How far is Saint Maries, ID from Idaho Falls, ID?
The driving distance from Saint Maries, ID to Idaho Falls, ID is about 493.5 miles (794.2 km), with a travel time of about 07h 42m by car.
- The straight-line flight distance is about 344.8 miles (554.9 km).
- For a round trip, plan for roughly 15h 24m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 AM PDT.
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 07h 42m.
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.
City in Lemhi County, Idaho, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Light Rain
Slight Chance Snow Showers
Driving Route Map
The map below follows the saved road route between Saint Maries and Idaho Falls.
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Maries and Idaho Falls.
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1
Start on West Jefferson Avenue
15 m · 8 sec · West Jefferson Avenue
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2
Turn left onto South 3rd Street
882 ft · 27 sec · South 3rd Street
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3
Continue on Highway 3 North
10.7 mi · 16 min · Highway 3 North
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4
Continue on South Highway 3
21.8 mi · 32 min · South Highway 3
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5
Take the ramp right
1146 ft · 28 sec
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6
Merge slight left
256.2 mi · 4 hr 14 min
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7
Take the exit slight right toward I 15 South: Dillon, Idaho Falls
2694 ft · 1 min
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8
Merge slight left
198 mi · 3 hr 6 min
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9
Take the exit slight right toward I 15 Business, US 20 West: Historic Downtown, Arco
1619 ft · 47 sec
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10
Continue on West Broadway Street
2164 ft · 54 sec · West Broadway Street
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11
Turn right onto South Utah Avenue
2435 ft · 50 sec · South Utah Avenue
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12
Enter the roundabout and take exit 1 toward South Utah Avenue
31 m · 2 sec · South Utah Avenue
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13
Exit the roundabout onto South Utah Avenue
781 ft · 23 sec · South Utah Avenue
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14
Turn left onto Pancheri Drive
1930 ft · 43 sec · Pancheri Drive
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15
Continue on West 17th Street
3067 ft · 58 sec · West 17th Street
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16
Turn right onto South Boulevard
1.6 km · 3 min · South Boulevard
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17
Continue on Stonebrook Lane
142 m · 15 sec · Stonebrook Lane
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18
Turn right onto West Stone Run Lane
74 m · 16 sec · West Stone Run Lane
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19
Turn left onto Charleston Lane
46 m · 7 sec · Charleston Lane
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20
Arrive at your destination
0 m · 1 sec · Charleston Lane
Car Route Details
A richer read on the saved driving route between Saint Maries and Idaho Falls.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
South Highway 3
Merge slight left
256 mi · 04h 14m
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.
Slight Chance Light Rain leaving Saint Maries and Slight Chance Snow Showers near Idaho Falls.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Saint Maries to Idaho Falls?
The road trip is about 493.5 miles (794.2 km) and usually takes 07h 42m 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?
Salmon is a useful midpoint, sitting about 245.3 miles from Saint Maries and 248.2 miles from Idaho Falls.
How much longer is the road route than the straight-line distance?
The direct path is about 344.8 miles (554.9 km), while the road route adds roughly 148.7 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 PDT. 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 $67.78 one way or $135.55 round trip. Estimated CO2 is about 154.7 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Saint Maries and Idaho Falls, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Slight Chance Light Rain around Saint Maries and Slight Chance Snow Showers near Idaho Falls.
Flight Path Map
This map shows the direct air route between Saint Maries and Idaho Falls. Straight-line distance: 344.78 mi (554.87 km).
#1 Saint Maries
River in the United States of America
| Population | 2,448 |
| Coordinates | 47.3143500, -116.5626700 |
| Altitude | 668 |
| Country | United States |
#2 Idaho Falls
The most populous city in Bonneville County, Idaho.
| Population | 62,888 |
| Coordinates | 43.4665800, -112.0341400 |
| Altitude | 1434 |
| Country | United States |
End: Charleston Lane (-112.034479, 43.46658)
Estimated Travel Time
Distance: 794 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 16h 26m |
| 40 mph (64.37 km/h) | 12h 20m |
| 50 mph (80.47 km/h) | 09h 52m |
| 60 mph (96.56 km/h) | 08h 13m |
| 70 mph (112.65 km/h) | 07h 02m |
| 80 mph (129 km/h) | 06h 09m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $67.78 | $135.55 |
| Mid-grade | $4.23 | $73.66 | $147.32 |
| Premium | $4.55 | $79.20 | $158.40 |
| Diesel | $5.41 | $94.22 | $188.45 |
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 Idaho · Apr 18, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.