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Cheap flights from Chicago to Ontario International (CHI - ONT)

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The best prices from Chicago to Ontario International are usually found in September or January, booked 49 days in advance, depart on a Saturday or Tuesday and return on a Tuesday

How to find the cheapest flight from
Chicago (CHI) to Ontario International (ONT)

CHI - ONT
Price
$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
Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip 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.

How far in advance should I book a flight from Chicago to Ontario International?

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.

What is the cheapest month to fly from Chicago to Ontario International?

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.

When is the cheapest time to fly from Chicago to Ontario International (CHI - ONT)?

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.

Cheap flights from Chicago to Ontario International in August, September 2020

The best prices found for CHI to ONT flights for August, September
2 Aug - 10 Aug
$134pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
   
2 STOPS
ORD
Chicago O'Hare Intl
2 Aug - 9 Aug
$141pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
1 Aug - 29 Aug
$142pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl

Chicago to Ontario International 2020 flight deals

Cheap flights to Ontario International from Chicago found for this year
2 Aug - 10 Aug
$134pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
   
2 STOPS
ORD
Chicago O'Hare Intl
2 Aug - 9 Aug
$141pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl
1 Aug - 29 Aug
$142pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Frontier
 
1 STOP
ORD
Chicago O'Hare Intl

Last minute flights from Chicago to Ontario International

Late deals on round-trip flights to Ontario International from Chicago, departing today and this week
27 Jul - 30 Jul
$144pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
25 Jul - 26 Jul
$159pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
   
2 STOPS
ORD
Chicago O'Hare Intl
26 Jul - 30 Jul
$163pp
ORD
Chicago O'Hare Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl

One-way flights to Ontario International from Chicago

The cheapest one-way flights from Chicago to Ontario International
3:15 am - 3:00 pm
Multiple Airlines
2 Stops
13h 45m
ORD - ONT
Multiple Airlines
$125
FlightNetwork
3:19 am - 2:35 pm
Cape Air
2 Stops
13h 16m
ORD - ONT
Cape Air
$185
Ovago
3:00 am - 2:35 pm
Sun Country Air
2 Stops
13h 35m
ORD - ONT
Sun Country Air
$187
Ovago

Related info for your journey

Useful info, stats and facts about Chicago to Ontario International flights.

Flight FAQs

From Chicago to Ontario International

Are flight prices decreasing from Chicago to Ontario due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Chicago and Ontario for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

Can I find flights from Chicago to Ontario International for under $200 on Cheapflights?

Yes, there are multiple flights from Chicago to Ontario International for under $200. The cheapest flight booked recently is on Multiple Airlines for just $134, but on average you can expect to pay $161.

Are there nonstop flights from Chicago to Ontario International for under $100 on Cheapflights?

There are no nonstop flights from Chicago to Ontario International, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.

Are there last-minute flights available from Chicago to Ontario International for under $200?

There are currently 19+ open flights from Chicago to Ontario International within the next 7 days for less than $200.

What days are nonstop flights available from Chicago to Ontario?

You can find nonstop flights on the following days: Sunday, Monday, Tuesday.

Is Chicago weather warmer or cooler than Ontario?

With an average temperature of 95 °F, peak weather can be found in July. As a traveler, expect to see changes in flight prices during that period. The temperatures in Ontario are hotter than in Chicago.

How long is the flight from Chicago to Ontario International?

For as low as $246, Cape Air can have you in Ontario International from Chicago in 6h 16m. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

What are the cheapest airlines to fly from Chicago to Ontario International one-way?

One-way options have recently been found by users for as low as $123 on Delta. Other airlines that offer cheap prices include Cape Air from $185 and Sun Country Air from $187 one-way.

Alternative routes for Chicago to Ontario International

Destination information for Ontario International

Things to know before you go. Useful info for your trip from Chicago to Ontario International

Airports servicing Chicago

Chicago Midway (MDW)
Rockford (RFD)

Airports servicing Ontario

Hourly flight availability from Chicago to Ontario International

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
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Chicago to Ontario International
Sunday
1 daily flight
Monday
2 daily flights
Tuesday
0 flights
Wednesday
2 daily flights
Thursday
2 daily flights
Friday
1 daily flight
Saturday
1 daily flight
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