Cheap Flights from Ontario, CA to Chicago, IL from $81
On Cheapflightsplus.com you will find 3 direct and 189 connecting flights from Ontario to Chicago. You can compare airfare deals from 4 airlines and multiple travel sites from $81, book and save on cheap plane tickets and last minute offers. Also check out ONT-CHI flight schedule to find best flight time, convenient departure and arrival airports.
Find One-Way and Round-Trip Ontario to Chicago Flight Deals
Best Flights from Ontario to Chicago Today
Price | Departure | Arrival | Flight Duration | Airline | Flight |
---|---|---|---|---|---|
from $125 | 07:00 Ontario Ontario Int. | 13:02 Chicago O'Hare International | 4h 2m | United Airlines | UA356 |
from $328 | 07:00 Ontario Ontario Int. | 13:03 Chicago O'Hare International | 4h 3m | United Airlines | UA2649 |
from $81 | 12:48 Ontario Ontario Int. | 22:18 Chicago Midway | 7h 30m layover 1h 27m - Houston | Frontier Airlines | F93132 F93282 |
from $85 | 06:00 Ontario Ontario Int. | 20:56 Chicago O'Hare International | 12h 56m layover 7h 50m - Las Vegas | Frontier Airlines | F92232 F92146 |
from $85 | 17:21 Ontario Ontario Int. | 00:10+2 дня Chicago O'Hare International | 28h 49m layover 23h 47m - Denver | Frontier Airlines | F92908 F93172 |
from $93 | 13:31 Ontario Ontario Int. | 23:59 Chicago O'Hare International | 8h 28m layover 1h 36m - Seattle | Hawaiian Airlines | HA6289 HA6819 |
from $94 | 00:59 Ontario Ontario Int. | 23:53 Chicago O'Hare International | 20h 54m layover 16h 2m - Denver | Frontier Airlines | F91500 F93172 |
from $99 | 06:00 Ontario Ontario Int. | 14:56 Chicago Midway | 6h 56m layover 2h 9m - Las Vegas | Frontier Airlines | F92232 F92330 |
from $99 | 13:31 Ontario Ontario Int. | 23:59 Chicago O'Hare International | 8h 28m layover 1h 36m - Seattle | Alaska Airlines | AS1111 AS538 |
from $100 | 11:39 Ontario Ontario Int. | 22:04 Chicago O'Hare International | 8h 25m layover 1h 40m - Seattle | Alaska Airlines | AS1111 AS941 |
from $105 | 20:09 Ontario Ontario Int. | 11:37+1 день Chicago O'Hare International | 13h 28m layover 7h 30m - Dallas | Frontier Airlines | F92924 F91342 |
from $105 | 17:21 Ontario Ontario Int. | 11:41+1 день Chicago Midway | 16h 20m layover 11h 31m - Denver | Frontier Airlines | F92908 F92210 |
from $105 | 17:14 Ontario Ontario Int. | 21:06+1 день Chicago O'Hare International | 25h 52m layover 20h 32m - Las Vegas | Frontier Airlines | F91358 F92146 |
from $105 | 17:21 Ontario Ontario Int. | 00:10+2 дня Chicago O'Hare International | 28h 49m layover 23h 49m - Denver | Frontier Airlines | F92908 F93174 |
from $131 | 07:10 Ontario Ontario Int. | 22:04 Chicago O'Hare International | 12h 54m layover 3h 57m - Portland 1h 33m - Seattle | Hawaiian Airlines | HA6286 HA6397 HA6821 |
from $141 | 07:10 Ontario Ontario Int. | 22:04 Chicago O'Hare International | 12h 54m layover 3h 57m - Portland 1h 33m - Seattle | Alaska Airlines | AS1058 AS1016 AS941 |
Flight Schedule Ontario (California) to Chicago (Illinois)
Departure | Arrival | Flight Details | Flight Duration | Price |
---|---|---|---|---|
07:00 — 13:02
|
07:00 — 13:02
UA356
United Airlines
Ontario — Chicago
|
4h 2m |
Find flight
from$125 |
|
07:00 — 13:03
|
07:00 — 13:03
UA2226
United Airlines
Ontario — Chicago
|
4h 3m |
Find flight
from$129 |
|
07:00 — 13:03
|
07:00 — 13:03
UA2649
United Airlines
Ontario — Chicago
|
4h 3m |
Find flight
from$328 |
|
00:59 — 11:40
|
00:59 — 04:19
F91500
Frontier Airlines
Ontario — Denver
3h 57m stop
08:15 — 11:41
F92210
Frontier Airlines
Denver — Chicago
|
8h 41m including layover |
Find flight
from$81 |
|
00:59 — 23:59
|
00:59 — 04:19
F91500
Frontier Airlines
Ontario — Denver
16h 3m stop
20:31 — 00:10
F93174
Frontier Airlines
Denver — Chicago
|
21h including layover |
Find flight
from$85 |
|
05:05 — 13:20
|
05:05 — 08:23
UA1575
United Airlines
Ontario — Denver
1h 17m stop
09:40 — 13:20
UA2329
United Airlines
Denver — Chicago
|
6h 15m including layover |
Find flight
from$132 |
|
05:05 — 15:05
|
05:05 — 08:23
UA1575
United Airlines
Ontario — Denver
3h 2m stop
11:25 — 15:05
UA2865
United Airlines
Denver — Chicago
|
8h including layover |
Find flight
from$134 |
|
06:00 — 20:56
|
06:00 — 07:13
F92232
Frontier Airlines
Ontario — Las Vegas
7h 50m stop
15:00 — 21:06
F92146
Frontier Airlines
Las Vegas — Chicago
|
12h 56m including layover |
Find flight
from$85 |
|
06:00 — 14:56
|
06:00 — 07:10
F92232
Frontier Airlines
Ontario — Las Vegas
2h 9m stop
09:19 — 14:56
F92330
Frontier Airlines
Las Vegas — Chicago
|
6h 56m including layover |
Find flight
from$99 |
|
10:03 — 23:39
|
10:03 — 12:19
HA6284
Hawaiian Airlines
Ontario — Portland
5h 16m stop
17:35 — 23:39
HA6374
Hawaiian Airlines
Portland — Chicago
|
11h 36m including layover |
Find flight
from$174 |
|
11:39 — 22:04
|
12:00 — 14:38
HA6289
Hawaiian Airlines
Ontario — Seattle
1h 40m stop
16:25 — 22:30
HA6821
Hawaiian Airlines
Seattle — Chicago
|
8h 25m including layover |
Find flight
from$94 |
|
11:39 — 22:04
|
12:00 — 14:38
AS1111
Alaska Airlines
Ontario — Seattle
1h 40m stop
16:25 — 22:30
AS941
Alaska Airlines
Seattle — Chicago
|
8h 25m including layover |
Find flight
from$100 |
|
12:48 — 22:18
|
12:48 — 18:19
F93132
Frontier Airlines
Ontario — Houston
1h 27m stop
19:45 — 22:23
F93282
Frontier Airlines
Houston — Chicago
|
7h 30m including layover |
Find flight
from$81 |
|
13:31 — 23:59
|
12:00 — 14:38
HA6289
Hawaiian Airlines
Ontario — Seattle
1h 36m stop
17:54 — 23:59
HA6819
Hawaiian Airlines
Seattle — Chicago
|
8h 28m including layover |
Find flight
from$93 |
|
13:31 — 23:59
|
12:00 — 14:38
AS1111
Alaska Airlines
Ontario — Seattle
1h 36m stop
17:54 — 23:59
AS538
Alaska Airlines
Seattle — Chicago
|
8h 28m including layover |
Find flight
from$99 |
|
14:21 — 23:59
|
14:21 — 16:58
HA6307
Hawaiian Airlines
Ontario — Seattle
56m stop
17:54 — 23:59
HA6819
Hawaiian Airlines
Seattle — Chicago
|
7h 38m including layover |
Find flight
from$111 |
|
14:21 — 23:59
|
14:21 — 16:58
AS1242
Alaska Airlines
Ontario — Seattle
56m stop
17:54 — 23:59
AS538
Alaska Airlines
Seattle — Chicago
|
7h 38m including layover |
Find flight
from$117 |
|
16:00 — 12:07
+1 day
|
13:53 — 16:46
AS1119
Alaska Airlines
Ontario — Seattle
11h 20m stop
06:00 — 12:07
AS408
Alaska Airlines
Seattle — Chicago
|
18h 7m including layover |
Find flight
from$150 |
|
16:00 — 05:40
+1 day
|
16:00 — 18:40
AS1119
Alaska Airlines
Ontario — Seattle
5h stop
23:40 — 05:40
AS328
Alaska Airlines
Seattle — Chicago
|
11h 40m including layover |
Find flight
from$174 |
|
17:14 — 21:06
+1 day
|
17:14 — 18:28
F91358
Frontier Airlines
Ontario — Las Vegas
20h 32m stop
15:00 — 21:06
F92146
Frontier Airlines
Las Vegas — Chicago
|
25h 52m including layover |
Find flight
from$105 |
|
17:21 — 00:10
+2 days
|
17:21 — 20:44
F92908
Frontier Airlines
Ontario — Denver
23h 47m stop
20:31 — 00:10
F93172
Frontier Airlines
Denver — Chicago
|
28h 49m including layover |
Find flight
from$85 |
|
18:58 — 05:40
+1 day
|
18:58 — 21:37
HA6287
Hawaiian Airlines
Ontario — Seattle
2h 3m stop
23:40 — 05:40
HA6815
Hawaiian Airlines
Seattle — Chicago
|
8h 42m including layover |
Find flight
from$111 |
|
18:58 — 05:40
+1 day
|
18:58 — 21:37
AS1087
Alaska Airlines
Ontario — Seattle
2h 3m stop
23:40 — 05:40
AS328
Alaska Airlines
Seattle — Chicago
|
8h 42m including layover |
Find flight
from$117 |
|
19:22 — 07:03
+1 day
|
19:22 — 22:05
HA6287
Hawaiian Airlines
Ontario — Seattle
2h 54m stop
00:59 — 07:03
HA6669
Hawaiian Airlines
Seattle — Chicago
|
9h 41m including layover |
Find flight
from$131 |
|
19:25 — 06:21
+1 day
|
19:25 — 22:05
HA6287
Hawaiian Airlines
Ontario — Seattle
2h 12m stop
00:17 — 06:21
HA6538
Hawaiian Airlines
Seattle — Chicago
|
8h 56m including layover |
Find flight
from$146 |
|
20:09 — 11:37
+1 day
|
20:09 — 01:24
F92924
Frontier Airlines
Ontario — Dallas
7h 30m stop
08:54 — 11:37
F91342
Frontier Airlines
Dallas — Chicago
|
13h 28m including layover |
Find flight
from$105 |
Flight Information
Below we will explain in detail what the flights cost on the destination from Ontario to Chicago depends on and how to choose the most interesting flight option for you.
Distance between Ontario and Chicago is 2751 miles. Time difference between the cities is 2h. Airplanes depart 00:59 to 20:09 from 2 Ontario airports and arrive 00:59 to 20:09 to 7 Chicago airports. Average flight time is 4h 3m.
- The fastest flight 4h 2m
- Average flight time 4h 3m
- The earliest flight 00:59
- The latest flight 20:09
- Distance 1710 ml
The cheapest months to travel to Chicago are july (from 108 $), october (from 125 $), september (from 126 $).
The most expensive months are february (from 346 $), december (from 279 $), august (from 140 $).
What is the lowest airfare Ontario to Chicago?
The cheapest plane ticket found by our users is $81. This airfare is for economy class on one-way F93132 flight by Frontier Airlines for July 14, 2025 which leaves Ontario Int. in Ontario at 12:48 am and arrives at Chicago Midway at 22:18.
Popular Airlines on the Route
The flight Ontario — Chicago is served by 4 regular airlines and 1 low-cost airline. Most of the flights on this route are operated by Alaska Airlines - 45 departures per week at the price of from $ 99 . And the most expensive tickets are offered by Alaska Airlines airline - from $ 5526.
Direct flights
There are 3 nonstop flights on the route. The fastest direct flight is UA356 by United Airlines takes 4h 2m and the cheapest is F93132 by Frontier Airlines for $125.
- UA - United Airlinesfrom $125Find
Connecting Flights
There are 189 flights with layovers on the route. The fastest connecting flight is UA2446 by United Airlines takes 6h 2m and the cheapest is F93132 by Frontier Airlines for $81.
- AS - Alaska Airlinesfrom $99Find
- F9 - Frontier Airlinesfrom $81Find
- HA - Hawaiian Airlinesfrom $93Find
- UA - United Airlinesfrom $132Find
Airports
You can fly from Ontario to Chicago from 2 airports (Ontario Int., International Heliport).
Ontario airports
- Ontario Int.-ONTfrom $81Find
- International Heliport-JIOFind
Chicago airports
- O'Hare International-ORDFind
- Midway-MDWFind
- Dupage County-DPAFind
- Chicago FSS-CHIFind
- Merrill C Meigs (closed)-CGXFind
- Pal-Waukee-PWKFind
- Chicago NAS-NOHFind
Airplanes
There are flights to Chicago from Ontario by 4 airlines that use 0 aircraft brands. They range from huge modern airplanes to small-sized.
Top Domestic Destinations from Ontario
You may also consider searching for discounted plane tickets to some other popular places from Ontario within United States.
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Top International Destinations from Ontario
Our state-of-the art metasearch will definitely provide you with the best airfare on international flights. We’re proud to partner with many reliable travel suppliers located outside the US what gives us an opportunity to offer the most competitive prices on far destinations.
- from $62Find
- from $61Find
- from $70Find
- from $74Find
How to book a plane ticket yourself?

- Fill in the search parameters — cities of departure and destination, departure and return dates and click «Find flights»
- Select the best flight that you like. Please, check the airports of departure and arrival. Select the best fare, but pay attention to the following flight details - airports of departure and arrival, flight duration and layovers. Please use filters and sort to find the best flight.
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- Fill in all passenger and payment information — passport and contact information, please double check all passengers’ names and make a payment for your itinerary.
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