Round-trip from | $118 (Kiwi.com) |
---|---|
One-way from | $54 (Trip.com) |
Popular in | December |
Cheapest in | February |
Average price | $268 |
Good round-trip deal | $330 or less |
Good one-way deal | $196 or less |
Fly from
Fly to
Route
Depart
Return
Price
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Sat 9/27
8:59 pm-9:06 am
1 stop10h 07m
Lambert-St Louis
Mon 9/29
7:55 pm-7:54 pm
1 stop25h 59m
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Thu 10/30
7:44 pm-8:12 pm
1 stop22h 28m
Lambert-St Louis
Sun 11/2
7:45 pm-11:10 am
1 stop17h 25m
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Mon 11/3
4:05 pm-9:07 am
1 stop15h 02m
Lambert-St Louis
Tue 11/4
7:45 pm-11:50 pm
1 stop6h 05m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Tue 10/21
7:02 am-1:05 pm
Nonstop4h 03m
Chicago O'Hare Intl
Wed 10/22
7:59 pm-10:30 pm
Nonstop4h 31m
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Fri 10/24
10:47 pm-9:07 am
2 stops8h 20m
Lambert-St Louis
Fri 10/31
8:40 pm-11:10 am
1 stop16h 30m
OntarioChicago
ONT - MDW
ONTMDW
Ontario
Sat 10/11
8:34 am-11:20 pm
1 stop12h 46m
Chicago Midway
Sun 10/19
10:30 am-5:49 pm
1 stop9h 19m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Sat 10/18
7:02 am-1:05 pm
Nonstop4h 03m
Chicago O'Hare Intl
Mon 10/20
7:59 pm-10:30 pm
Nonstop4h 31m
OntarioChicago
ONT - ORD
ONTORD
Ontario
Fri 10/17
12:32 pm-12:44 am
1 stop10h 12m
Chicago O'Hare Intl
Sun 10/19
9:54 pm-7:47 am
1 stop11h 53m
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Wed 10/15
6:53 am-9:07 am
1 stop24h 14m
Lambert-St Louis
Sat 10/18
4:51 pm-8:42 pm
1 stop5h 51m
OntarioSt. Louis
ONT - STL
ONTSTL
Ontario
Sat 10/11
8:00 am-3:56 pm
1 stop5h 56m
Lambert-St Louis
Sat 10/18
4:51 pm-8:42 pm
1 stop5h 51m
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 $321). 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.
Boarding
Overall
Entertainment
Food
Crew
Comfort
Reviews
Walter,Aug 2025
OAK - SAN
Boarding
Overall
Entertainment
Food
Crew
Comfort
Reviews
Walter,Aug 2025
OAK - SAN
Boarding
Overall
Entertainment
Food
Crew
Comfort
Reviews
Walter,Aug 2025
OAK - SAN
Boarding
Overall
Entertainment
Food
Crew
Comfort
Reviews
Walter,Aug 2025
OAK - SAN
Boarding
Overall
Entertainment
Food
Crew
Comfort
Reviews
Walter,Aug 2025
OAK - SAN
Boarding
Overall
Entertainment
Food
Crew
Comfort
Reviews
Walter,Aug 2025
OAK - SAN
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
Cheapest$99 | Average$145 | FlexibilityNo cancel fee | On-time65% | |
Cheapest$108 | Average$180 | FlexibilityNo cancel fee | On-time62% | |
Cheapest$227 | Average$488 | FlexibilityNo cancel fee | On-time69% | |
Cheapest$237 | Average$434 | FlexibilityNo cancel fee | On-time63% | |
Cheapest$241 | Average$411 | FlexibilityNo cancel fee | On-timeN/A | |
Cheapest$246 | Average$507 | FlexibilityNo cancel fee | On-time71% |