Distance between cities › USA › South Dakota › Harrison, SD › Distance from Harrison to Union Book Hotels

Distance from Harrison, SD to Union, IA

Distance

343 mi

Time

7 hours 7 mins

Gas Cost

$32 - $62

There are 288.55 miles from Harrison to Union in southeast direction and 343 miles (552.00 kilometers) by car, following the US-20 route.

Harrison and Union are 7 hours 7 mins far apart, if you drive non-stop .

This is the fastest route from Harrison, SD to Union, IA.

Harrison, SD and Union, IA are in the same time zone (CDT). Current time in both locations is 3:38 am.

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Lowest Price Rental Cars in Harrison, SD

Planning on renting a car to go from Harrison, SD to Union, IA? Here there are some offers to rent a car in Harrison, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Harrison »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 13.76 gallons of gas to cover the route between Harrison, SD and Union, IA.

The estimated cost of gas to go from Harrison to Union is $44.88.

During the route, an average car will release 269.57 pounds of CO₂ to the atmosphere. The carbon footprint would be 0.79 pounds of CO₂ per mile.

Average USA gas price used for calculation is $3.26 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Harrison, SD and Union, IA

If you want to meet halfway between Harrison, SD and Union, IA or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 42.481672 and -96.071405, or 42º 28' 54.0192" N, 96º 4' 17.058" W. This location is 171.30 miles away from Harrison, SD and Union, IA and it would take approximately 3 hours 33 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Moville, IA, situated 177 miles from Harrison, SD and 167 miles from Union, IA. It would take 3 hours 45 mins to go from Harrison to Moville and 3 hours 25 mins to go from Union to Moville.