Marengo to Sioux City is 265 miles and takes about 5 hours 20 minutes via US 20 and I-35, with a fuel budget near $42 and enough daylight to finish in a day. This trip stays within Iowa, traversing the heart of the Midwest. Given its mostly highway profile and single-day duration, it's a straightforward drive for those looking to cover ground efficiently. The route offers a consistent pace, making it ideal for a quick transfer between these two points in Iowa.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
132.6 miles from Marengo, IA
A natural place for your longest stop of the day
, about 2h 41m into the drive
.
Main Roads
Road
Distance
Duration
US 20
145 mi
2h 51m
Lincoln Highway
65.7 mi
1h 16m
I 35
30.4 mi
32m
212th Boulevard
11.2 mi
16m
13th Street
5.4 mi
8m
11th Avenue
1.5 mi
2m
State Highway 21
1.4 mi
2m
6th Street
0.9 mi
2m
Longest stretch:
US 20
— 145 mi, about 2h 51m
Traffic on I-35
Hour-of-day weekday pattern from 8 FHWA count stations on your route.
Peak
3 PM
~974 veh/hr typical
· worst 1,494
Quietest
2 AM
~96 veh/hr
Peak-to-quiet ratio
10.1×
busier at peak than in the quiet hours
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Averaged across 99 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Marengo, IA and Sioux City, IA.
1
Start on this road
135 ft·12 sec·this road
2
Turn right onto West Marion Street
0.1 mi·29 sec·West Marion Street
3
Turn left onto Lafayette Avenue
280 ft·14 sec·Lafayette Avenue
4
Turn right onto West South Street
0.3 mi·40 sec·West South Street
5
Continue on IA 212
11 mi·16 min·212th Boulevard
6
Turn right onto IA 21
1.4 mi·2 min·State Highway 21
7
Continue on IA 21
1.5 mi·2 min·11th Avenue
8
Continue on IA 21
0.8 mi·1 min·7th Avenue
9
Turn left onto IA 21
5.4 mi·8 min·13th Street
10
Take the ramp
0.3 mi·48 sec
11
Merge onto US 30
0.1 mi·10 sec·73rd Street
12
Continue on US 30
66 mi·1 hr 16 min·Lincoln Highway
13
Take the exit
0.6 mi·1 min
Toward I 35 North: Minneapolis
14
Merge onto I 35
30 mi·32 min·I 35
15
Take the exit
0.3 mi·56 sec
Toward US 20 West: Fort Dodge
16
Merge onto US 20
145 mi·2 hr 51 min·US 20
Use the straight lane.
17
Turn right onto South Fairmount Street
0.6 mi·1 min·South Fairmount Street
Use the right lane.
18
Continue on 6th Street
0.9 mi·2 min·6th Street
19
Turn right onto Court Street
0.2 mi·39 sec·Court Street
20
Turn left onto 9th Street
0.2 mi·45 sec·9th Street
21
Turn right
115 ft·8 sec
22
Arrive at destination
Trip Plan
Aim to depart Marengo in the morning to take full advantage of the 5-hour 20-minute drive time. With only one recommended stop, you have flexibility to add more if needed, but the longest stretch without a significant change in road type is 145 miles on US 20. Keep an eye on your fuel gauge, as the estimated cost is $42, and plan your refueling stops accordingly, especially before longer segments. This route is easily manageable in a single day, so you can leave later if your schedule requires.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 132.6 miles from Marengo, IA, or about 2h 41m into the drive.
The longest continuous stretch on this route runs about 145 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 58 miles or 1h 15m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 132.6 miles or 2h 41m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 21m
Traffic, exits, and arrival timing usually matter more near Sioux City, IA than in the middle of the route.
Before You Leave
+
Open the route before leaving Marengo, IA 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.
Day 1
Settle into the route from Marengo, IA
This is one driving day of about 265.3 miles and 5h 20m.
Your first comfortable stop window is around 58 miles from Marengo, IA.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on US 20 for about 145 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 14
5 decision points cluster between mile 0.1 and 265.2 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.1 mi into trip|~0m in|Lafayette Avenue
Turn left onto Lafayette Avenue
Navigation decision point
5
118.3 mi into trip|~2h 24m in|US 20
Merge onto US 20
Merge point - match speed before joining. Lane positioning matters here
Use the straight lane.
6
263.3 mi into trip|~5h 15m in|South Fairmount Street
Turn right onto South Fairmount Street
Lane positioning matters here
Use the right lane.
5
265 mi into trip|~5h 20m in|9th Street
Turn left onto 9th Street
Navigation decision point
5
265.2 mi into trip|~5h 20m in
Turn right
Navigation decision point
Fuel & Cost
Regular Gas
$44.25 one way
$88.51 round trip
$4.24/gal25.4 MPG avg93 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.62
$48.29
$96.57
premium
$5.25
$54.87
$109.73
diesel
$6.28
$65.55
$131.10
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$44
Meals
$25–$50
Total
$69–$94
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 92.8 kg one way.
Prices: EIA weekly data, 2026-10-19.
Driving Electric?
About $28 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
79.6
0
$27.86
$12.73
Efficient EV
66.3
0
$23.21
$10.61
EV Truck/SUV
106.1
1
$37.14
$16.98
Gas CO2
93 kg
EV CO2
31 kg (67% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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 Oct 19, 2026
Origin
Marengo, IA
Afternoon
in Marengo on Thursday
Local time
3:07 PM
CDT
Current temp
70°F
Mostly Sunny
S 0 to 5 mph0% chanceLive forecast
Destination
Sioux City, IA
Afternoon
in Sioux City on Thursday
Local time
3:07 PM
CDT
Current temp
66°F
Mostly Sunny
SE 5 to 10 mph0% chanceLive forecast
59°F
Gilbert, IA
133 mi in
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.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
4 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
5h 20m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
More Details
What kind of drive is this?
You'll be on highways for about 67% of this 265-mile trip. The longest continuous stretch on US 20 covers 145 miles, so expect some extended periods of cruising. After leaving the interstate system, you'll transition to surface roads. This transition often means fewer exits and a change in the surrounding environment.
67% highway — fuel and pacing are the main things to plan.
22 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 145 mi on US 20.
How Hard Is This Drive?
3/10
This is a straightforward highway drive that stays mostly on US 20 and Lincoln Highway. There are only a few real navigation decisions along the way. The trickiest moment comes around 0.1 miles in near Lafayette Avenue.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 5h 20m drive. You will face about 14 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: at 0.1 miles (Lafayette Avenue): Navigation decision point; at 118.3 miles (US 20): Merge point - match speed before joining. Lane positioning matters here; at 263.3 miles (South Fairmount Street): Lane positioning matters here.
Sioux City is on the western edge of the state of Iowa. It is on the Missouri River and many parts of Sioux City are among the unique Loess Hills formations.
Top landmarks
•Sergeant Floyd — museum boat in Sioux City, Iowa, United States
•Woodbury County Courthouse — county courthouse in Sioux City, United States of America
•St. Boniface Catholic Church — church building in Sioux City, United States of America
The longest stretch is about 145 miles on US 20. The full list of main roads is in the Roads section above.
Yes — we found about 8 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 8 rest areas along the route for bathroom stops.
The main spots that need attention: at 0.1 miles (Lafayette Avenue): Navigation decision point; at 118.3 miles (US 20): Merge point - match speed before joining. Lane positioning matters here; at 263.3 miles (South Fairmount Street): Lane positioning matters here.
Not recommended in a single day. At 5.3 hours each way, a round trip means 10.7 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Sioux City, IA before the return drive.
