How long is the drive from Olathe, KS to Denver, CO? The total driving time is 9 hours, 7 minutes. Your trip begins in Olathe, Kansas. It ends in Denver, Colorado. If you're planning a road trip, you might be interested in seeing the total driving distance from Olathe, KS to Denver, CO. You can also calculate the cost to drive from Olathe, KS to Denver, CO based on current local gas prices and an estimate of your car's best gas mileage. Since this is a long drive, you might want to stop halfway and stay overnight in a hotel. You can find the city that is halfway between Olathe, KS and Denver, CO.