Distance between cities › USA › Illinois › Rio, IL › Distance from Rio to San Augustine Book Hotels

Distance from Rio, IL to San Augustine, TX

Distance

863 mi

Time

15 hours 55 mins

Gas Cost

$80 - $156

There are 693.09 miles from Rio to San Augustine in southwest direction and 863 miles (1,388.86 kilometers) by car, following the US-67 route.

Rio and San Augustine are 15 hours 55 mins far apart, if you drive non-stop .

This is the fastest route from Rio, IL to San Augustine, TX.

Rio, IL and San Augustine, TX are in the same time zone (CDT). Current time in both locations is 3:04 am.

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Lowest Price Rental Cars in Rio, IL

Planning on renting a car to go from Rio, IL to San Augustine, TX? Here there are some offers to rent a car in Rio, IL

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Rio »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 34.66 gallons of gas to cover the route between Rio, IL and San Augustine, TX.

The estimated cost of gas to go from Rio to San Augustine is $113.06.

During the route, an average car will release 679.06 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 Rio, IL and San Augustine, TX

If you want to meet halfway between Rio, IL and San Augustine, TX or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 36.281697 and -90.931222, or 36º 16' 54.1092" N, 90º 55' 52.3992" W. This location is 431.52 miles away from Rio, IL and San Augustine, TX and it would take approximately 7 hours 57 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Pocahontas, AR, situated 433 miles from Rio, IL and 431 miles from San Augustine, TX. It would take 8 hours 9 mins to go from Rio to Pocahontas and 7 hours 45 mins to go from San Augustine to Pocahontas.