The drive from Lewiston, ID to Sun Valley, ID covers 378.5 miles and takes about 8h 30m behind the wheel.
It usually feels better as a 2-day road trip than as one long push.
The route leans on US 95, ID 75, South 3rd Street for much of the mileage,
and the overall profile is highway-focused drive.
The longest uninterrupted segment is about 135 miles on US 95.
At current regular gas prices, budget about $59.98 one way before food or hotel costs.
Trip Pace
Best split across 2 days
Treat the return leg as its own travel day rather than an afterthought.
Break Rhythm
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
189.2 miles from Lewiston, ID
A natural place for your longest stop of the day
, about 3h 54m into the drive
.
Who Is This Route For?
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
This is a 8h 30m highway drive covering 378.5 miles, with most of the trip on US 95 and ID 75. The longest continuous stretch is about 135 miles on US 95.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 25 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
US 95 is the longest continuous segment at about 135 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on US 95 and ID 75. There are only a few real navigation decisions along the way. The trickiest moment comes early in the drive near Idaho Street.
Driving Effort4/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
The route itself is not hard, but at 8h 30m, endurance matters. Plan breaks every 2-3 hours. The 17 decision points are all manageable with basic attention.
Where does it get tricky?
The main spots that need attention: near the start (Idaho Street): Navigation decision point; at 0.7 miles (7th Avenue): Navigation decision point; at 0.9 miles (21st Street): Navigation decision point.
Critical Maneuvers
5 of 17 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
4
0 mi into trip|~0m in|Idaho Street
Turn right onto Idaho Street
Navigation decision point
5
0.7 mi into trip|~2m in|7th Avenue
Turn left onto 7th Avenue
Navigation decision point
5
0.9 mi into trip|~2m in|21st Street
At end of road, turn left onto 21st Street
Navigation decision point
8
1.9 mi into trip|~4m in|US 12
Keep slight right at fork onto US 12 toward US 95 South: Missoula, Boise
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight lane.
Toward US 95 South: Missoula, Boise
5
317.1 mi into trip|~6h 58m in|ID 75
At end of road, turn right onto ID 75
Navigation decision point
Main Roads
Road
Distance
Duration
US 95
135 mi
2h 35m
ID 75
60.1 mi
1h 29m
South 3rd Street
45.6 mi
1h 1m
Banks Lowman Road
33.3 mi
58m
Ponderosa Pine Scenic Route
32.8 mi
44m
ID 55
29 mi
41m
State Highway 21
24.4 mi
28m
US 12
10.3 mi
13m
Longest stretch:
US 95
— 135 mi, about 2h 35m
Turn-by-Turn Driving Directions
Step-by-step road directions between Lewiston, ID and Sun Valley, ID.
1
Start on this road
105 ft·9 sec·this road
2
Turn right onto Idaho Street
0.7 mi·1 min·Idaho Street
3
Turn right onto 19th Street
288 ft·18 sec·19th Street
4
Turn left onto 7th Avenue
0.1 mi·30 sec·7th Avenue
5
At end of road, turn left onto 21st Street
339 ft·10 sec·21st Street
6
Continue on US 12
1.0 mi·2 min·US 12
7
Keep slight right at fork onto US 12
9.3 mi·11 min·US 12
Toward US 95 South: Missoula, BoiseUse the straight lane.
8
Continue on US 95
59 mi·1 hr 8 min·US 95
9
Turn right onto Johnston Road
2.2 mi·5 min·Johnston Road
10
Turn right onto US 95
76 mi·1 hr 26 min·US 95
11
Turn left onto ID 55
11 mi·16 min·ID 55
12
Turn right onto Boydstun Street
0.9 mi·1 min·Boydstun Street
13
Continue on East Deinhard Lane
1.6 mi·2 min·East Deinhard Lane
14
Turn right onto ID 55
46 mi·1 hr 1 min·South 3rd Street
15
Continue on ID 55
18 mi·25 min·ID 55
16
Turn left onto Banks Lowman Road
33 mi·58 min·Banks Lowman Road
17
Turn left onto ID 21
33 mi·44 min·Ponderosa Pine Scenic Route
18
Continue on ID 21
24 mi·28 min·State Highway 21
19
Continue on ID 21
1.0 mi·2 min·Eva Falls Avenue
20
At end of road, turn right onto ID 75
60 mi·1 hr 29 min·ID 75
21
Turn left onto Saddle Road
0.6 mi·1 min·Saddle Road
22
Turn left onto ID 75 Spur
0.5 mi·1 min·Sun Valley Road
23
Turn right onto Moritz Road
0.2 mi·37 sec·Moritz Road
24
Turn right onto Inn Entry Lane
290 ft·12 sec·Inn Entry Lane
25
Arrive at destination
Inn Entry Lane
Trip Plan
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
This drive is better paced as a 2-day trip.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 189.2 miles from Lewiston, ID, or about 3h 54m into the drive.
The longest continuous stretch on this route runs about 135 miles.
Consider an overnight stop or starting very early.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 83 miles or 1h 42m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 189.2 miles or 3h 54m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Overnight split
Day 1 wrap after about 189.2 miles or 3h 54m
Stop before fatigue turns the last few hours into a grind. You want day two to start fresh, not just resumed.
Final approach
Final hour starts around 7h
Traffic, exits, and arrival timing usually matter more near Sun Valley, ID than in the middle of the route.
Before You Leave
+
Open the route before leaving Lewiston, ID so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
+
Pick one backup stop option before the midpoint in case traffic changes your pacing.
+
Treat this as a 2-day road trip and book the overnight stop before the busiest arrival window.
Day 1
Settle into the route from Lewiston, ID
Aim for roughly 189 miles and 4.3 hours of wheel time on this day.
Day 2
Finish the approach into Sun Valley, ID
Aim for roughly 189 miles and 4.3 hours of wheel time on this day.
Your first comfortable stop window is around 83 miles from Lewiston, ID.
This route usually feels better as a 2-day drive than as one long push.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on US 95 for about 135 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 189.2 mi from Lewiston, ID
· 3h 54m into the drive
Place data sourced from public business listings. Hours and availability may vary.
National Parks Near This Route
Worth a detour if your schedule allows.
Nez Perce National Historical Park
National Historical Park
Since time immemorial, the valleys, prairies, mountains, and plateaus of the inland northwest have been home to the nimíipuu (Nez Perce) people. Extremely resilient, they survived the settling of the...
20 mi from route
~49 min detour
Free
near mile 65.3
Park data from the National Park Service API. Alerts update every 2 hours.
Fuel & Cost
Regular Gas
$59.98 one way
$119.96 round trip
$4.03/gal25.4 MPG avg132 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.22
$62.87
$125.74
premium
$4.53
$67.52
$135.04
diesel
$5.61
$83.57
$167.14
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$60
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$190–$300
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 132.4 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $40 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
113.6
1
$39.74
$18.17
Efficient EV
94.6
1
$33.12
$15.14
EV Truck/SUV
151.4
1
$52.99
$24.22
Gas CO2
132 kg
EV CO2
44 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Apr 15, 2026
Origin
Lewiston, ID
Late night
in Lewiston on Saturday
Local time
12:56 AM
PDT
Current temp
64°F
Unavailable
Live forecast
Destination
Sun Valley, ID
Late night
in Sun Valley on Saturday
Local time
1:56 AM
MDT
Current temp
53°F
Unavailable
Live forecast
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
For long drives, weather on day two can matter just as much as conditions at departure, so check the whole travel window rather than only the first day.
Time zone
1 hour later
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
Temperature spread
11 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
8h 30m on the road
This is long enough that the arrival forecast matters almost as much as departure conditions. Recheck both ends before you roll.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Lewiston, ID to Sun Valley, ID covers 378.5 miles and takes about 8h 30m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are US 95, ID 75, South 3rd Street. Most of the drive stays on highways, so watch for ramps and exits.
Consider an overnight stop or starting very early.
Yes. This route is usually more comfortable as a 2-day drive. A sensible stopping point is after roughly 189 miles on day one.
The midpoint is about 189.2 miles from Lewiston, ID. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $59.98 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Start early — leave by 6-7 AM to arrive at a reasonable hour. This is a long drive — plan for a morning departure or consider splitting it into two days.
Plan about 2 meaningful breaks for fuel, food, or rest. Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
The route itself is not hard, but at 8h 30m, endurance matters. Plan breaks every 2-3 hours. The 17 decision points are all manageable with basic attention.
The main spots that need attention: near the start (Idaho Street): Navigation decision point; at 0.7 miles (7th Avenue): Navigation decision point; at 0.9 miles (21st Street): Navigation decision point.
The route from Lewiston, ID to Sun Valley, ID does not surface many named destination signs beyond the main corridor.
Yes. Nearby national parks include Nez Perce National Historical Park.
How this page is built
Compiled by the Trip.ovh planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
