How far is Twin Falls, ID from Post Falls, ID?
The driving distance from Twin Falls, ID to Post Falls, ID is about 543.8 miles (875.2 km), with a travel time of about 09h 12m by car.
- The straight-line flight distance is about 376.2 miles (605.5 km).
- For a round trip, plan for roughly 18h 24m 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 09h 12m.
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 Washington County, Idaho, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Rain Showers
Rain
Driving Route Map
The map below follows the saved road route between Twin Falls and Post Falls.
Turn-by-Turn Driving Directions
Step-by-step road directions between Twin Falls and Post Falls.
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1
Start on Shoshone Street East
25 m · 4 sec · Shoshone Street East
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2
Turn right onto 11th Avenue East
69 m · 17 sec · 11th Avenue East
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3
Turn sharp right onto Addison Avenue
106 m · 18 sec · Addison Avenue
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4
Turn left onto Blue Lakes Boulevard North
2 mi · 4 min · Blue Lakes Boulevard North
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5
Continue on North 3000 East Road
3.7 mi · 5 min · North 3000 East Road
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6
Take the exit straight toward I 84 West
1.2 km · 2 min
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7
Merge slight left onto Vietnam Veterans Memorial Highway
361.3 mi · 6 hr 12 min · Vietnam Veterans Memorial Highway
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8
Take the exit slight right toward US 395 North: Stanfield, Hermiston
1706 ft · 42 sec
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9
Continue on Umatilla-Stanfield Highway
1.2 mi · 1 min · Umatilla-Stanfield Highway
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10
Continue on South Main Street
2 mi · 2 min · South Main Street
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11
Continue on Umatilla-Stanfield Highway
3.2 mi · 4 min · Umatilla-Stanfield Highway
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12
Turn right onto Southeast 4th Street
1.6 mi · 3 min · Southeast 4th Street
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13
Turn left onto East Theater Lane
1368 ft · 42 sec · East Theater Lane
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14
Turn right onto North 1st Street
2864 ft · 39 sec · North 1st Street
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15
Continue on Umatilla-Stanfield Highway
3.8 mi · 4 min · Umatilla-Stanfield Highway
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16
Turn left onto Columbia River Highway
1.1 km · 49 sec · Columbia River Highway
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17
Take the exit right toward I 82 West, US 395 North: Kennewick, Yakima
1130 ft · 28 sec
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18
Merge slight left onto McNary Highway
20.4 mi · 22 min · McNary Highway
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19
Keep slight right to continue on Lewis and Clark Trail Highway
3.3 mi · 5 min · Lewis and Clark Trail Highway
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20
Continue on South US 395
1.1 mi · 2 min · South US 395
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21
Continue on Lewis and Clark Trail
4.9 mi · 7 min · Lewis and Clark Trail
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22
Take the exit slight right toward US 395 north, SR 397 south (Oregon Street): Spokane, Finley
859 ft · 21 sec
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23
Keep slight left to continue on US 395
1416 ft · 35 sec
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24
Keep slight right to continue on US 395 North: Spokane
130.7 mi · 2 hr 21 min
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25
Merge slight right
25.9 mi · 30 min
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26
Take the exit slight right toward I 90 Business
1895 ft · 48 sec
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27
Turn left onto North Spokane Street
2151 ft · 1 min · North Spokane Street
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28
Turn left onto West 10th Avenue
872 ft · 38 sec · West 10th Avenue
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29
Arrive at your destination
0 m · 1 sec · West 10th Avenue
Car Route Details
A richer read on the saved driving route between Twin 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.
Vietnam Veterans Memorial Highway
Merge slight left onto Vietnam Veterans Memorial Highway
361 mi · 06h 12m
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.
Rain Showers leaving Twin 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 Twin Falls to Post Falls?
The road trip is about 543.8 miles (875.2 km) and usually takes 09h 12m 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?
Midvale is a useful midpoint, sitting about 284.5 miles from Twin Falls and 259.4 miles from Post Falls.
How much longer is the road route than the straight-line distance?
The direct path is about 376.2 miles (605.5 km), while the road route adds roughly 167.6 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 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 $74.71 one way or $149.41 round trip. Estimated CO2 is about 170.5 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Twin 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 Rain Showers around Twin Falls and Rain near Post Falls.
Stop Ideas Near Midvale
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 Midvale.
Ontario
Vale, Oregon
McCall, Idaho
Baker City, Oregon
Flight Path Map
This map shows the direct air route between Twin Falls and Post Falls. Straight-line distance: 376.24 mi (605.5 km).
#1 Twin Falls
The most populous city in Twin Falls County, Idaho.
| Population | 50,197 |
| Coordinates | 42.5629700, -114.4608700 |
| Altitude | 1138 |
| 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: 875 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 18h 07m |
| 40 mph (64.37 km/h) | 13h 35m |
| 50 mph (80.47 km/h) | 10h 52m |
| 60 mph (96.56 km/h) | 09h 03m |
| 70 mph (112.65 km/h) | 07h 46m |
| 80 mph (129 km/h) | 06h 47m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $74.71 | $149.41 |
| Mid-grade | $4.23 | $81.19 | $162.39 |
| Premium | $4.55 | $87.30 | $174.59 |
| Diesel | $5.41 | $103.86 | $207.71 |
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.