Driving distance from O'Fallon, IL to Katy, TX is 0 miles (0 km). How far is it from O'Fallon, IL to Katy, TX? It's a drive by car. Flight distance is approximately 696 miles (1120 km) and flight time from O'Fallon, IL to Katy, TX is 01 hours 23 minutes. Don't forget to check out our "Gas cost calculator" option. It will calculate cost of driving this particular distance. See the map below for the visual display of the upcoming road trip.
To travel the distance from O'Fallon, IL to Katy, TX, please, click on the map to see the route for the journey. "Gas Cost Calculator" tool is to your right. You can always modify it and make the number more applicable for your journey.
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