How far is Mason City, IA from Johnston, IA?
The driving distance from Mason City, IA to Johnston, IA is about 122.2 miles (196.7 km), with a travel time of about 02h 19m by car.
- The straight-line flight distance is about 105.4 miles (169.6 km).
- For a round trip, plan for roughly 04h 38m 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 19m.
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 Hamilton County, Iowa, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Widespread Frost then Mostly Sunny
Partly Sunny
Driving Route Map
The map below follows the saved road route between Mason City and Johnston.
Turn-by-Turn Driving Directions
Step-by-step road directions between Mason City and Johnston.
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1
Start on 2nd Street Northeast
7 m · 6 sec · 2nd Street Northeast
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2
Turn left onto North Federal Avenue
100 m · 17 sec · North Federal Avenue
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3
Turn right onto 1st Street Northwest
2017 ft · 48 sec · 1st Street Northwest
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4
Turn left onto North Monroe Avenue
1.3 mi · 3 min · North Monroe Avenue
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5
Turn right onto 19th Street Southwest
2.5 mi · 4 min · 19th Street Southwest
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6
Turn left onto South Eisenhower Avenue
2624 ft · 41 sec · South Eisenhower Avenue
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7
Continue on Mallard Avenue
1.4 mi · 2 min · Mallard Avenue
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8
Take the ramp right
2217 ft · 54 sec
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9
Merge slight left onto Avenue of the Saints
3.5 mi · 4 min · Avenue of the Saints
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10
Take the exit slight left toward I 35 South: Des Moines
1.4 km · 1 min
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11
Continue on I 35 South: Des Moines
2643 ft · 32 sec
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12
Merge slight left
102.7 mi · 1 hr 51 min
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13
Keep slight right to continue on I 35 South, I 80: Kansas City, Council Bluffs, Davenport
6.4 mi · 7 min
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14
Take the exit slight right toward IA 28 South: Merle Hay Road, Saylorville Lake
1872 ft · 49 sec
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15
Turn right onto Merle Hay Road
1.4 mi · 3 min · Merle Hay Road
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16
Arrive at your destination
0 m · 1 sec · Merle Hay Road
Car Route Details
A richer read on the saved driving route between Mason City and Johnston.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 35 South
Merge slight left
103 mi · 01h 51m
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.
Widespread Frost then Mostly Sunny leaving Mason City 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 Mason City to Johnston?
The road trip is about 122.2 miles (196.7 km) and usually takes 02h 19m 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?
Williams is a useful midpoint, sitting about 61.1 miles from Mason City and 61.1 miles from Johnston.
How much longer is the road route than the straight-line distance?
The direct path is about 105.4 miles (169.6 km), while the road route adds roughly 16.8 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 1:52 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $16.25 one way or $32.51 round trip. Estimated CO2 is about 38.3 kg one way.
What should you check before leaving?
Before you leave, expect Widespread Frost then Mostly Sunny around Mason City and Partly Sunny near Johnston.
Flight Path Map
This map shows the direct air route between Mason City and Johnston. Straight-line distance: 105.38 mi (169.6 km).
#1 Mason City
City in Cerro Gordo County, Iowa
| Population | 26,931 |
| Coordinates | 43.1535700, -93.2010400 |
| Altitude | 344 |
| 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: 197 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 04h 04m |
| 40 mph (64.37 km/h) | 03h 03m |
| 50 mph (80.47 km/h) | 02h 26m |
| 60 mph (96.56 km/h) | 02h 02m |
| 70 mph (112.65 km/h) | 01h 44m |
| 80 mph (129 km/h) | 01h 31m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $16.25 | $32.51 |
| Mid-grade | $4.25 | $18.33 | $36.66 |
| Premium | $4.65 | $20.06 | $40.12 |
| Diesel | $5.30 | $22.86 | $45.72 |
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.