$89+ Cheap flights from O'Hare Intl (ORD) to Ontario (ONT)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ONT
Sep 5 — Sep 121
Round-trip
1 adult, Economy
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Find cheap flights from O'Hare Intl to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from O'Hare Intl to Ontario
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Last-minute
One-way
Cheapest flights from O'Hare Intl to OntarioExplore the most affordable flight options available from O'Hare Intl to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 6, 2026.
Explore the most affordable flight options available from O'Hare Intl to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 6, 2026.
This eDestinos deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:45 am -
1 stop12h 16m
Sat 9/57:56 pm -
1 stop15h 40m
Deal found 8/2![Frontier logo]()
$172
This Frontier deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:41 pm -
1 stop11h 09m
Tue 8/259:37 am -
1 stop8h 38m
Deal found 8/5![Frontier logo]()
$178
This CheapOair deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/218:55 pm -
1 stop22h 04m
Mon 9/282:30 pm -
1 stop13h 08m
Deal found 8/5![Frontier logo]()
$188
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:30 am -
1 stop6h 00m
Mon 9/218:24 pm -
1 stop7h 14m
Deal found 8/1![Frontier logo]()
$190
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/279:10 pm -
1 stop13h 28m
Sat 9/57:56 pm -
1 stop15h 40m
Deal found 8/1![Frontier logo]()
$191
This Travelocity deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/12:41 pm -
1 stop11h 09m
Mon 9/710:17 pm -
1 stop18h 04m
Deal found 8/4![Frontier logo]()
$193
This Frontier deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/136:30 am -
1 stop6h 00m
Mon 9/218:24 pm -
1 stop7h 14m
Deal found 8/5![Frontier logo]()
$194
This Booking.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:11 pm -
1 stop21h 43m
Tue 9/19:37 am -
1 stop8h 38m
Deal found 8/1![Frontier logo]()
$196
This Frontier deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:41 pm -
1 stop11h 09m
Sun 8/239:33 am -
1 stop13h 16m
Deal found 8/5![Frontier logo]()
$198
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/52:41 pm -
1 stop11h 09m
Fri 9/1111:45 am -
1 stop10h 38m
Deal found 8/1![Frontier logo]()
$200
Best flights from O'Hare Intl to OntarioDiscover carefully curated flight deals from O'Hare Intl to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 6, 2026.
Discover carefully curated flight deals from O'Hare Intl to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 6, 2026.
This United Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/103:35 pm -
1 stop9h 16m
Mon 10/127:00 am -
Nonstop4h 10m
Deal found 8/1![United Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:44 pm -
1 stop5h 50m
Thu 8/271:06 pm -
1 stop6h 27m
Deal found 8/5![Delta logo]()
$293
This United Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/218:06 pm -
Nonstop4h 29m
Mon 8/241:56 pm -
1 stop7h 03m
Deal found 8/5![United Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/283:25 pm -
2 stops10h 09m
Sat 8/2912:00 pm -
1 stop9h 57m
Deal found 8/2![Delta logo]()
$341
This United Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/248:20 pm -
Nonstop4h 29m
Wed 9/307:00 am -
Nonstop4h 10m
Deal found 8/4![United Airlines logo]()
$350
This United Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/274:20 pm -
1 stop6h 33m
Sat 9/57:00 am -
Nonstop4h 10m
Deal found 8/1![United Airlines logo]()
$366
This United Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/178:20 pm -
Nonstop4h 29m
Sat 10/247:00 am -
Nonstop4h 10m
Deal found 8/5![United Airlines logo]()
$369
This United Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/165:55 am -
1 stop8h 55m
Sat 9/197:00 am -
Nonstop4h 10m
Deal found 8/4![United Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/178:20 pm -
Nonstop4h 29m
Mon 10/191:52 pm -
1 stop9h 03m
Deal found 8/3![United Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/258:06 pm -
Nonstop4h 29m
Thu 8/271:18 pm -
1 stop7h 27m
Deal found 8/2![United Airlines logo]()
$379
Last-minute flights from O'Hare Intl to OntarioDiscover last-minute flight deals from O'Hare Intl to Ontario. Data last updated August 6, 2026 and is based on user searches.
Discover last-minute flight deals from O'Hare Intl to Ontario. Data last updated August 6, 2026 and is based on user searches.
This Gotogate deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:11 pm -
1 stop21h 43m
Tue 9/19:37 am -
1 stop8h 38m
Deal found 7/31![Frontier logo]()
$198
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/279:10 pm -
1 stop13h 28m
Sat 9/57:56 pm -
1 stop15h 40m
Deal found 8/1![Frontier logo]()
$191
This Super.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/318:11 pm -
1 stop21h 38m
Mon 9/710:17 pm -
1 stop18h 04m
Deal found 8/3![Frontier logo]()
$201
This eDestinos deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:45 am -
1 stop12h 16m
Sat 9/57:56 pm -
1 stop15h 40m
Deal found 8/2![Frontier logo]()
$172
This Travelocity deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/12:41 pm -
1 stop11h 09m
Mon 9/710:17 pm -
1 stop18h 04m
Deal found 8/4![Frontier logo]()
$193
This Kiwi.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/52:41 pm -
1 stop11h 09m
Fri 9/1111:45 am -
1 stop10h 38m
Deal found 8/1![Frontier logo]()
$200
This Booking.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/58:45 am -
1 stop12h 16m
Mon 9/710:17 pm -
1 stop18h 04m
Deal found 8/4![Frontier logo]()
$202
This Super.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:30 am -
1 stop6h 00m
Mon 9/218:24 pm -
1 stop7h 14m
Deal found 8/5![Frontier logo]()
$188
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:30 am -
1 stop6h 00m
Wed 9/2311:45 am -
1 stop10h 38m
Deal found 8/1![Frontier logo]()
$190
This Booking.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:30 am -
1 stop6h 00m
Sat 9/2610:04 am -
1 stop17h 34m
Deal found 7/31![Frontier logo]()
$196
This Justfly.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/218:55 pm -
1 stop22h 04m
Mon 9/288:24 pm -
1 stop7h 14m
Deal found 8/5![Frontier logo]()
$199
One-way flights from O'Hare Intl to OntarioSearch for one-way flight options from O'Hare Intl to Ontario. Find affordable one-way fares based on user searches. Data last updated August 6, 2026.
Search for one-way flight options from O'Hare Intl to Ontario. Find affordable one-way fares based on user searches. Data last updated August 6, 2026.
This Frontier deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:30 am -
1 stop6h 00m
Deal found 8/5![Frontier logo]()
$89
This Super.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/37:00 am -
1 stop7h 02m
Deal found 8/4![Frontier logo]()
$93
This Super.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/101:01 pm -
1 stop7h 38m
Deal found 8/1![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:30 am -
1 stop6h 00m
Deal found 8/1![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/136:50 am -
1 stop11h 20m
Deal found 8/4![Frontier logo]()
$98
This Super.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/275:46 pm -
1 stop15h 46m
Deal found 8/2![Frontier logo]()
$99
This Super.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/218:55 pm -
1 stop22h 04m
Deal found 8/4![Frontier logo]()
$100
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/298:45 am -
1 stop12h 16m
Deal found 8/1![Frontier logo]()
$101
This Super.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/238:11 pm -
1 stop27h 16m
Deal found 8/5![Frontier logo]()
$103
This Frontier deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/119:34 pm -
1 stop13h 07m
Deal found 8/5![Frontier logo]()
$105
Find flight deals from O'Hare Intl to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from O'Hare Intl (ORD) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 6, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $172 (eDestinos) |
One-way from | $89 (Frontier) |
Popular in | December |
Cheapest in | May |
Average price | $453 |
Good round-trip deal | $288 or less |
Good one-way deal | $238 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from O'Hare Intl to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 6, 2026.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Sat 10/10
3:35 pm-10:51 pm
1 stop9h 16m
Ontario
Mon 10/12
7:00 am-1:10 pm
Nonstop4h 10m
$279
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Fri 8/21
8:06 pm-10:35 pm
Nonstop4h 29m
Ontario
Mon 8/24
1:56 pm-10:59 pm
1 stop7h 03m
$287
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Thu 8/20
7:44 pm-11:34 pm
1 stop5h 50m
Ontario
Thu 8/27
1:06 pm-9:33 pm
1 stop6h 27m
$293
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Fri 8/28
3:25 pm-11:34 pm
2 stops10h 09m
Ontario
Sat 8/29
12:00 pm-11:57 pm
1 stop9h 57m
$341
Quickest round-trip
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Thu 9/24
8:20 pm-10:49 pm
Nonstop4h 29m
Ontario
Wed 9/30
7:00 am-1:10 pm
Nonstop4h 10m
$350
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Thu 8/27
4:20 pm-8:53 pm
1 stop6h 33m
Ontario
Sat 9/5
7:00 am-1:10 pm
Nonstop4h 10m
$366
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Sat 10/17
8:20 pm-10:49 pm
Nonstop4h 29m
Ontario
Sat 10/24
7:00 am-1:10 pm
Nonstop4h 10m
$369
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Wed 9/16
5:55 am-12:50 pm
1 stop8h 55m
Ontario
Sat 9/19
7:00 am-1:10 pm
Nonstop4h 10m
$379
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Sat 10/17
8:20 pm-10:49 pm
Nonstop4h 29m
Ontario
Mon 10/19
1:52 pm-12:55 am
1 stop9h 03m
$379
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Tue 8/25
8:06 pm-10:35 pm
Nonstop4h 29m
Ontario
Thu 8/27
1:18 pm-10:45 pm
1 stop7h 27m
$379
Showing 1-10 of 19 resultsSorted by cheapest first
Compare providers for flights from O'Hare Intl to Ontario
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from O'Hare Intl to Ontario in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Chicago O'Hare Intl Airport-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Chicago O'Hare Intl Airport-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Chicago O'Hare Intl Airport-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Chicago O'Hare Intl Airport-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago O'Hare Intl Airport-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from O'Hare Intl to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from O'Hare Intl with our price prediction graph.
ORD-ONT
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Chicago O'Hare Intl Airport to Ontario
Prices
More
What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to Ontario?
Currently, May is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $390). Flying from Chicago O'Hare Intl Airport to Ontario in December is currently the most expensive (average of $550). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ORD to ONT?
Find hourly flight availability from O'Hare Intl to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 6, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Chicago O'Hare Intl Airport to Ontario as you normally would.
What’s the top layover airport for flights from Chicago O'Hare Intl Airport to Ontario?
Share of 1-stop round-trip flights from Chicago O'Hare Intl Airport to Ontario chosen by Cheapflights users in the past 12 months, using the same layover each way.
Phoenix (PHX) – chosen by Cheapflights users on 50% of 1-stop itineraries from Chicago O'Hare Intl Airport to Ontario on Cheapflights.
What’s the cheapest layover airport for flights from Chicago O'Hare Intl Airport to Ontario?
Average round-trip fare for 1-stop flights from Chicago O'Hare Intl Airport to Ontario, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $183.
What’s the fastest layover option from Chicago O'Hare Intl Airport to Ontario?
Shortest average travel time for 1-stop one-way flights from Chicago O'Hare Intl Airport to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Phoenix (PHX) have the shortest average one-way travel time for 1-stop routes: 6h 23m.
Which airport typically offers the quickest layover for flights from Chicago O'Hare Intl Airport to Ontario?
Average layover duration for 1-stop one-way flights from Chicago O'Hare Intl Airport to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Phoenix (PHX) offer the fastest connection on this route, with an average layover time of 1h 01m.
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated August 6, 2026.
See what other customers who have flown with Delta,United Airlines, andAmerican Airlines from Chicago O'Hare Intl Airport to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.8
Entertainment
7.8
Food
7.2
Comfort
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Overall
7.8
Entertainment
7.8
Food
7.2
Comfort
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Overall
7.8
Entertainment
7.8
Food
7.2
Comfort
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Overall
7.8
Entertainment
7.8
Food
7.2
Comfort
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Overall
7.8
Entertainment
7.8
Food
7.2
Comfort
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
TUS - LAX
Related info for your journey
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Find flights from O'Hare Intl to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 6, 2026.
O'Hare Intl and Ontario flights
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Other flights from O'Hare Intl
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Top 4 airlines flying from O'Hare Intl to Ontario
Discover the top 4 airlines that operate flights from O'Hare Intl to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$167 | Average$265 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$385 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$307 | Average$488 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$307 | Average$531 | FlexibilityNo cancel fee | On-time71% |