$116+ Cheap flights from O'Hare Intl (ORD) to Ontario (ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ONT
Dec 4 — Dec 111
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.Cheapflights Tip: The best prices from Chicago O'Hare Intl to Ontario are usually found in January or October, booked 46 days in advance, depart on a Wednesday or Thursday and return on a Saturday
Cheap flight deals from O'Hare Intl to Ontario
Cheapest
Best
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 November 4, 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 November 4, 2026.
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
1 stop17h 20m
Sat 12/56:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$145
This Trip.com deal was found by Cheapflights users on 11/3. 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.
Sat 12/57:25 am -
1 stop16h 52m
Tue 12/86:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$155
This Cheapflightsfares deal was found by Cheapflights users on 11/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/77:25 am -
1 stop29h 20m
Sat 12/126:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$164
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
1 stop17h 20m
Fri 12/46:00 am -
1 stop16h 53m
Deal found 11/3![Frontier logo]()
$172
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/36:21 am -
1 stop13h 50m
Sat 12/56:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$173
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/16:21 am -
1 stop8h 18m
Tue 12/86:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$183
This Trip.com deal was found by Cheapflights users on 11/3. 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 12/27:00 am -
1 stop17h 20m
Mon 12/711:30 am -
1 stop11h 24m
Deal found 11/3![Frontier logo]()
$185
This Cheapflightsfares deal was found by Cheapflights users on 11/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/107:25 am -
1 stop18h 55m
Mon 12/146:00 am -
1 stop16h 54m
Deal found 11/4![Frontier logo]()
$187
This Cheapflightsfares deal was found by Cheapflights users on 11/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/245:15 am -
1 stop28h 05m
Tue 12/86:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$188
This Kiwi.com deal was found by Cheapflights users on 11/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/57:25 am -
1 stop16h 52m
Thu 12/1011:30 am -
1 stop11h 24m
Deal found 11/3![Frontier logo]()
$190
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
1 stop17h 20m
Sun 12/66:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$192
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 November 4, 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 November 4, 2026.
This United Airlines deal was found by Cheapflights users on 10/31. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/74:10 pm -
Nonstop4h 40m
Sat 1/167:00 am -
Nonstop4h 00m
Deal found 10/31![United Airlines logo]()
$239
This Delta deal was found by Cheapflights users on 11/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/47:18 pm -
1 stop6h 39m
Thu 12/1011:08 pm -
1 stop7h 41m
Deal found 11/3![Delta logo]()
$259
This Delta deal was found by Cheapflights users on 11/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/45:30 am -
1 stop7h 37m
Mon 12/71:11 pm -
1 stop6h 45m
Deal found 11/3![Delta logo]()
$259
This Delta deal was found by Cheapflights users on 11/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:18 pm -
1 stop6h 39m
Thu 12/2411:14 am -
1 stop9h 53m
Deal found 11/1![Delta logo]()
$279
This United Airlines deal was found by Cheapflights users on 11/1. 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 12/310:25 am -
1 stop9h 11m
Thu 12/107:00 am -
Nonstop4h 11m
Deal found 11/1![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 10/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/195:30 am -
1 stop7h 33m
Mon 11/235:56 pm -
2 stops13h 08m
Deal found 10/31![Delta logo]()
$344
This United Airlines deal was found by Cheapflights users on 10/30. 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 1/214:10 pm -
Nonstop4h 40m
Sun 1/247:00 am -
Nonstop4h 00m
Deal found 10/30![United Airlines logo]()
$398
This Delta deal was found by Cheapflights users on 11/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1412:38 pm -
2 stops12h 22m
Mon 11/1611:10 pm -
2 stops12h 49m
Deal found 11/3![Delta logo]()
$347
This United Airlines deal was found by Cheapflights users on 11/3. 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.
Sun 12/137:00 am -
1 stop7h 34m
Wed 12/167:00 am -
Nonstop4h 11m
Deal found 11/3![United Airlines logo]()
$408
This United Airlines deal was found by Cheapflights users on 10/30. 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 12/44:15 pm -
Nonstop4h 29m
Sun 12/65:00 am -
1 stop6h 15m
Deal found 10/30![United Airlines logo]()
$408
This United Airlines deal was found by Cheapflights users on 11/3. 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.
Tue 11/242:30 pm -
1 stop7h 45m
Wed 12/21:40 pm -
1 stop8h 19m
Deal found 11/3![United Airlines logo]()
$418
Last-minute flights from O'Hare Intl to OntarioDiscover last-minute flight deals from O'Hare Intl to Ontario. Data last updated November 4, 2026 and is based on user searches.
Discover last-minute flight deals from O'Hare Intl to Ontario. Data last updated November 4, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 11/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/245:15 am -
1 stop28h 05m
Tue 12/86:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$188
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/16:21 am -
1 stop8h 18m
Tue 12/86:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$183
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
1 stop17h 20m
Sat 12/56:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$145
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
1 stop17h 20m
Fri 12/46:00 am -
1 stop16h 53m
Deal found 11/3![Frontier logo]()
$172
This Trip.com deal was found by Cheapflights users on 11/3. 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 12/27:00 am -
1 stop17h 20m
Mon 12/711:30 am -
1 stop11h 24m
Deal found 11/3![Frontier logo]()
$185
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
1 stop17h 20m
Sun 12/66:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$192
This CheapOair deal was found by Cheapflights users on 11/3. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/36:21 am -
1 stop13h 50m
Sat 12/56:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$173
This Trip.com deal was found by Cheapflights users on 11/3. 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.
Sat 12/57:25 am -
1 stop16h 52m
Tue 12/86:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 11/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/57:25 am -
1 stop16h 52m
Thu 12/1011:30 am -
1 stop11h 24m
Deal found 11/3![Frontier logo]()
$190
This Cheapflightsfares deal was found by Cheapflights users on 11/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/77:25 am -
1 stop29h 20m
Sat 12/126:00 am -
1 stop16h 54m
Deal found 11/3![Frontier logo]()
$164
This Cheapflightsfares deal was found by Cheapflights users on 11/4. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/107:25 am -
1 stop18h 55m
Mon 12/146:00 am -
1 stop16h 54m
Deal found 11/4![Frontier logo]()
$187
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 November 4, 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 November 4, 2026.
This SmartFares deal was found by Cheapflights users on 11/1. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/208:00 am -
1 stop9h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Alaska Airlines logo]()
$116
This Super.com deal was found by Cheapflights users on 11/2. 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 11/108:59 am -
1 stop9h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![Frontier logo]()
$117
This Super.com deal was found by Cheapflights users on 11/3. 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.
Sat 11/76:30 am -
1 stop6h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![Frontier logo]()
$118
This Gotogate deal was found by Cheapflights users on 11/1. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/86:30 am -
1 stop6h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Frontier logo]()
$119
This Mytrip deal was found by Cheapflights users on 11/1. 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.
Sat 12/57:25 am -
2 stops17h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Frontier logo]()
$120
This Super.com deal was found by Cheapflights users on 11/1. 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.
Wed 11/255:15 am -
1 stop16h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Frontier logo]()
$121
This Jetabroad deal was found by Cheapflights users on 11/3. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1410:29 am -
1 stop8h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/3![Frontier logo]()
$122
This Super.com deal was found by Cheapflights users on 11/1. 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 11/126:30 am -
1 stop19h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Frontier logo]()
$123
This iWofly deal was found by Cheapflights users on 11/1. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/165:15 pm -
1 stop25h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Frontier logo]()
$124
This Frontier deal was found by Cheapflights users on 11/1. 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.
Sun 12/138:53 pm -
1 stop12h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/1![Frontier logo]()
$125
This Super.com deal was found by Cheapflights users on 11/2. 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 11/265:15 am -
1 stop9h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![Frontier logo]()
$126
This Mytrip deal was found by Cheapflights users on 11/2. 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.
Tue 12/1510:00 am -
2 stops14h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/2![Frontier logo]()
$127
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 November 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $145 (CheapOair) |
One-way from | $116 (SmartFares) |
Popular in | December |
Cheapest in | January |
Average price | $440 |
Good round-trip deal | $327 or less |
Good one-way deal | $148 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 7,457,451 searches. Data last updated November 4, 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
Wed 12/16
7:18 pm-11:57 pm
1 stop6h 39m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$130
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Sun 11/8
6:20 am-5:12 pm
2 stops12h 52m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$179
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Wed 11/11
7:30 am-5:16 pm
2 stops11h 46m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$179
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Thu 11/19
2:03 pm-11:00 pm
2 stops10h 57m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$195
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Fri 11/20
7:30 am-5:16 pm
2 stops11h 46m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$195
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Sun 11/15
7:00 am-3:13 pm
1 stop10h 13m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$214
Quickest round-trip
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Tue 11/17
4:15 pm-6:47 pm
Nonstop4h 32m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$219
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Sun 12/20
5:00 am-8:45 am
1 stop5h 45m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$229
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Fri 1/1
7:52 pm-10:31 pm
Nonstop4h 39m
Ontario
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$230
ChicagoOntario
ORD Chicago O'Hare Intl - ONT Ontario
ORDONT
Chicago O'Hare Intl
Thu 1/7
4:10 pm-6:50 pm
Nonstop4h 40m
Ontario
Sat 1/16
7:00 am-1:00 pm
Nonstop4h 00m
$239
Showing 1-10 of 22 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 November.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 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
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How far ahead should I book a flight from Chicago O'Hare Intl Airport to Ontario?
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 44 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, January is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $316). Flying from Chicago O'Hare Intl Airport to Ontario in December is currently the most expensive (average of $576). 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 November 4, 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 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.
Phoenix (PHX) is the most affordable 1-stop option, with an average round-trip price of $472.
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 November 4, 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.
Boarding
8.1
Comfort
7.8
Overall
7.8
Entertainment
7.8
Crew
8.5
Food
7.2
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Boarding
8.1
Comfort
7.8
Overall
7.8
Entertainment
7.8
Crew
8.5
Food
7.2
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Boarding
8.1
Comfort
7.8
Overall
7.8
Entertainment
7.8
Crew
8.5
Food
7.2
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Boarding
8.1
Comfort
7.8
Overall
7.8
Entertainment
7.8
Crew
8.5
Food
7.2
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Boarding
8.1
Comfort
7.8
Overall
7.8
Entertainment
7.8
Crew
8.5
Food
7.2
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
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 November 4, 2026.
O'Hare Intl and Ontario flights
Browse other O'Hare Intl and Ontario flight options. Last updated on November 4, 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 November 4, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 7,457,451 searches. Data last updated November 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$188 | Average$284 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$359 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$260 | Average$468 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$276 | Average$446 | FlexibilityNo cancel fee | On-time71% |