Distance between cities › USA › Montana › Pray, MT › Distance from Pray to O Fallon Book Hotels

Distance from Pray, MT to O Fallon, IL

Distance

1,421 mi

Time

1 day 1 hour

Gas Cost

$132 - $258

There are 1,160.91 miles from Pray to O Fallon in southeast direction and 1,421 miles (2,286.88 kilometers) by car, following the I-29 route.

Pray and O Fallon are 1 day 1 hour far apart, if you drive non-stop .

This is the fastest route from Pray, MT to O Fallon, IL.

Please note the time difference between Pray, MT and O Fallon, IL is 1 hour. The current time in Pray is 2:07 am and the current time in O Fallon is 3:07 am.

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Lowest Price Rental Cars in Pray, MT

Planning on renting a car to go from Pray, MT to O Fallon, IL? Here there are some offers to rent a car in Pray, MT

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Pray »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 57.08 gallons of gas to cover the route between Pray, MT and O Fallon, IL.

The estimated cost of gas to go from Pray to O Fallon is $186.21.

During the route, an average car will release 1,118.40 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 Pray, MT and O Fallon, IL

If you want to meet halfway between Pray, MT and O Fallon, IL or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.750736 and -99.044899, or 43º 45' 2.6496" N, 99º 2' 41.6364" W. This location is 710.70 miles away from Pray, MT and O Fallon, IL and it would take approximately 12 hours 33 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Kimball, SD, situated 678 miles from Pray, MT and 744 miles from O Fallon, IL. It would take 11 hours 46 mins to go from Pray to Kimball and 13 hours 24 mins to go from O Fallon to Kimball.