$67+ 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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ONT
Mar 5 — Mar 121
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.Cheapflights Tip: The best prices from Chicago O'Hare Intl to Ontario are usually found in April or July, booked 9 days in advance, depart on a Tuesday or Friday and return on a Thursday
Cheap flight deals from O'Hare Intl to Ontario
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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 February 3, 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 February 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 1/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/75:30 am
ORD
- ONT
2 stops20h 29m
Frontier
Mon 3/99:40 pm
ONT
- ORD
1 stop6h 28m
Frontier
Deal found 1/31![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Wed 3/411:51 am
ORD
- ONT
2 stops23h 43m
Frontier
Tue 3/102:23 pm
ONT
- ORD
1 stop13h 45m
Frontier
Deal found 2/1![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/211:33 am
ORD
- ONT
2 stops36h 01m
Frontier
Mon 3/99:40 pm
ONT
- ORD
1 stop6h 28m
Frontier
Deal found 2/2![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Tue 3/36:02 pm
ORD
- ONT
2 stops29h 32m
Frontier
Tue 3/102:23 pm
ONT
- ORD
1 stop13h 45m
Frontier
Deal found 2/1![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Tue 3/107:00 am
ORD
- ONT
2 stops18h 59m
Frontier
Wed 3/112:23 pm
ONT
- ORD
1 stop13h 45m
Frontier
Deal found 2/1![Frontier logo]()
$186
This Trip.com deal was found by Cheapflights users on 2/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/98:30 am
ORD
- ONT
1 stop12h 15m
Frontier
Mon 4/1311:10 am
ONT
- ORD
1 stop17h 37m
Frontier
Deal found 2/1![Frontier logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/411:51 am
ORD
- ONT
2 stops23h 43m
Frontier
Wed 3/112:23 pm
ONT
- ORD
1 stop13h 45m
Frontier
Deal found 2/2![Frontier logo]()
$189
This Frontier deal was found by Cheapflights users on 2/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:50 pm
ORD
- ONT
1 stop9h 17m
Frontier
Wed 4/157:29 pm
ONT
- ORD
1 stop9h 18m
Frontier
Deal found 2/3![Frontier logo]()
$190
This Frontier deal was found by Cheapflights users on 2/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/69:18 pm
ORD
- ONT
1 stop12h 46m
Frontier
Sat 5/97:18 pm
ONT
- ORD
1 stop9h 29m
Frontier
Deal found 2/2![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 2/218:05 am
ORD
- ONT
2 stops17h 54m
Frontier
Thu 2/267:22 pm
ONT
- ORD
1 stop20h 04m
Frontier
Deal found 2/1![Frontier logo]()
$192
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Mon 3/23:40 pm
ORD
- ONT
2 stops23h 31m
Frontier
Sat 3/76:15 am
ONT
- ORD
1 stop24h 28m
Frontier
Deal found 2/1![Frontier logo]()
$194
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 February 3, 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 February 3, 2026.
This Alaska Airlines deal was found by Cheapflights users on 2/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/253:54 pm
ORD
- ONT
1 stop8h 50m
Alaska Airlines
Wed 3/412:02 pm
ONT
- ORD
1 stop9h 54m
Alaska Airlines
Deal found 2/1![Alaska Airlines logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 2/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/247:00 am
ORD
- ONT
1 stop10h 08m
Alaska Airlines
Wed 3/187:08 pm
ONT
- ORD
1 stop9h 31m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$260
This Alaska Airlines deal was found by Cheapflights users on 2/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/247:00 am
ORD
- ONT
1 stop10h 08m
Alaska Airlines
Sat 3/1412:02 pm
ONT
- ORD
1 stop9h 54m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$260
This Alaska Airlines deal was found by Cheapflights users on 2/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/145:29 pm
ORD
- ONT
1 stop8h 03m
Alaska Airlines
Wed 3/187:08 pm
ONT
- ORD
1 stop9h 31m
Alaska Airlines
Deal found 2/1![Alaska Airlines logo]()
$283
This Alaska Airlines deal was found by Cheapflights users on 2/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/47:00 am
ORD
- ONT
1 stop10h 08m
Alaska Airlines
Wed 3/1112:02 pm
ONT
- ORD
1 stop9h 54m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$283
This Alaska Airlines deal was found by Cheapflights users on 1/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/287:00 am
ORD
- ONT
1 stop10h 08m
Alaska Airlines
Sat 3/1412:02 pm
ONT
- ORD
1 stop9h 54m
Alaska Airlines
Deal found 1/31![Alaska Airlines logo]()
$283
This Alaska Airlines deal was found by Cheapflights users on 2/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/47:00 am
ORD
- ONT
1 stop10h 08m
Alaska Airlines
Tue 3/106:14 am
ONT
- ORD
1 stop8h 19m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$283
This Alaska Airlines deal was found by Cheapflights users on 2/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/25:29 pm
ORD
- ONT
1 stop8h 03m
Alaska Airlines
Wed 3/1112:02 pm
ONT
- ORD
1 stop9h 54m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$293
This Alaska Airlines deal was found by Cheapflights users on 2/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/63:54 pm
ORD
- ONT
1 stop9h 38m
Alaska Airlines
Wed 3/116:14 am
ONT
- ORD
1 stop8h 19m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$293
This Alaska Airlines deal was found by Cheapflights users on 2/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/23:54 pm
ORD
- ONT
1 stop9h 38m
Alaska Airlines
Sat 3/1412:02 pm
ONT
- ORD
1 stop9h 54m
Alaska Airlines
Deal found 2/1![Alaska Airlines logo]()
$293
This Alaska Airlines deal was found by Cheapflights users on 2/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/63:54 pm
ORD
- ONT
1 stop9h 38m
Alaska Airlines
Tue 3/1012:02 pm
ONT
- ORD
1 stop9h 54m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$293
This Alaska Airlines deal was found by Cheapflights users on 2/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/63:54 pm
ORD
- ONT
1 stop9h 38m
Alaska Airlines
Sat 3/1412:02 pm
ONT
- ORD
1 stop9h 54m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$293
Last-minute flights from O'Hare Intl to OntarioDiscover last-minute flight deals from O'Hare Intl to Ontario. Data last updated February 3, 2026 and is based on user searches.
Discover last-minute flight deals from O'Hare Intl to Ontario. Data last updated February 3, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 2/218:05 am
ORD
- ONT
2 stops17h 54m
Frontier
Thu 2/267:22 pm
ONT
- ORD
1 stop20h 04m
Frontier
Deal found 2/1![Frontier logo]()
$192
This Frontier deal was found by Cheapflights users on 2/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/264:16 pm
ORD
- ONT
1 stop9h 43m
Frontier
Sat 2/288:21 am
ONT
- ORD
1 stop12h 56m
Frontier
Deal found 2/2![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/211:33 am
ORD
- ONT
2 stops36h 01m
Frontier
Mon 3/99:40 pm
ONT
- ORD
1 stop6h 28m
Frontier
Deal found 2/2![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Mon 3/23:40 pm
ORD
- ONT
2 stops23h 31m
Frontier
Sat 3/76:15 am
ONT
- ORD
1 stop24h 28m
Frontier
Deal found 2/1![Frontier logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Tue 3/36:02 pm
ORD
- ONT
2 stops29h 32m
Frontier
Tue 3/102:23 pm
ONT
- ORD
1 stop13h 45m
Frontier
Deal found 2/1![Frontier logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Wed 3/411:51 am
ORD
- ONT
2 stops23h 43m
Frontier
Tue 3/102:23 pm
ONT
- ORD
1 stop13h 45m
Frontier
Deal found 2/1![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/411:51 am
ORD
- ONT
2 stops23h 43m
Frontier
Wed 3/112:23 pm
ONT
- ORD
1 stop13h 45m
Frontier
Deal found 2/2![Frontier logo]()
$189
This Kiwi.com deal was found by Cheapflights users on 1/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/75:30 am
ORD
- ONT
2 stops20h 29m
Frontier
Mon 3/99:40 pm
ONT
- ORD
1 stop6h 28m
Frontier
Deal found 1/31![Frontier logo]()
$145
This Mytrip deal was found by Cheapflights users on 2/2. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/96:20 pm
ORD
- ONT
1 stop7h 39m
Frontier
Wed 3/1110:03 pm
ONT
- ORD
1 stop6h 05m
Frontier
Deal found 2/2![Frontier logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Tue 3/107:00 am
ORD
- ONT
2 stops18h 59m
Frontier
Wed 3/112:23 pm
ONT
- ORD
1 stop13h 45m
Frontier
Deal found 2/1![Frontier logo]()
$186
This Mytrip deal was found by Cheapflights users on 2/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/118:55 pm
ORD
- ONT
1 stop18h 16m
Frontier
Wed 3/256:15 am
ONT
- ORD
1 stop25h 28m
Frontier
Deal found 2/1![Frontier logo]()
$202
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 February 3, 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 February 3, 2026.
This Trip.com deal was found by Cheapflights users on 2/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/118:55 pm
ORD
- ONT
1 stop18h 16m
Frontier
Deal found 2/1![Frontier logo]()
$67
This Trip.com deal was found by Cheapflights users on 2/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/269:18 pm
ORD
- ONT
1 stop24h 46m
Frontier
Deal found 2/3![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Tue 4/149:18 pm
ORD
- ONT
1 stop18h 22m
Frontier
Deal found 2/1![Frontier logo]()
$75
This Trip.com deal was found by Cheapflights users on 2/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/39:18 pm
ORD
- ONT
1 stop12h 46m
Frontier
Deal found 2/3![Frontier logo]()
$79
This Trip.com deal was found by Cheapflights users on 2/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/167:19 pm
ORD
- ONT
1 stop19h 52m
Frontier
Deal found 2/1![Frontier logo]()
$83
This Trip.com deal was found by Cheapflights users on 2/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/96:20 pm
ORD
- ONT
1 stop7h 39m
Frontier
Deal found 2/3![Frontier logo]()
$85
This Trip.com deal was found by Cheapflights users on 2/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2512:35 pm
ORD
- ONT
1 stop10h 28m
Frontier
Deal found 2/1![Frontier logo]()
$89
This Trip.com deal was found by Cheapflights users on 2/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/83:29 pm
ORD
- ONT
1 stop10h 27m
Frontier
Deal found 2/3![Frontier logo]()
$90
This Trip.com deal was found by Cheapflights users on 2/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/89:08 pm
ORD
- ONT
1 stop20h 29m
Frontier
Deal found 2/1![Frontier logo]()
$91
This Super.com deal was found by Cheapflights users on 2/1. 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.
Sat 4/184:55 pm
ORD
- ONT
1 stop7h 47m
Frontier
Deal found 2/1![Frontier logo]()
$94
This Expedia deal was found by Cheapflights users on 2/3. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/24:55 pm
ORD
- ONT
1 stop7h 47m
Frontier
Deal found 2/3![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 2/2. 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.
Tue 3/178:55 pm
ORD
- ONT
1 stop26h 08m
Frontier
Deal found 2/2![Frontier logo]()
$99
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 February 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $145 (Kiwi.com) |
One-way from | $67 (Trip.com) |
Popular in | September |
Cheapest in | April |
Average price | $299 |
Good round-trip deal | $542 or less |
Good one-way deal | $300 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 February 3, 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
O'Hare Intl
Fly to
Ontario
Route
Depart
Return
Price
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Wed 2/25
3:54 pm-10:44 pm
1 stop8h 50m
Ontario
Wed 3/4
12:02 pm-11:56 pm
1 stop9h 54m
$257
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Tue 2/24
7:00 am-3:08 pm
1 stop10h 08m
Ontario
Wed 3/18
7:08 pm-6:39 am
1 stop9h 31m
$260
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Tue 2/24
7:00 am-3:08 pm
1 stop10h 08m
Ontario
Sat 3/14
12:02 pm-11:56 pm
1 stop9h 54m
$260
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Sat 3/14
5:29 pm-11:32 pm
1 stop8h 03m
Ontario
Wed 3/18
7:08 pm-6:39 am
1 stop9h 31m
$283
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Wed 3/4
7:00 am-3:08 pm
1 stop10h 08m
Ontario
Wed 3/11
12:02 pm-11:56 pm
1 stop9h 54m
$283
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Sat 2/28
7:00 am-3:08 pm
1 stop10h 08m
Ontario
Sat 3/14
12:02 pm-11:56 pm
1 stop9h 54m
$283
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Wed 3/4
7:00 am-3:08 pm
1 stop10h 08m
Ontario
Tue 3/10
6:14 am-4:33 pm
1 stop8h 19m
$283
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Mon 3/2
5:29 pm-11:32 pm
1 stop8h 03m
Ontario
Wed 3/11
12:02 pm-11:56 pm
1 stop9h 54m
$293
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Fri 3/6
3:54 pm-11:32 pm
1 stop9h 38m
Ontario
Wed 3/11
6:14 am-4:33 pm
1 stop8h 19m
$293
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Mon 3/2
3:54 pm-11:32 pm
1 stop9h 38m
Ontario
Sat 3/14
12:02 pm-11:56 pm
1 stop9h 54m
$293
Showing 1-10 of 23 results
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 February.
| 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 Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- 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
How far ahead should I book a flight from Chicago O'Hare Intl Airport to Ontario?
Use this chart to determine the optimal time to book a round-trip flight from O'Hare Intl to Ontario. Price data was last updated on January 30, 2026.
The price you pay for your flight from Chicago O'Hare Intl Airport to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 9 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Chicago O'Hare Intl Airport to Ontario?
Currently, September is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $80). Flying from Chicago O'Hare Intl Airport to Ontario in January is currently the most expensive (average of $135). 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’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 67% 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 February 3, 2026.
See what other customers who have flown with Southwest, Delta, and United 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.
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Crew
8.6
Overall
8.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Related info for your journey
Find useful and relevant information for your journey from O'Hare Intl to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from O'Hare Intl to Ontario by cabin class
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 February 3, 2026.
O'Hare Intl and Ontario flights
Browse other O'Hare Intl and Ontario flight options. Last updated on February 3, 2026.
Other flights from O'Hare Intl
Browse through other flights departing from O'Hare Intl. Flights are based on user searches made on Cheapflights and were last updated on February 3, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 5 airlines flying from O'Hare Intl to Ontario
Discover the top 5 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 February 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$123 | Average$208 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$231 | Average$463 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$237 | Average$442 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$246 | Average$484 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$256 | Average$256 | FlexibilityNo cancel fee | On-timeN/A |