Distance between cities › USA › Illinois › Royal, IL › Distance from Royal to Seneca Book Hotels

Distance from Royal, IL to Seneca, MO

Distance

500 mi

Time

9 hours 18 mins

Gas Cost

$47 - $91

There are 426.90 miles from Royal to Seneca in southwest direction and 500 miles (804.67 kilometers) by car, following the I-44 and US-50 route.

Royal and Seneca are 9 hours 18 mins far apart, if you drive non-stop .

This is the fastest route from Royal, IL to Seneca, MO.

Royal, IL and Seneca, MO are in the same time zone (CDT). Current time in both locations is 3:49 am.

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Lowest Price Rental Cars in Royal, IL

Planning on renting a car to go from Royal, IL to Seneca, MO? Here there are some offers to rent a car in Royal, IL

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Royal »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 20.07 gallons of gas to cover the route between Royal, IL and Seneca, MO.

The estimated cost of gas to go from Royal to Seneca is $66.04.

During the route, an average car will release 393.14 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 $3.29 per gallon of regular gas. Price last updated on March 13, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Royal, IL and Seneca, MO

If you want to meet halfway between Royal, IL and Seneca, MO or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 38.356077 and -90.984132, or 38º 21' 21.8772" N, 90º 59' 2.8752" W. This location is 249.82 miles away from Royal, IL and Seneca, MO and it would take approximately 4 hours 39 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Saint Clair, MO, situated 252 miles from Royal, IL and 248 miles from Seneca, MO. It would take 4 hours 47 mins to go from Royal to Saint Clair and 4 hours 35 mins to go from Seneca to Saint Clair.