Most accurate provider | FlightHub 3 stars |
---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $110 (Frontier) |
One-way from | $40 (Trip.com) |
Popular in | March |
Cheapest in | February |
Average price | $245 |
Good round-trip deal | $342 or less |
Good one-way deal | $213 or less |
Fly from
Fly to
Route
Depart
Return
Price
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Tue 2/18
12:59 am-9:16 am
1 stop6h 17m
Lambert-St Louis
Sat 2/22
8:52 pm-7:26 am
1 stop12h 34m
OntarioChicago
ONT - MDW
ONTMDW
Ontario
Fri 2/28
12:59 am-12:17 am
1 stop21h 18m
Chicago Midway
Sat 3/15
8:43 pm-7:26 am
1 stop12h 43m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Thu 2/27
12:59 am-12:44 am
1 stop21h 45m
Chicago O'Hare Intl
Tue 3/4
6:50 am-11:59 pm
1 stop19h 09m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Sat 6/21
1:33 pm-12:25 am
1 stop8h 52m
Chicago O'Hare Intl
Tue 6/24
7:55 pm-10:26 pm
Nonstop4h 31m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Fri 2/28
11:25 am-11:59 pm
1 stop10h 34m
Chicago O'Hare Intl
Thu 3/6
6:45 am-12:09 am
1 stop19h 24m
OntarioChicago
ONT - MDW
ONTMDW
Ontario
Fri 3/7
1:10 pm-10:20 pm
1 stop7h 10m
Chicago Midway
Mon 3/10
1:16 pm-11:56 pm
2 stops12h 40m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Thu 3/20
11:42 am-11:53 pm
1 stop10h 11m
Chicago O'Hare Intl
Tue 3/25
4:00 pm-11:56 pm
2 stops9h 56m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Wed 3/5
7:30 pm-5:05 am
1 stop7h 35m
Chicago O'Hare Intl
Sun 3/9
8:20 pm-12:33 am
1 stop6h 13m
OntarioChicago
ONT - MDW
ONTMDW
Ontario
Thu 4/24
9:05 pm-5:20 am
1 stop6h 15m
Chicago Midway
Tue 4/29
8:00 pm-10:15 pm
Nonstop4h 15m
OntarioMoline
ONT - MLI
ONTMLI
Ontario
Tue 2/25
1:05 pm-10:26 pm
1 stop7h 21m
Moline Quad-City
Tue 3/18
5:03 pm-10:43 pm
1 stop7h 40m
Currently, August is the cheapest month in which you can book a flight from Ontario to Illinois (average of $245). Flying from Ontario to Illinois in March is currently the most expensive (average of $323). 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.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Illinois as you normally would.
In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.
If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).
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Arlene,May 2024
SAN - OAK