$101+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ONT
Jul 10 — Jul 171
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
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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 June 10, 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 June 10, 2026.
This Expedia deal was found by Cheapflights users on 6/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/89:57 pm
ORD
- ONT
1 stop14h 07m
Frontier
Tue 7/1410:49 am
ONT
- ORD
1 stop8h 03m
Frontier
Deal found 6/5![Frontier logo]()
$240
This Frontier deal was found by Cheapflights users on 6/5. 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.
Thu 8/69:34 pm
ORD
- ONT
1 stop13h 07m
Frontier
Mon 8/104:34 pm
ONT
- ORD
1 stop11h 03m
Frontier
Deal found 6/5![Frontier logo]()
$242
This Frontier deal was found by Cheapflights users on 6/8. 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 8/69:34 pm
ORD
- ONT
1 stop13h 07m
Frontier
Thu 8/134:34 pm
ONT
- ORD
1 stop11h 03m
Frontier
Deal found 6/8![Frontier logo]()
$244
This CheapOair deal was found by Cheapflights users on 6/5. 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.
Wed 7/299:57 pm
ORD
- ONT
1 stop14h 07m
Frontier
Wed 8/55:08 pm
ONT
- ORD
1 stop10h 29m
Frontier
Deal found 6/5![Frontier logo]()
$250
This CheapOair deal was found by Cheapflights users on 6/5. 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.
Tue 10/610:40 pm
ORD
- ONT
1 stop17h 17m
Frontier
Sat 10/312:35 pm
ONT
- ORD
1 stop30h 00m
Frontier
Deal found 6/5![Frontier logo]()
$251
This CheapOair deal was found by Cheapflights users on 6/10. 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 8/115:30 pm
ORD
- ONT
1 stop16h 02m
Frontier
Sat 8/156:00 am
ONT
- ORD
1 stop12h 52m
Frontier
Deal found 6/10![Frontier logo]()
$252
This Mytrip deal was found by Cheapflights users on 6/8. 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 10/2811:06 am
ORD
- ONT
1 stop14h 49m
Frontier
Sat 10/312:35 pm
ONT
- ORD
1 stop18h 26m
Frontier
Deal found 6/8![Frontier logo]()
$253
This CheapOair deal was found by Cheapflights users on 6/9. 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 8/115:30 pm
ORD
- ONT
1 stop16h 02m
Frontier
Thu 8/134:34 pm
ONT
- ORD
1 stop11h 03m
Frontier
Deal found 6/9![Frontier logo]()
$254
This CheapOair deal was found by Cheapflights users on 6/10. 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.
Fri 8/149:57 pm
ORD
- ONT
1 stop14h 07m
Frontier
Mon 8/179:36 am
ONT
- ORD
1 stop12h 57m
Frontier
Deal found 6/10![Frontier logo]()
$257
This Delta deal was found by Cheapflights users on 6/8. 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.
Tue 6/305:30 am
ORD
- ONT
1 stop7h 10m
Delta
Tue 7/211:00 pm
ONT
- ORD
1 stop6h 29m
Delta
Deal found 6/8![Delta logo]()
$259
This Trip.com deal was found by Cheapflights users on 6/10. 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 8/279:48 pm
ORD
- ONT
1 stop28h 01m
Frontier
Mon 8/315:43 pm
ONT
- ORD
1 stop28h 59m
Frontier
Deal found 6/10![Frontier logo]()
$260
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 June 10, 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 June 10, 2026.
This Delta deal was found by Cheapflights users on 6/8. 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.
Tue 8/252:00 pm
ORD
- ONT
2 stops10h 45m
Delta
Mon 8/316:20 am
ONT
- ORD
2 stops12h 10m
Delta
Deal found 6/8![Delta logo]()
$330
This United Airlines deal was found by Cheapflights users on 6/6. 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 7/118:18 pm
ORD
- ONT
Nonstop4h 33m
United Airlines
Sun 7/191:50 pm
ONT
- ORD
1 stop9h 09m
United Airlines
Deal found 6/6![United Airlines logo]()
$453
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 8/48:20 pm
ORD
- ONT
1 stop16h 54m
Alaska Airlines
Sat 8/84:18 pm
ONT
- ORD
2 stops10h 42m
Alaska Airlines
Deal found 6/10![Alaska Airlines logo]()
$471
This United Airlines deal was found by Cheapflights users on 6/9. 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 6/306:00 am
ORD
- ONT
1 stop8h 47m
United Airlines
Sun 7/56:10 am
ONT
- ORD
Nonstop4h 15m
United Airlines
Deal found 6/9![United Airlines logo]()
$453
This United Airlines deal was found by Cheapflights users on 6/9. 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 7/226:10 am
ORD
- ONT
1 stop8h 02m
United Airlines
Sun 7/266:10 am
ONT
- ORD
Nonstop4h 15m
United Airlines
Deal found 6/9![United Airlines logo]()
$453
This United Airlines deal was found by Cheapflights users on 6/9. 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 7/118:18 pm
ORD
- ONT
Nonstop4h 33m
United Airlines
Tue 7/141:50 pm
ONT
- ORD
1 stop7h 09m
United Airlines
Deal found 6/9![United Airlines logo]()
$453
This United Airlines deal was found by Cheapflights users on 6/6. 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.
Mon 7/68:18 pm
ORD
- ONT
Nonstop4h 33m
United Airlines
Thu 7/91:50 pm
ONT
- ORD
1 stop9h 09m
United Airlines
Deal found 6/6![United Airlines logo]()
$492
This United Airlines deal was found by Cheapflights users on 6/8. 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 7/228:18 pm
ORD
- ONT
Nonstop4h 33m
United Airlines
Tue 7/286:10 am
ONT
- ORD
Nonstop4h 15m
United Airlines
Deal found 6/8![United Airlines logo]()
$507
This United Airlines deal was found by Cheapflights users on 6/6. 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 7/158:18 pm
ORD
- ONT
Nonstop4h 33m
United Airlines
Tue 7/211:50 pm
ONT
- ORD
1 stop9h 09m
United Airlines
Deal found 6/6![United Airlines logo]()
$513
This United Airlines deal was found by Cheapflights users on 6/5. 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 7/258:18 pm
ORD
- ONT
Nonstop4h 33m
United Airlines
Sat 8/16:10 am
ONT
- ORD
Nonstop4h 15m
United Airlines
Deal found 6/5![United Airlines logo]()
$537
This United Airlines deal was found by Cheapflights users on 6/6. 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 8/168:06 pm
ORD
- ONT
Nonstop4h 29m
United Airlines
Wed 8/191:18 pm
ONT
- ORD
1 stop8h 41m
United Airlines
Deal found 6/6![United Airlines logo]()
$537
Last-minute flights from O'Hare Intl to OntarioDiscover last-minute flight deals from O'Hare Intl to Ontario. Data last updated June 10, 2026 and is based on user searches.
Discover last-minute flight deals from O'Hare Intl to Ontario. Data last updated June 10, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 6/8. 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 6/297:20 am
ORD
- ONT
1 stop9h 48m
Frontier
Sat 8/84:34 pm
ONT
- ORD
1 stop11h 03m
Frontier
Deal found 6/8![Frontier logo]()
$276
This Delta deal was found by Cheapflights users on 6/8. 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.
Tue 6/305:30 am
ORD
- ONT
1 stop7h 10m
Delta
Tue 7/211:00 pm
ONT
- ORD
1 stop6h 29m
Delta
Deal found 6/8![Delta logo]()
$259
This Delta deal was found by Cheapflights users on 6/8. 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.
Tue 6/305:30 am
ORD
- ONT
1 stop7h 10m
Delta
Wed 7/86:20 am
ONT
- ORD
2 stops13h 09m
Delta
Deal found 6/8![Delta logo]()
$264
This Frontier deal was found by Cheapflights users on 6/9. 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 6/307:20 am
ORD
- ONT
1 stop9h 48m
Frontier
Thu 7/23:34 pm
ONT
- ORD
1 stop11h 33m
Frontier
Deal found 6/9![Frontier logo]()
$274
This American Airlines deal was found by Cheapflights users on 6/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/15:00 am
ORD
- ONT
1 stop9h 04m
American Airlines
Tue 8/41:11 pm
ONT
- ORD
1 stop6h 19m
American Airlines
Deal found 6/8![American Airlines logo]()
$268
This Frontier deal was found by Cheapflights users on 6/8. 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 7/49:10 am
ORD
- ONT
1 stop9h 38m
Frontier
Tue 7/213:40 pm
ONT
- ORD
1 stop11h 57m
Frontier
Deal found 6/8![Frontier logo]()
$272
This Expedia deal was found by Cheapflights users on 6/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/89:57 pm
ORD
- ONT
1 stop14h 07m
Frontier
Tue 7/1410:49 am
ONT
- ORD
1 stop8h 03m
Frontier
Deal found 6/5![Frontier logo]()
$240
This Flightnetwork deal was found by Cheapflights users on 6/9. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/99:34 pm
ORD
- ONT
1 stop13h 03m
Frontier
Tue 7/141:38 pm
ONT
- ORD
1 stop13h 59m
Frontier
Deal found 6/9![Frontier logo]()
$275
This United Airlines deal was found by Cheapflights users on 6/8. 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 7/288:18 pm
ORD
- ONT
Nonstop4h 33m
United Airlines
Tue 8/181:18 pm
ONT
- ORD
1 stop6h 11m
United Airlines
Deal found 6/8![United Airlines logo]()
$273
This CheapOair deal was found by Cheapflights users on 6/5. 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.
Wed 7/299:57 pm
ORD
- ONT
1 stop14h 07m
Frontier
Wed 8/55:08 pm
ONT
- ORD
1 stop10h 29m
Frontier
Deal found 6/5![Frontier logo]()
$250
This Frontier deal was found by Cheapflights users on 6/5. 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.
Thu 7/309:34 pm
ORD
- ONT
1 stop13h 03m
Frontier
Thu 8/64:34 pm
ONT
- ORD
1 stop11h 03m
Frontier
Deal found 6/5![Frontier logo]()
$270
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 June 10, 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 June 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1510:40 pm
ORD
- ONT
1 stop17h 17m
Frontier
Deal found 6/5![Frontier logo]()
$101
This Trip.com deal was found by Cheapflights users on 6/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1611:06 am
ORD
- ONT
1 stop14h 49m
Frontier
Deal found 6/5![Frontier logo]()
$114
This Trip.com deal was found by Cheapflights users on 6/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/319:48 pm
ORD
- ONT
1 stop28h 01m
Frontier
Deal found 6/5![Frontier logo]()
$118
This Super.com deal was found by Cheapflights users on 6/10. 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 9/29:33 am
ORD
- ONT
1 stop9h 15m
Frontier
Deal found 6/10![Frontier logo]()
$119
This Super.com deal was found by Cheapflights users on 6/9. 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 8/269:33 am
ORD
- ONT
1 stop9h 15m
Frontier
Deal found 6/9![Frontier logo]()
$121
This Super.com deal was found by Cheapflights users on 6/9. 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 7/149:57 pm
ORD
- ONT
1 stop14h 07m
Frontier
Deal found 6/9![Frontier logo]()
$124
This Super.com deal was found by Cheapflights users on 6/9. 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 6/307:20 am
ORD
- ONT
1 stop14h 31m
Frontier
Deal found 6/9![Frontier logo]()
$125
This Super.com deal was found by Cheapflights users on 6/9. 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 8/109:57 pm
ORD
- ONT
1 stop27h 53m
Frontier
Deal found 6/9![Frontier logo]()
$127
This Booking.com deal was found by Cheapflights users on 6/10. 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.
Thu 8/69:57 pm
ORD
- ONT
1 stop27h 53m
Frontier
Deal found 6/10![Frontier logo]()
$128
This Delta deal was found by Cheapflights users on 6/10. 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.
Tue 7/217:40 pm
ORD
- ONT
1 stop6h 08m
Delta
Deal found 6/10![Delta logo]()
$130
This CheapOair deal was found by Cheapflights users on 6/5. 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.
Wed 7/89:57 pm
ORD
- ONT
1 stop27h 53m
Frontier
Deal found 6/5![Frontier logo]()
$131
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 June 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $240 (Expedia) |
One-way from | $118 (Trip.com) |
Popular in | December |
Cheapest in | January |
Average price | $447 |
Good round-trip deal | $343 or less |
Good one-way deal | $218 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 June 10, 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 - ONT
ORDONT
Chicago O'Hare Intl
Tue 8/25
2:00 pm-10:45 pm
2 stops10h 45m
Ontario
Mon 8/31
6:20 am-8:30 pm
2 stops12h 10m
$330
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Sat 7/11
8:18 pm-10:51 pm
Nonstop4h 33m
Ontario
Sun 7/19
1:50 pm-12:59 am
1 stop9h 09m
$453
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Tue 6/30
6:00 am-12:47 pm
1 stop8h 47m
Ontario
Sun 7/5
6:10 am-12:25 pm
Nonstop4h 15m
$453
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Wed 7/22
6:10 am-12:12 pm
1 stop8h 02m
Ontario
Sun 7/26
6:10 am-12:25 pm
Nonstop4h 15m
$453
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Sat 7/11
8:18 pm-10:51 pm
Nonstop4h 33m
Ontario
Tue 7/14
1:50 pm-10:59 pm
1 stop7h 09m
$453
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Tue 8/4
8:20 pm-11:14 am
1 stop16h 54m
Ontario
Sat 8/8
4:18 pm-5:00 am
2 stops10h 42m
$471
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Mon 7/6
8:18 pm-10:51 pm
Nonstop4h 33m
Ontario
Thu 7/9
1:50 pm-12:59 am
1 stop9h 09m
$492
Quickest round-trip
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Wed 7/22
8:18 pm-10:51 pm
Nonstop4h 33m
Ontario
Tue 7/28
6:10 am-12:25 pm
Nonstop4h 15m
$507
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Wed 7/15
8:18 pm-10:51 pm
Nonstop4h 33m
Ontario
Tue 7/21
1:50 pm-12:59 am
1 stop9h 09m
$513
ChicagoOntario
ORD - ONT
ORDONT
Chicago O'Hare Intl
Sat 7/25
8:18 pm-10:51 pm
Nonstop4h 33m
Ontario
Sat 8/1
6:10 am-12:25 pm
Nonstop4h 15m
$537
Showing 1-10 of 23 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 June.
| 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
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 $385). 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 June 10, 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.
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 June 10, 2026.
See what other customers who have flown with Southwest,Delta, andUnited 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
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Crew
8.6
Boarding
8.1
Food
7.0
Overall
7.9
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
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 June 10, 2026.
O'Hare Intl and Ontario flights
Browse other O'Hare Intl and Ontario flight options. Last updated on June 10, 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 June 10, 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 June 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$127 | Average$259 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$218 | Average$533 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$236 | Average$385 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$307 | Average$524 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$329 | Average$530 | FlexibilityNo cancel fee | On-time69% |