How far is Idaho Falls, ID from Post Falls, ID?
The driving distance from Idaho Falls, ID to Post Falls, ID is about 490.8 miles (789.9 km), with a travel time of about 07h 27m by car.
- The straight-line flight distance is about 377.7 miles (607.9 km).
- For a round trip, plan for roughly 14h 55m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 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 07h 27m.
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.
Light Rain Likely then Showers And Thunderstorms
Rain
Driving Route Map
The map below follows the saved road route between Idaho Falls and Post Falls.
Turn-by-Turn Driving Directions
Step-by-step road directions between Idaho Falls and Post Falls.
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1
Start on Charleston Lane
46 m · 9 sec · Charleston Lane
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2
Turn right onto West Stone Run Lane
74 m · 16 sec · West Stone Run Lane
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3
Turn left onto Stonebrook Lane
142 m · 15 sec · Stonebrook Lane
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4
Continue on South Boulevard
1.6 km · 3 min · South Boulevard
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5
Turn left onto East 17th Street
3012 ft · 53 sec · East 17th Street
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6
Continue on Pancheri Drive
1964 ft · 47 sec · Pancheri Drive
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7
Turn right onto South Utah Avenue
776 ft · 16 sec · South Utah Avenue
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8
Enter the roundabout and take exit 2 toward South Utah Avenue
68 m · 4 sec · South Utah Avenue
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9
Exit the roundabout onto South Utah Avenue
2440 ft · 58 sec · South Utah Avenue
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10
Turn left onto West Broadway Street
1513 ft · 35 sec · West Broadway Street
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11
Take the ramp right toward I15 North: Roberts, Butte
1128 ft · 28 sec
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12
Merge slight left onto Veterans Memorial Highway
198.2 mi · 3 hr 6 min · Veterans Memorial Highway
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13
Take the exit slight left toward I 90 West: Missoula
2808 ft · 1 min
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14
Merge slight left onto I 90 West: Missoula
285.8 mi · 4 hr 50 min
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15
Take the exit slight right toward Spokane Street
1913 ft · 50 sec
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16
Turn right onto North Spokane Street
1710 ft · 1 min · North Spokane Street
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17
Turn left onto West 10th Avenue
872 ft · 38 sec · West 10th Avenue
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18
Arrive at your destination
0 m · 1 sec · West 10th Avenue
Car Route Details
A richer read on the saved driving route between Idaho Falls and Post Falls.
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 onto I 90 West: Missoula
286 mi · 04h 50m
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.
Light Rain Likely then Showers And Thunderstorms leaving Idaho Falls and Rain near Post Falls.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Idaho Falls to Post Falls?
The road trip is about 490.8 miles (789.9 km) and usually takes 07h 27m 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 244 miles from Idaho Falls and 246.8 miles from Post Falls.
How much longer is the road route than the straight-line distance?
The direct path is about 377.7 miles (607.9 km), while the road route adds roughly 113.1 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 MDT. 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 $67.43 one way or $134.85 round trip. Estimated CO2 is about 153.9 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Idaho Falls and Post Falls, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Light Rain Likely then Showers And Thunderstorms around Idaho Falls and Rain near Post Falls.
Flight Path Map
This map shows the direct air route between Idaho Falls and Post Falls. Straight-line distance: 377.74 mi (607.91 km).
#1 Idaho Falls
The most populous city in Bonneville County, Idaho.
| Population | 62,888 |
| Coordinates | 43.4665800, -112.0341400 |
| Altitude | 1434 |
| Country | United States |
#2 Post Falls
City in Kootenai County, Idaho, United States
| Population | 36,250 |
| Coordinates | 47.7179600, -116.9515900 |
| Altitude | 665 |
| Country | United States |
End: West 10th Avenue (-116.951612, 47.717931)
Estimated Travel Time
Distance: 790 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 16h 21m |
| 40 mph (64.37 km/h) | 12h 16m |
| 50 mph (80.47 km/h) | 09h 48m |
| 60 mph (96.56 km/h) | 08h 10m |
| 70 mph (112.65 km/h) | 07h 00m |
| 80 mph (129 km/h) | 06h 07m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $67.43 | $134.85 |
| Mid-grade | $4.23 | $73.28 | $146.56 |
| Premium | $4.55 | $78.79 | $157.58 |
| Diesel | $5.41 | $93.74 | $187.47 |
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 22, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.