Distance between cities › USA › South Dakota › Dewey, SD › Distance from Dewey to Seneca Book Hotels

Distance from Dewey, SD to Seneca, NE

Distance

255 mi

Time

5 hours 31 mins

Gas Cost

$24 - $46

There are 192.44 miles from Dewey to Seneca in southeast direction and 255 miles (410.38 kilometers) by car, following the N-2 route.

Dewey and Seneca are 5 hours 31 mins far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Seneca, NE.

Please note the time difference between Dewey, SD and Seneca, NE is 1 hour. The current time in Dewey is 6:05 am and the current time in Seneca is 7:05 am.

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Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Seneca, NE? Here there are some offers to rent a car in Dewey, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Dewey »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 10.23 gallons of gas to cover the route between Dewey, SD and Seneca, NE.

The estimated cost of gas to go from Dewey to Seneca is $33.39.

During the route, an average car will release 200.52 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 Dewey, SD and Seneca, NE

If you want to meet halfway between Dewey, SD and Seneca, NE or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 42.181722 and -102.952128, or 42º 10' 54.1992" N, 102º 57' 7.6608" W. This location is 127.42 miles away from Dewey, SD and Seneca, NE and it would take approximately 2 hours 45 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Alliance, NE, situated 145 miles from Dewey, SD and 110 miles from Seneca, NE. It would take 3 hours 20 mins to go from Dewey to Alliance and 2 hours 12 mins to go from Seneca to Alliance.