How far is Lame Deer, MT from Helena, MT?
The driving distance from Lame Deer, MT to Helena, MT is about 336 miles (540.8 km), with a travel time of about 05h 20m by car.
- The straight-line flight distance is about 265.8 miles (427.7 km).
- For a round trip, plan for roughly 10h 41m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM MDT.
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 05h 20m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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.
City in and county seat of Sweet Grass County, Montana, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Snow Showers
Slight Chance Snow Showers
Driving Route Map
The map below follows the saved road route between Lame Deer and Helena.
Turn-by-Turn Driving Directions
Step-by-step road directions between Lame Deer and Helena.
-
1
Start on the route
117 m · 6 sec
-
2
Exit the roundabout onto US Highway 212
41.8 mi · 49 min · US Highway 212
-
3
Take the exit slight right
131 m · 11 sec
-
4
Continue straight
83.8 mi · 1 hr 25 min
-
5
Continue straight
151.6 mi · 2 hr 28 min
-
6
Take the exit slight right toward US 287: Helena, Ennis
1498 ft · 37 sec
-
7
Turn right onto Highway 287
63.5 mi · 1 hr 14 min · Highway 287
-
8
Turn left onto North Montana Avenue
146 m · 18 sec · North Montana Avenue
-
9
Turn right onto 11th Avenue
1.3 km · 2 min · 11th Avenue
-
10
Turn right onto Cruse Avenue
50 m · 6 sec · Cruse Avenue
-
11
Arrive at your destination
0 m · 1 sec · Cruse Avenue
Car Route Details
A richer read on the saved driving route between Lame Deer and Helena.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
US Highway 212
Continue straight
152 mi · 02h 28m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Chance Snow Showers leaving Lame Deer and Slight Chance Snow Showers near Helena.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Lame Deer to Helena?
The road trip is about 336 miles (540.8 km) and usually takes 05h 20m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Big Timber is a useful midpoint, sitting about 170.7 miles from Lame Deer and 165.3 miles from Helena.
How much longer is the road route than the straight-line distance?
The direct path is about 265.8 miles (427.7 km), while the road route adds roughly 70.2 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 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 6:18 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $46.17 one way or $92.34 round trip. Estimated CO2 is about 105.4 kg one way.
What should you check before leaving?
Before you leave, expect Chance Snow Showers around Lame Deer and Slight Chance Snow Showers near Helena.
Stop Ideas Near Big Timber
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Big Timber.
Livingston, MT
Bozeman, MT
Billings, MT
Flight Path Map
This map shows the direct air route between Lame Deer and Helena. Straight-line distance: 265.73 mi (427.65 km).
#1 Lame Deer
Center for the Northern Cheyenne Nation
| Population | 2,052 |
| Coordinates | 45.6230500, -106.6667000 |
| Altitude | 1014 |
| Country | United States |
#2 Helena
State capital of Montana, United States and seat of Lewis and Clark County
| Population | 33,737 |
| Coordinates | 46.5927100, -112.0361100 |
| Altitude | 1237 |
| Country | United States |
End: Cruse Avenue (-112.036062, 46.592722)
Estimated Travel Time
Distance: 541 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 11h 11m |
| 40 mph (64.37 km/h) | 08h 24m |
| 50 mph (80.47 km/h) | 06h 43m |
| 60 mph (96.56 km/h) | 05h 36m |
| 70 mph (112.65 km/h) | 04h 48m |
| 80 mph (129 km/h) | 04h 11m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $46.17 | $92.34 |
| Mid-grade | $4.23 | $50.18 | $100.36 |
| Premium | $4.55 | $53.95 | $107.90 |
| Diesel | $5.41 | $64.19 | $128.37 |
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 Montana · May 05, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.