
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $125 (Frontier) |
One-way from | $62 (Trip.com) |
Popular in | December |
Cheapest in | September |
Average price | $269 |
Good round-trip deal | $434 or less |
Good one-way deal | $183 or less |
Fly from
Fly to
Route
Depart
Return
Price
St. LouisOntario
STL - ONT
STLONT
Lambert-St Louis
mié. 11/12
7:45 pm-11:10 am
1 stop17h 25m
Ontario
mié. 11/19
12:58 am-6:58 pm
1 stop16h 00m
St. LouisOntario
STL - ONT
STLONT
Lambert-St Louis
lun. 11/10
9:07 pm-8:42 pm
1 stop25h 35m
Ontario
lun. 11/17
6:00 am-8:12 pm
1 stop12h 12m
St. LouisOntario
STL - ONT
STLONT
Lambert-St Louis
vie. 11/7
9:07 pm-8:42 pm
1 stop25h 35m
Ontario
lun. 11/10
4:05 pm-9:07 am
1 stop15h 02m
ChicagoOntario
MDW - ONT
MDWONT
Chicago Midway
lun. 11/3
6:30 am-6:49 pm
1 stop14h 19m
Ontario
mié. 11/5
8:45 am-11:30 am
1 stop24h 45m
ChicagoOntario
MDW - ONT
MDWONT
Chicago Midway
jue. 11/6
6:30 am-6:49 pm
1 stop14h 19m
Ontario
dom. 11/9
6:45 am-11:30 am
1 stop26h 45m
St. LouisOntario
STL - ONT
STLONT
Lambert-St Louis
vie. 11/14
9:07 pm-8:42 pm
1 stop25h 35m
Ontario
dom. 11/16
7:44 pm-8:12 pm
1 stop22h 28m
ChicagoOntario
MDW - ONT
MDWONT
Chicago Midway
vie. 11/7
12:30 pm-11:10 am
1 stop24h 40m
Ontario
dom. 11/9
6:45 am-11:30 am
1 stop26h 45m
ChicagoOntario
MDW - ONT
MDWONT
Chicago Midway
lun. 11/10
12:30 pm-9:57 pm
2 stops11h 27m
Ontario
vie. 11/14
1:46 pm-12:37 pm
1 stop20h 51m
ChicagoOntario
MDW - ONT
MDWONT
Chicago Midway
jue. 11/6
12:30 pm-11:10 am
1 stop24h 40m
Ontario
lun. 11/10
8:24 am-5:15 pm
1 stop6h 51m
St. LouisOntario
STL - ONT
STLONT
Lambert-St Louis
mié. 12/31
7:43 pm-11:59 pm
1 stop6h 16m
Ontario
lun. 1/5
6:45 am-10:02 am
1 stop25h 17m
Currently, September is the cheapest month in which you can book a flight from Illinois to Ontario (average of $80). Flying from Illinois to Ontario in December is currently the most expensive (average of $151). 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 Illinois to Ontario in the evening. Doing so could potentially save you 30% on the flight price compared to flying in the morning, which is usually more expensive.
Travelers seeking maximum savings on their Illinois to Ontario flight should consider departing on Saturday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$125 | Average$220 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$231 | Average$583 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$237 | Average$443 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$256 | Average$462 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$256 | Average$280 | FlexibilityNo cancel fee | On-timeN/A |