Distance Between Ontario and Monmouth = Miles
Calculated driving distance between Ontario, Oregon and Monmouth, Oregon is miles, this equals kilometres. Estimated driving time is in current traffic conditions. With an average car, this trip would cost around $ in gasoline, since you would need about gallons of fuel.(Based on current US Gas prices and average mileage of 3.6 gallons gas per mile).
Leaving from Ontario, Oregon located in Oregon - United States you would reach Monmouth, Oregon (Oregon - United States) in about driving an average speed of miles per hour to cover the miles, assuming traffic conditions stay unchanged and you don't take any breaks.
The map overview below shows the best driving route from Ontario, Oregon to Monmouth, Oregon as a blue line on the map, with starting point (Ontario) marked A, and destination point (Monmouth) marked B. You can zoom in on the map to view road numbers, street names and other details both in Ontario, Oregon and Monmouth, Oregon as well as every other town near or on your route.