Price observed over the last 3 months for a round trip.
Compare all flight tickets and find cheap flights from Chicago to Ontario
The cheapest flights right now
Chicago – Ontario
Outbound – Dec 4, 2026
direct
4h 20m Return – Dec 12, 2026
direct
3h 45m $299
yesterday
Chicago – Ontario
Outbound – Dec 4, 2026
direct
4h 41m Return – Dec 12, 2026
direct
4h 2m $277
yesterday
Chicago – Ontario
Outbound – Dec 4, 2026
direct
4h 45m Return – Dec 12, 2026
direct
4h 2m $273
yesterday
* Prices are in USD per passenger, including taxes, for a round trip. Prices are based on searches carried out within the last 72 hours. Please note that availability and ticket prices are subject to change and should not be considered as the final price quoted.
Cheapest flight tickets
$130
Average price of a round trip
$250
Average flight ticket price recorded over the last 3 months for a round trip.
Flight duration
4h17
A flight from Chicago to Ontario takes on average 4h17.
Best time
March
According to user searches, the ideal month to go to Ontario is March.
What is the cheapest month for this flight?
Monthly price data (Table View)
October
Oct
$121
November
Nov
$177
December
Dec
$136
January
Jan
February
Feb
March
Mar
April
Apr
$136
May
May
$256
June
Jun
$192
July
Jul
$312
August
Aug
$0
September
Sep
$297
* The prices shown are an average per month of the prices found by Liligo users during the last 30 days.
The best flight deals for a week
Chicago – Ontario
Outbound – Dec 4, 2026
direct
4h 20m Return – Dec 12, 2026
direct
3h 45m $299
yesterday
Chicago – Ontario
Outbound – Dec 4, 2026
direct
4h 41m Return – Dec 12, 2026
direct
4h 2m $277
yesterday
Chicago – Ontario
Outbound – Dec 4, 2026
direct
4h 45m Return – Dec 12, 2026
direct
4h 2m $273
yesterday
* Prices are in USD per passenger, including taxes, for a round trip. Prices are based on searches carried out within the last 72 hours. Please note that availability and ticket prices are subject to change and should not be considered as the final price quoted.
Tips for finding a cheap flight from Chicago to Ontario
Check out our tips for booking your flight to Ontario (USA) from Chicago (USA) at the cheapest possible price.
Usually, the cheapest month to pick up a ticket on this route is January, with an average flight ticket price of $90 (calculation over the last two years). The most touristic season corresponds to the months of October, November and January.
For the cheapest flights, it is advisable to buy your ticket at least 7 days before the departure date.
The airline offering the cheapest flight tickets is Frontier Airlines. A ticket from the airline Frontier Airlines to Ontario costs on average $249.
The airlines that offer the most flights are Southwest Airlines and Southwest Airlines.
Price of flight tickets from Chicago to Ontario
Here is some information and tips to know before booking your flight:
- Flight ticket prices range from $130 to $362
- The average price of a flight ticket is about $250
- Prices are lowest for stays in the month of January
- The month in which booking a ticket is cheaper is: October
info departure city :
Chicago, USA
airports :
Chicago-Merrill C. Meigs Field Airport (CGX)
Chicago FSS (CHI)
Chicago-Midway International Airport (MDW)
Chicago-O'Hare International Airport (ORD)
local time :
Chicago is a city in the country USA, the time zone is [[timezone]]. In Chicago, it is currently {fromLocalTime}, the temperature is on average 12°C, with a minimum of 10°C and a maximum of 16°C.
The city of Chicago (CHI) has 4 airport(s): Chicago-Merrill C. Meigs Field, Chicago FSS, Chicago-Midway and Chicago-O'Hare
destination info :
Ontario, USA
airports :
Ontario International Airport (ONT)
Cable Airport (CCB)
Chino Airport (CNO)
Brackett Field (POC)
local time :
Ontario is in the country USA, the time zone is [[timezone]]. In Ontario, it is currently {toLocalTime}, the temperature is on average 28°C, with a minimum of 23°C and a maximum of 33°C.
The city of Ontario has 4 airport(s): Ontario, Cable, Chino and Brackett Field
Useful info about Ontario
What is the least touristic period to go to Ontario?
If you want to visit Ontario during the least touristic period, choose the month of March.
What is the most popular time to travel to Ontario?
In Ontario, the most popular month is October. It is during this period that the prices offered by airlines are also the highest.
When should I book my flight from Chicago to Ontario?
According to our data, it is recommended to book your flight 7 days before your departure. If you book your flight ticket 2 weeks before your departure, you may find a price below average. You can also choose morning flights that are 5% cheaper than afternoon and evening flights. The cheapest day to book a flight from Chicago to Ontario is Wednesday.
What are the arrival and destination airports when traveling between Chicago and Ontario?
When you leave, you can leave from Chicago-Midway or Chicago-O'Hare, and you will arrive at Los Angeles International, Long Beach, Ontario or John Wayne.
How to reach Chicago airport from the city centre?
The airport Chicago-Merrill C. Meigs Field is located 4 km, Chicago FSS is located 29 km, Chicago-Midway is located 12 km or Chicago-O'Hare is located 29 km from the city centre. You can access it by using public transportation, taking a taxi, or renting a car.
Are there other means of transportation to go from Chicago to Ontario?
Airplane is the only means of transportation listed on Liligo for this journey.
Are there big differences in weather between Chicago and Ontario?
In summer, the average temperature is 25°C in Ontario and 22°C in Chicago. The average rainfall in summer is 4 mm in Ontario and 145 mm in Chicago. In summer, it is warmer in Ontario and it rains less in Ontario. In winter, it is colder in Ontario and it rains more in Ontario.
