How far is Waterloo, IA from Johnston, IA?
The driving distance from Waterloo, IA to Johnston, IA is about 113.2 miles (182.1 km), with a travel time of about 02h 27m by car.
- The straight-line flight distance is about 89.6 miles (144.2 km).
- For a round trip, plan for roughly 04h 55m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM CDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 02h 27m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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 Marshall County, Iowa
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Partly Sunny
Driving Route Map
The map below follows the saved road route between Waterloo and Johnston.
Turn-by-Turn Driving Directions
Step-by-step road directions between Waterloo and Johnston.
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1
Start on West 4th Street
23 m · 6 sec · West 4th Street
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2
Turn right onto Washington Street
117 m · 10 sec · Washington Street
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3
Turn right onto West 5th Street
1622 ft · 34 sec · West 5th Street
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4
Continue on West 4th Street
2.4 mi · 4 min · West 4th Street
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5
Turn slight right onto West Ridgeway Avenue
3073 ft · 1 min · West Ridgeway Avenue
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6
Turn left onto Sergeant Road
1.3 km · 1 min · Sergeant Road
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7
Take the ramp left
1428 ft · 36 sec
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8
Merge slight left onto Avenue of the Saints
18.4 mi · 21 min · Avenue of the Saints
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9
Take the exit slight right toward IA 14: Parkersburg, Grundy Center
2083 ft · 59 sec
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10
Turn left onto N Avenue
4.5 mi · 6 min · N Avenue
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11
Turn right onto 210th Street
1.6 km · 1 min · 210th Street
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12
Turn sharp left onto County Road T37
1 mi · 1 min · County Road T37
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13
Continue on M Avenue
1.5 mi · 2 min · M Avenue
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14
Turn right onto 240th Street
6.3 mi · 9 min · 240th Street
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15
Turn left onto Sanford Avenue
15.9 mi · 22 min · Sanford Avenue
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16
Turn right onto 160th Street
4.3 mi · 6 min · 160th Street
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17
Keep slight left to continue on North Main Street
1.2 mi · 2 min · North Main Street
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18
Continue on Marsh Avenue
5.9 mi · 8 min · Marsh Avenue
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19
Turn right
35.9 mi · 43 min
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20
Take the exit slight right toward I 80 west, US 65 south: Des Moines
10.6 mi · 13 min
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21
Take the exit slight right toward IA 28 South: Merle Hay Road, Saylorville Lake
1872 ft · 49 sec
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22
Turn right onto Merle Hay Road
1.4 mi · 3 min · Merle Hay Road
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23
Arrive at your destination
0 m · 1 sec · Merle Hay Road
Car Route Details
A richer read on the saved driving route between Waterloo and Johnston.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Longest stretch
Turn right
35.9 mi · 00h 43m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Mostly Sunny leaving Waterloo and Partly Sunny near Johnston.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Waterloo to Johnston?
The road trip is about 113.2 miles (182.1 km) and usually takes 02h 27m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Albion is a useful midpoint, sitting about 56.5 miles from Waterloo and 56.6 miles from Johnston.
How much longer is the road route than the straight-line distance?
The direct path is about 89.6 miles (144.2 km), while the road route adds roughly 23.6 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 8:00 AM to 10:00 AM CDT. If you want a more comfortable same-day return, try to leave by 1:34 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $15.05 one way or $30.09 round trip. Estimated CO2 is about 35.5 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Waterloo and Partly Sunny near Johnston.
Flight Path Map
This map shows the direct air route between Waterloo and Johnston. Straight-line distance: 89.63 mi (144.25 km).
#1 Waterloo
The most populous city in Black Hawk County, Iowa.
| Population | 67,292 |
| Coordinates | 42.4927600, -92.3429600 |
| Altitude | 261 |
| Country | United States |
#2 Johnston
City in Iowa, United States
| Population | 23,092 |
| Coordinates | 41.6730400, -93.6977200 |
| Altitude | 253 |
| Country | United States |
End: Johnston (-93.69772, 41.67304)
Estimated Travel Time
Distance: 182 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 46m |
| 40 mph (64.37 km/h) | 02h 49m |
| 50 mph (80.47 km/h) | 02h 15m |
| 60 mph (96.56 km/h) | 01h 53m |
| 70 mph (112.65 km/h) | 01h 36m |
| 80 mph (129 km/h) | 01h 24m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $15.05 | $30.09 |
| Mid-grade | $4.25 | $16.97 | $33.94 |
| Premium | $4.65 | $18.57 | $37.14 |
| Diesel | $5.30 | $21.16 | $42.33 |
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 Iowa · May 07, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.