How far is Lewiston, ID from Ammon, ID?
The driving distance from Lewiston, ID to Ammon, ID is about 553.3 miles (890.5 km), with a travel time of about 09h 10m by car.
- The straight-line flight distance is about 320 miles (515 km).
- For a round trip, plan for roughly 18h 21m 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 09h 10m.
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.
Rain Showers
Light Rain Likely then Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Lewiston and Ammon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Lewiston and Ammon.
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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
7.4 mi · 9 min
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8
Take the exit slight right toward US 12 East
164.2 mi · 3 hr 43 min
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9
Continue straight
32.6 mi · 39 min
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10
Continue straight
7 mi · 9 min
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11
Continue on Brooks Street
3.3 mi · 5 min · Brooks Street
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12
Continue on South Higgins Avenue
109 m · 16 sec · South Higgins Avenue
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13
Turn right onto South 6th Street East
2051 ft · 36 sec · South 6th Street East
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14
Turn left onto Arthur Avenue
906 ft · 14 sec · Arthur Avenue
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15
Continue on Madison Street
1226 ft · 16 sec · Madison Street
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16
Take the exit slight right
1249 ft · 27 sec
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17
Turn left onto Van Buren Street
133 m · 6 sec · Van Buren Street
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18
Take the exit right
1216 ft · 30 sec
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19
Merge slight left onto Jeannette Rankin Memorial Highway
111.5 mi · 1 hr 46 min · Jeannette Rankin Memorial Highway
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20
Take the exit slight right toward I 15 South: Dillon, Idaho Falls
2694 ft · 1 min
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21
Merge slight left
198 mi · 3 hr 6 min
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22
Take the exit slight right toward I 15 Business, US 20 West: Historic Downtown, Arco
1619 ft · 47 sec
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23
Continue on West Broadway Street
2164 ft · 54 sec · West Broadway Street
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24
Turn right onto South Utah Avenue
2435 ft · 50 sec · South Utah Avenue
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25
Enter the roundabout and take exit 1 toward South Utah Avenue
31 m · 2 sec · South Utah Avenue
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26
Exit the roundabout onto South Utah Avenue
781 ft · 23 sec · South Utah Avenue
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27
Turn left onto Pancheri Drive
1930 ft · 43 sec · Pancheri Drive
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28
Continue on West 17th Street
1.1 mi · 2 min · West 17th Street
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29
Turn right onto South Holmes Avenue
1.6 km · 2 min · South Holmes Avenue
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30
Turn left onto East Sunnyside Road
2.9 mi · 5 min · East Sunnyside Road
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31
Turn left onto Central Avenue
753 ft · 35 sec · Central Avenue
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32
Turn right onto Molen Street
41 m · 6 sec · Molen Street
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33
Arrive at your destination
0 m · 1 sec · Molen Street
Car Route Details
A richer read on the saved driving route between Lewiston and Ammon.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
I 15 South
Merge slight left
198 mi · 03h 06m
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 Lewiston and Light Rain Likely then Showers And Thunderstorms near Ammon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Lewiston to Ammon?
The road trip is about 553.3 miles (890.5 km) and usually takes 09h 10m 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 267 miles from Lewiston and 286.3 miles from Ammon.
How much longer is the road route than the straight-line distance?
The direct path is about 320 miles (515 km), while the road route adds roughly 233.3 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 $75.99 one way or $151.98 round trip. Estimated CO2 is about 173.5 kg one way.
Do you cross a time zone on this route?
Yes. There is about a 1 hour time difference between Lewiston and Ammon, so arrival and return times should be read in local time.
What should you check before leaving?
Before you leave, expect Rain Showers around Lewiston and Light Rain Likely then Showers And Thunderstorms near Ammon.
Flight Path Map
This map shows the direct air route between Lewiston and Ammon. Straight-line distance: 320.01 mi (515 km).
#1 Lewiston
City in Nez Perce County, Idaho, USA
| Population | 32,788 |
| Coordinates | 46.4165500, -117.0176600 |
| Altitude | 227 |
| Country | United States |
#2 Ammon
City in Idaho, United States
| Population | 17,115 |
| Coordinates | 43.4696400, -111.9666400 |
| Altitude | 1437 |
| Country | United States |
End: Molen Street (-111.966641, 43.469622)
Estimated Travel Time
Distance: 891 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 18h 26m |
| 40 mph (64.37 km/h) | 13h 50m |
| 50 mph (80.47 km/h) | 11h 03m |
| 60 mph (96.56 km/h) | 09h 13m |
| 70 mph (112.65 km/h) | 07h 54m |
| 80 mph (129 km/h) | 06h 54m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $75.99 | $151.98 |
| Mid-grade | $4.23 | $82.59 | $165.18 |
| Premium | $4.55 | $88.80 | $177.59 |
| Diesel | $5.41 | $105.64 | $211.28 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.