Distance between cities › USA › Missouri › Saint James, MO › Distance from Saint James to Keystone Book Hotels

Distance from Saint James, MO to Keystone, SD

Distance

947 mi

Time

16 hours 37 mins

Gas Cost

$88 - $172

There are 737.48 miles from Saint James to Keystone in northwest direction and 947 miles (1,524.05 kilometers) by car, following the I-90 route.

Saint James and Keystone are 16 hours 37 mins far apart, if you drive non-stop .

This is the fastest route from Saint James, MO to Keystone, SD.

Please note the time difference between Saint James, MO and Keystone, SD is 1 hour. The current time in Saint James is 8:14 pm and the current time in Keystone is 7:14 pm.

Any questions or tips to share?

Share with fellow travellers any question or tips about the route from Saint James, MO to Keystone, SD:

Lowest Price Rental Cars in Saint James, MO

Planning on renting a car to go from Saint James, MO to Keystone, SD? Here there are some offers to rent a car in Saint James, MO

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Saint James »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 38.04 gallons of gas to cover the route between Saint James, MO and Keystone, SD.

The estimated cost of gas to go from Saint James to Keystone is $124.10.

During the route, an average car will release 745.37 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 Saint James, MO and Keystone, SD

If you want to meet halfway between Saint James, MO and Keystone, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 42.495046 and -96.475976, or 42º 29' 42.1656" N, 96º 28' 33.5136" W. This location is 473.66 miles away from Saint James, MO and Keystone, SD and it would take approximately 8 hours 18 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Dakota Dunes, SD, situated 507 miles from Saint James, MO and 445 miles from Keystone, SD. It would take 9 hours 33 mins to go from Saint James to Dakota Dunes and 7 hours 18 mins to go from Keystone to Dakota Dunes.