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Latest Flight Deals from Chicago to Ontario

Book one-way or return flights from Chicago to Ontario from as little as NZD 72. Choose from the popular airlines below and book your flight today!

  • One way
  • Round-trip
      • MDW22:55
        9h 31m
        1 stop
        ONT06:26
        Tue, May 7|Chicago - Ontario|Frontier Airlines
        NZD 72NZD 113
        37% OFF
        37% OFF
        NZD 113NZD 72
      • ORD17:56
        8h 3m
        1 stop
        ONT23:59
        Sat, May 18|Chicago - Ontario|Frontier Airlines
        NZD 72NZD 113
        36% OFF
        36% OFF
        NZD 113NZD 72
      • ORD18:27
        7h 32m
        1 stop
        ONT23:59
        Wed, May 8|Chicago - Ontario|Frontier Airlines
        NZD 73NZD 113
        35% OFF
        35% OFF
        NZD 113NZD 73
      • ORD18:27
        13h 59m
        1 stop
        ONT06:26
        Tue, Apr 30|Chicago - Ontario|Frontier Airlines
        NZD 73
        NZD 73
      • ORD18:27
        7h 32m
        1 stop
        ONT23:59
        Wed, May 1|Chicago - Ontario|Frontier Airlines
        NZD 74
        NZD 74
      • ORD18:27
        7h 32m
        1 stop
        ONT23:59
        Sat, May 4|Chicago - Ontario|Frontier Airlines
        NZD 74
        NZD 74
      • ORD18:27
        13h 59m
        1 stop
        ONT06:26
        Tue, May 14|Chicago - Ontario|Frontier Airlines
        NZD 77
        NZD 77
      • MDW09:11
        9h 49m
        1 stop
        ONT17:00
        Thu, May 2|Chicago - Ontario|Frontier Airlines
        NZD 79
        NZD 79
      • MDW21:10
        13h 54m
        1 stop
        ONT09:04
        Tue, May 21|Chicago - Ontario|Frontier Airlines
        NZD 81
        NZD 81
      • MDW21:10
        17h 44m
        1 stop
        ONT12:54
        Mon, May 20|Chicago - Ontario|Frontier Airlines
        NZD 81
        NZD 81
      • CHI13:00
        3h 5m
        Direct
        ONT14:00
        Tue, May 7|Chicago - Ontario|Frontier Airlines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Searching for the best last minute flight from Chicago to Ontario? Find one-way or return flights that are affordable and fit your itinerary.

Trip.com monitors the ticket fares of flights from Chicago to Ontario. Stay updated on price trends and snag the best deals for your upcoming trip.

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
Airlines Flying from Chicago to Ontario

View airlines operating flights from Chicago to Ontario. Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Frontier Airlines
From NZD 72
Spirit Airlines
From NZD 92
American Airlines
From NZD 146
Alaska Airlines
From NZD 168
Sun Country Airlines
From NZD 174
Delta Air Lines
From NZD 176
Allegiant Air
From NZD 179
United Airlines
From NZD 186
Southwest Airlines
From NZD 215
Jetblue Airways
From NZD 672
ANA airlines

Find more flights and airlines

Alternative Routes from Chicago to Ontario

Discover different routes, airlines, and transfers and find the best alternative flights for your journey from Chicago to Ontario.

  • Cheapest
    Frontier Airlines
    ORD
    18:27
    7h 32m
    1 transfer
    ONT
    23:59
    O'Hare International Airport - Ontario International Airport
    Tue, May 7Frontier Airlines
    NZD 72
  • Frontier Airlines
    MDW
    22:55
    9h 31m
    1 transfer
    ONT
    06:26
    Midway International Airport - Ontario International Airport
    Tue, May 7Frontier Airlines
    NZD 72
  • Allegiant Air
    RFD
    21:54
    21h 5m
    1 transfer
    ONT
    16:59
    Chicago Rockford International Airport - Ontario International Airport
    Fri, May 3Allegiant Air
    NZD 179
  • Allegiant Air
    RFD
    21:54
    21h 5m
    1 transfer
    ONT
    16:59
    Chicago Rockford International Airport - Ontario International Airport
    Fri, May 3Allegiant Air
    NZD 179
    Find More Flights

How do I find the cheapest flights?

  • When are flight tickets from Chicago (CHI) to Ontario (ONT) the cheapest?

    Airlines adjust prices for flights from Chicago to Ontario based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.

  • How much do flights from Chicago (CHI) to Ontario (ONT) cost?

    According to Trip.com's data, the lowest price is around NZD 437.

How to find a cheap flight from Chicago to Ontario

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Chicago to Ontario. Book your flights at the right time and save more.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com
Flight Information from Chicago to Ontario

Cheapest nonstop flight price

NZD 71

Cheapest round-trip ticket price

NZD 146

Off-season for travel

September

Peak season for travel

November

Flight distance

9,812.12km

Popular airline

United Airlines

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