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

Distance from Dewey, SD to Seaside, OR

Distance

1,307 mi

Time

23 hours 46 mins

Gas Cost

$122 - $237

There are 987.42 miles from Dewey to Seaside in west direction and 1,307 miles (2,103.41 kilometers) by car, following the I-90 route.

Dewey and Seaside are 23 hours 46 mins far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Seaside, OR.

Please note the time difference between Dewey, SD and Seaside, OR is 1 hour. The current time in Dewey is 4:43 am and the current time in Seaside is 3:43 am.

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Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Seaside, OR? 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 52.49 gallons of gas to cover the route between Dewey, SD and Seaside, OR.

The estimated cost of gas to go from Dewey to Seaside is $171.22.

During the route, an average car will release 1,028.35 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 Seaside, OR

If you want to meet halfway between Dewey, SD and Seaside, OR or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 46.744671 and -113.702936, or 46º 44' 40.8156" N, 113º 42' 10.5696" W. This location is 653.48 miles away from Dewey, SD and Seaside, OR and it would take approximately 11 hours 53 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Clinton, MT, situated 665 miles from Dewey, SD and 644 miles from Seaside, OR. It would take 11 hours 42 mins to go from Dewey to Clinton and 12 hours 10 mins to go from Seaside to Clinton.