How far is Ketchum, ID from Post Falls, ID?
The driving distance from Ketchum, ID to Post Falls, ID is about 446.6 miles (718.7 km), with a travel time of about 08h 36m by car.
- The straight-line flight distance is about 305.6 miles (491.8 km).
- For a round trip, plan for roughly 17h 13m 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 08h 36m.
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 Snow then Snow Showers
Rain
Driving Route Map
The map below follows the saved road route between Ketchum and Post Falls.
Turn-by-Turn Driving Directions
Step-by-step road directions between Ketchum and Post Falls.
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1
Start on the route
27 m · 8 sec
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2
Turn right onto East Sun Valley Road
2.3 mi · 6 min · East Sun Valley Road
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3
Continue on Trail Creek Road
36.3 mi · 1 hr 28 min · Trail Creek Road
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4
Turn left onto Old Chilly Road
2.7 mi · 7 min · Old Chilly Road
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5
Continue straight
1541 ft · 48 sec
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6
Turn left
92.2 mi · 1 hr 57 min
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7
Turn left onto Main Street
1.1 km · 1 min · Main Street
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8
Turn slight right onto US 93: Missoula
135.6 mi · 2 hr 59 min
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9
Continue on Brooks Street
2981 ft · 1 min · Brooks Street
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10
Turn left onto South Reserve Street
5.4 mi · 9 min · South Reserve Street
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11
Turn left onto I 90 West, US 93 North, MT 200 West: Kalispell, Coeur D' Alene
1726 ft · 44 sec
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12
Merge slight left onto Jeannette Rankin Memorial Highway
169.2 mi · 2 hr 58 min · Jeannette Rankin Memorial Highway
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13
Take the exit slight right toward Spokane Street
1913 ft · 50 sec
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14
Turn right onto North Spokane Street
1710 ft · 1 min · North Spokane Street
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15
Turn left onto West 10th Avenue
872 ft · 38 sec · West 10th Avenue
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16
Arrive at your destination
0 m · 1 sec · West 10th Avenue
Car Route Details
A richer read on the saved driving route between Ketchum and Post Falls.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Jeannette Rankin Memorial Highway
Merge slight left onto Jeannette Rankin Memorial Highway
169 mi · 02h 58m
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 Snow then Snow Showers leaving Ketchum 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 Ketchum to Post Falls?
The road trip is about 446.6 miles (718.7 km) and usually takes 08h 36m 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 223.1 miles from Ketchum and 223.5 miles from Post Falls.
How much longer is the road route than the straight-line distance?
The direct path is about 305.6 miles (491.8 km), while the road route adds roughly 141 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 $61.35 one way or $122.71 round trip. Estimated CO2 is about 140.1 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Ketchum 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 Snow then Snow Showers around Ketchum and Rain near Post Falls.
Flight Path Map
This map shows the direct air route between Ketchum and Post Falls. Straight-line distance: 305.58 mi (491.78 km).
#1 Ketchum
City in Blaine County, Idaho, United States
| Population | 2,855 |
| Coordinates | 43.6807400, -114.3636600 |
| Altitude | 1784 |
| 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: 719 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 14h 52m |
| 40 mph (64.37 km/h) | 11h 09m |
| 50 mph (80.47 km/h) | 08h 55m |
| 60 mph (96.56 km/h) | 07h 26m |
| 70 mph (112.65 km/h) | 06h 22m |
| 80 mph (129 km/h) | 05h 34m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $61.35 | $122.71 |
| Mid-grade | $4.23 | $66.68 | $133.36 |
| Premium | $4.55 | $71.69 | $143.38 |
| Diesel | $5.41 | $85.29 | $170.59 |
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.