The flight time to O Fallon from Helena is 2 hours 21 minutes . This is approximate direct flying time, and include average plane speed 510 miles per hour. Total flight distance between Helena, MT and O Fallon, MO is about one thousand, two hundred and three miles or one thousand, nine hundred and thirty-seven km. Real time can be different, and depends on the time of day, the type of aircraft, and can be significantly longer if there are transplants during the flight.
Flying time is about 2 hours 21 minutes
Select arrival and departure cities, current are Helena, MT and MO
This flight will take about two hours twenty-one minutes ;
You can buy ticket to plane or drive by car, check ; distance in miles between Helena and O Fallon
| Aircraft | Cruising speed | Time |
| Average | 510 mph | 2 hr 21 min |
| Boeing 737 | 515 mph | 2 hr 20 min |
| Boeing 777 | 554 mph | 2 hr 10 min |
| Airbus | 515 mph | 2 hr 20 min |
Dont forget to include time in airport before and after flight.
| Country | USA |
| State | Montana |
| City | Helena, MT |
| Latitude | 46.587792 |
| Longitude | -112.022219 |
| Country | USA |
| State | Missouri |
| City | O Fallon, MO |
| Latitude | 38.81061 |
| Longitude | -90.69985 |
Please note: current air time calculator show approximate distance and time between cities Helena, MT and O Fallon, MO. This values can be different if you flight from airports in this cities. To calculate exact time can be shown only when you buy ticket to the plane. We do not guarantee that there is an airline that connects city Helena and O Fallon. To find out if there is such a flight use the ticket purchase service.