
Most accurate provider | eDreams 3 stars  | 
|---|---|
Most trusted provider | eDreams 3 stars  | 
Round-trip from | $169 (Kiwi.com)  | 
One-way from | $62 (Trip.com)  | 
Popular in | January | 
Cheapest in | February | 
Average price | $487 | 
Good round-trip deal | $405 or less | 
Good one-way deal | $218 or less | 
Fly from
Fly to
Route
Depart
Return
Price
OntarioChicago
ONT - ORD
ONTORD
Ontario
Sat 1/24
11:53 am-11:50 pm
1 stop9h 57m
Chicago O'Hare Intl
Sat 1/31
8:00 am-3:08 pm
1 stop9h 08m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Sun 12/14
7:10 am-1:09 pm
1 stop27h 59m
Chicago O'Hare Intl
Sun 1/18
8:00 am-5:03 pm
2 stops11h 03m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Mon 11/24
7:00 am-5:01 am
1 stop20h 01m
Chicago O'Hare Intl
Wed 12/10
2:05 pm-8:03 pm
1 stop7h 58m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Tue 12/2
7:10 am-1:09 pm
1 stop27h 59m
Chicago O'Hare Intl
Tue 1/6
6:08 pm-3:08 pm
1 stop23h 00m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Wed 12/24
4:36 pm-12:13 pm
1 stop17h 37m
Chicago O'Hare Intl
Wed 12/31
7:00 am-11:59 pm
1 stop18h 59m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Tue 12/2
6:00 am-4:55 pm
1 stop8h 55m
Chicago O'Hare Intl
Tue 12/9
10:00 am-6:33 pm
1 stop10h 33m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Wed 12/24
4:36 pm-5:02 am
2 stops34h 26m
Chicago O'Hare Intl
Sun 1/4
7:00 am-5:11 pm
1 stop12h 11m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Thu 12/11
12:13 pm-10:30 pm
1 stop8h 17m
Chicago O'Hare Intl
Tue 12/16
10:00 am-6:33 pm
1 stop10h 33m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Tue 12/23
6:04 am-5:05 pm
1 stop9h 01m
Chicago O'Hare Intl
Sat 12/27
7:55 pm-10:25 pm
Nonstop4h 30m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Thu 12/18
11:59 pm-5:50 am
Nonstop3h 51m
Chicago O'Hare Intl
Sat 12/20
7:55 pm-10:25 pm
Nonstop4h 30m
| Provider | Price Accuracy | Trust Score* | 
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star | 
The price you pay for your flight from Ontario to Chicago O'Hare Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 51 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Currently, March is the cheapest month in which you can book a flight from Ontario to Chicago O'Hare Intl Airport (average of $77). Flying from Ontario to Chicago O'Hare Intl Airport in November is currently the most expensive (average of $141). 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.
It’s typically best to fly out from Ontario to Chicago O'Hare Intl Airport in the afternoon. Doing so could potentially save you 52% on the flight price compared to flying in the evening, which is usually more expensive.
Travelers seeking maximum savings on their Ontario to Chicago O'Hare Intl Airport flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Walter,Aug 2025
OAK - SAN
| Airline | Cheapest | Average | Flexibility | On-time | 
|---|---|---|---|---|
| Cheapest$110 | Average$214 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$227 | Average$393 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$246 | Average$474 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$246 | Average$440 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$256 | Average$357 | FlexibilityNo cancel fee | On-timeN/A |