How far is Lewiston, ID from Sun Valley, ID?
The driving distance from Lewiston, ID to Sun Valley, ID is about 378.5 miles (609.1 km), with a travel time of about 08h 30m by car.
- The straight-line flight distance is about 228.5 miles (367.8 km).
- For a round trip, plan for roughly 17h 01m 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 08h 30m.
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.
Rural city in and the county seat of Valley County, Idaho, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny then Slight Chance Snow Showers
Driving Route Map
The map below follows the saved road route between Lewiston and Sun Valley.
Turn-by-Turn Driving Directions
Step-by-step road directions between Lewiston and Sun Valley.
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1
Start on the route
32 m · 10 sec
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2
Turn right onto Idaho Street
1 km · 2 min · Idaho Street
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3
Turn right onto 19th Street
88 m · 18 sec · 19th Street
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4
Turn left onto 7th Avenue
669 ft · 31 sec · 7th Avenue
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5
At the end of the road, turn left onto 21st Street
103 m · 10 sec · 21st Street
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6
Continue straight
1.6 km · 2 min
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7
Keep slight right to continue on US 95 South: Missoula, Boise
9.3 mi · 11 min
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8
Continue straight
58.6 mi · 1 hr 8 min
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9
Turn right onto Johnston Road
2.2 mi · 5 min · Johnston Road
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10
Turn right
76.4 mi · 1 hr 27 min
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11
Turn left
10.6 mi · 16 min
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12
Turn right onto Boydstun Street
1.5 km · 2 min · Boydstun Street
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13
Continue on East Deinhard Lane
1.6 mi · 3 min · East Deinhard Lane
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14
Turn right onto South 3rd Street
45.6 mi · 1 hr 2 min · South 3rd Street
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15
Continue on ID 55
18.4 mi · 25 min · ID 55
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16
Turn left onto Banks Lowman Road
33.3 mi · 59 min · Banks Lowman Road
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17
Turn left onto Ponderosa Pine Scenic Route
32.8 mi · 45 min · Ponderosa Pine Scenic Route
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18
Continue on State Highway 21
24.4 mi · 28 min · State Highway 21
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19
Continue on Eva Falls Avenue
1 mi · 2 min · Eva Falls Avenue
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20
At the end of the road, turn right
60.1 mi · 1 hr 29 min
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21
Turn left onto Saddle Road
2904 ft · 1 min · Saddle Road
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22
Turn left onto Sun Valley Road
2677 ft · 1 min · Sun Valley Road
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23
Turn right onto Moritz Road
851 ft · 37 sec · Moritz Road
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24
Turn right onto Inn Entry Lane
88 m · 13 sec · Inn Entry Lane
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25
Arrive at your destination
0 m · 1 sec · Inn Entry Lane
Car Route Details
A richer read on the saved driving route between Lewiston and Sun Valley.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Longest stretch
Turn right
76.4 mi · 01h 27m
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.
Sunny leaving Lewiston and Mostly Sunny then Slight Chance Snow Showers near Sun Valley.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Lewiston to Sun Valley?
The road trip is about 378.5 miles (609.1 km) and usually takes 08h 30m 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?
Cascade is a useful midpoint, sitting about 189.1 miles from Lewiston and 189.4 miles from Sun Valley.
How much longer is the road route than the straight-line distance?
The direct path is about 228.5 miles (367.8 km), while the road route adds roughly 150 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 $52.01 one way or $104.02 round trip. Estimated CO2 is about 118.7 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Lewiston and Sun Valley, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Sunny around Lewiston and Mostly Sunny then Slight Chance Snow Showers near Sun Valley.
Stop Ideas Near Cascade
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 Cascade.
McCall, Idaho
Ontario
Boise, Idaho
Nampa, Idaho
Flight Path Map
This map shows the direct air route between Lewiston and Sun Valley. Straight-line distance: 228.52 mi (367.76 km).
#1 Lewiston
City in Nez Perce County, Idaho, USA
| Population | 32,788 |
| Coordinates | 46.4165500, -117.0176600 |
| Altitude | 227 |
| Country | United States |
#2 Sun Valley
Resort city in Blaine County, Idaho, United States
| Population | 1,486 |
| Coordinates | 43.6971300, -114.3517200 |
| Altitude | 1812 |
| Country | United States |
End: Sun Valley (-114.35172, 43.69713)
Estimated Travel Time
Distance: 609 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 12h 36m |
| 40 mph (64.37 km/h) | 09h 27m |
| 50 mph (80.47 km/h) | 07h 34m |
| 60 mph (96.56 km/h) | 06h 18m |
| 70 mph (112.65 km/h) | 05h 24m |
| 80 mph (129 km/h) | 04h 43m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $52.01 | $104.02 |
| Mid-grade | $4.23 | $56.53 | $113.05 |
| Premium | $4.55 | $60.77 | $121.55 |
| Diesel | $5.41 | $72.30 | $144.61 |
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 17, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.