CHI - ONT
$232 - $381
|Popular in||December||High demand for flights, 25% potential price rise|
|Cheapest in||September||Best time to find cheap flights, 19% potential price drop|
|Round-trip from||$232||From Chicago to Ontario International|
|One-way from||$125||One-way flight from Chicago to Ontario International|
Flying to your destination on a Saturday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Ontario International. Check prices with Cheapflights to find a great deal for your trip.
Travelers have found it’s best to book a flight 17 days in advance to save up to 8% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 17 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Chicago to Ontario International 1-2 weeks in advance for as low as $87, or $97 for flights within the next 24 hours.
Our data shows that September tends to be the cheapest month to fly to Ontario International from Chicago. Users have commonly found prices around $95 for the month, but tickets can be as low as $46. Due to multiple factors, prepare for potentially higher prices in December.
One of the essential ways to save on airfare from Chicago to Ontario International is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. If a flight is in the afternoon is possible it can save you up to 24% on airfare.
|Afternoon Noon to 6 PM||63% of CHI to ONT departures|
|Morning 6 AM to noon||36% of CHI to ONT departures|
|Early morning Midnight to 6 AM||1% of CHI to ONT departures|
|Evening 6 PM to midnight||0% of CHI to ONT departures|