Truman/Eisenhower Presidential Highway
2.9 mi · 3 min · Truman/Eisenhower Presidential Highway
-
26
Continue on George Brett Super Highway
1.4 km · 58 sec · George Brett Super Highway
-
27
Take the exit slight right toward I 435 North, US 24 East: Des Moines
1.1 mi · 2 min
-
28
Merge slight left onto Lamar Hunt Memorial Highway
7.8 mi · 9 min · Lamar Hunt Memorial Highway
-
29
Continue on I435 N
1.3 mi · 1 min · I435 N
-
30
Continue straight
20.9 mi · 22 min
-
31
Keep slight left to continue on I 29 North, US 71 North: Saint Joseph
37.1 mi · 40 min
-
32
Continue straight
121.5 mi · 2 hr 11 min
-
33
Continue on I 29 North: Sioux City
184.6 mi · 3 hr 12 min
-
34
Take the exit slight right toward I 90 West: Rapid City
1236 ft · 30 sec
-
35
Merge slight left
372.9 mi · 5 hr 55 min
-
36
Take the exit slight right toward SD 34 West: Whitewood, Belle Fourche
1463 ft · 38 sec
-
37
Turn right onto SD Highway 34
17.4 mi · 21 min · SD Highway 34
-
38
Turn right onto 5th Avenue
2.3 mi · 5 min · 5th Avenue
-
39
Turn left onto US Highway 212
93.7 mi · 1 hr 46 min · US Highway 212
-
40
Continue on Park Avenue
2986 ft · 1 min · Park Avenue
-
41
Turn left onto Holt Street
43.7 mi · 51 min · Holt Street
-
42
Continue on Main Street
3072 ft · 2 min · Main Street
-
43
Continue on US Highway 212
20.1 mi · 24 min · US Highway 212
-
44
Enter the roundabout and take exit 2 toward US Highway 212
66 m · 4 sec · US Highway 212
-
45
Exit the roundabout onto US Highway 212
41.8 mi · 49 min · US Highway 212
-
46
Take the exit slight right
131 m · 11 sec
-
47
Continue straight
83.8 mi · 1 hr 25 min
-
48
Continue straight
207.3 mi · 3 hr 23 min
-
49
Keep slight left to continue on I 90 West: Missoula
42.6 mi · 40 min
-
50
Take the exit slight right toward US 12 East: Helena, Garrison
1.2 mi · 2 min
-
51
At the end of the road, turn right
12.9 mi · 14 min
-
52
Turn sharp left
32.5 mi · 35 min
-
53
At the end of the road, turn left
23.8 mi · 26 min
-
54
Turn right
14.8 mi · 19 min
-
55
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Saint Mary and Seeley Lake.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
I 90 West
Merge slight left
373 mi · 05h 55m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Sunny leaving Saint Mary and Widespread Frost near Seeley Lake.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Saint Mary to Seeley Lake?
The road trip is about 1686.8 miles (2714.7 km) and usually takes 29h 44m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
Presho is a useful midpoint, sitting about 837.5 miles from Saint Mary and 849.4 miles from Seeley Lake.
How much longer is the road route than the straight-line distance?
The direct path is about 1352.2 miles (2176.2 km), while the road route adds roughly 334.6 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 7:30 AM CDT. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $236.12 one way or $472.23 round trip. Estimated CO2 is about 529 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Saint Mary and Seeley Lake, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Sunny around Saint Mary and Widespread Frost near Seeley Lake.
Flight Path Map
This map shows the direct air route between Saint Mary and Seeley Lake. Straight-line distance: 1352.24 mi (2176.22 km).
#1 Saint Mary
City in Missouri, United States
| Population | 345 |
| Coordinates | 37.8789400, -89.9492800 |
| Altitude | 119 |
| Country | United States |
#2 Seeley Lake
Census designated place in Montana, USA
| Population | 1,659 |
| Coordinates | 47.1793800, -113.4845200 |
| Altitude | 1225 |
| Country | United States |
End: Seeley Lake (-113.48452, 47.17938)
Estimated Travel Time
Distance: 2715 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 56h 12m |
| 40 mph (64.37 km/h) | 42h 10m |
| 50 mph (80.47 km/h) | 33h 44m |
| 60 mph (96.56 km/h) | 28h 06m |
| 70 mph (112.65 km/h) | 24h 05m |
| 80 mph (129 km/h) | 21h 02m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.97 | $236.12 | $472.23 |
| Mid-grade | $4.33 | $257.60 | $515.21 |
| Premium | $4.69 | $279.27 | $558.54 |
| Diesel | $6.00 | $356.82 | $713.64 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Missouri · Oct 17, 2026